diff --git a/client_test.go b/client_test.go
index 3cd4957..b15fd81 100644
--- a/client_test.go
+++ b/client_test.go
@@ -16,8 +16,6 @@ import (
 	"github.com/hibiken/asynq/internal/base"
 )
 
-var ctx = context.Background()
-
 func TestClientEnqueueWithProcessAtOption(t *testing.T) {
 	r := setup(t)
 	client := NewClient(getRedisConnOpt(t))
@@ -754,7 +752,7 @@ func TestClientEnqueueUnique(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(ctx, base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
 		if !cmp.Equal(tc.ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, tc.ttl)
 			continue
@@ -799,7 +797,7 @@ func TestClientEnqueueUniqueWithProcessInOption(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(ctx, base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
 		wantTTL := time.Duration(tc.ttl.Seconds()+tc.d.Seconds()) * time.Second
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)
@@ -845,7 +843,7 @@ func TestClientEnqueueUniqueWithProcessAtOption(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(ctx, base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
 		wantTTL := tc.at.Add(tc.ttl).Sub(time.Now())
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)
diff --git a/inspector_test.go b/inspector_test.go
index 53d59b3..89be4b4 100644
--- a/inspector_test.go
+++ b/inspector_test.go
@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"math"
@@ -37,7 +38,7 @@ func TestInspectorQueues(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)
 		for _, qname := range tc.queues {
-			if err := r.SAdd(ctx, base.AllQueues, qname).Err(); err != nil {
+			if err := r.SAdd(context.Background(), base.AllQueues, qname).Err(); err != nil {
 				t.Fatalf("could not initialize all queue set: %v", err)
 			}
 		}
@@ -136,7 +137,7 @@ func TestInspectorDeleteQueue(t *testing.T) {
 				tc.qname, tc.force, err)
 			continue
 		}
-		if r.SIsMember(ctx, base.AllQueues, tc.qname).Val() {
+		if r.SIsMember(context.Background(), base.AllQueues, tc.qname).Val() {
 			t.Errorf("%q is a member of %q", tc.qname, base.AllQueues)
 		}
 	}
@@ -345,11 +346,11 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 		h.SeedAllArchivedQueues(t, r, tc.archived)
 		for qname, n := range tc.processed {
 			processedKey := base.ProcessedKey(qname, now)
-			r.Set(ctx, processedKey, n, 0)
+			r.Set(context.Background(), processedKey, n, 0)
 		}
 		for qname, n := range tc.failed {
 			failedKey := base.FailedKey(qname, now)
-			r.Set(ctx, failedKey, n, 0)
+			r.Set(context.Background(), failedKey, n, 0)
 		}
 
 		got, err := inspector.GetQueueInfo(tc.qname)
@@ -385,14 +386,14 @@ func TestInspectorHistory(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)
 
-		r.SAdd(ctx, base.AllQueues, tc.qname)
+		r.SAdd(context.Background(), base.AllQueues, tc.qname)
 		// populate last n days data
 		for i := 0; i < tc.n; i++ {
 			ts := now.Add(-time.Duration(i) * 24 * time.Hour)
 			processedKey := base.ProcessedKey(tc.qname, ts)
 			failedKey := base.FailedKey(tc.qname, ts)
-			r.Set(ctx, processedKey, (i+1)*1000, 0)
-			r.Set(ctx, failedKey, (i+1)*10, 0)
+			r.Set(context.Background(), processedKey, (i+1)*1000, 0)
+			r.Set(context.Background(), failedKey, (i+1)*10, 0)
 		}
 
 		got, err := inspector.History(tc.qname, tc.n)
diff --git a/internal/asynqtest/asynqtest.go b/internal/asynqtest/asynqtest.go
index b9ded2b..9421e75 100644
--- a/internal/asynqtest/asynqtest.go
+++ b/internal/asynqtest/asynqtest.go
@@ -20,8 +20,6 @@ import (
 	"github.com/hibiken/asynq/internal/base"
 )
 
-var ctx = context.Background()
-
 // EquateInt64Approx returns a Comparer option that treats int64 values
 // to be equal if they are within the given margin.
 func EquateInt64Approx(margin int64) cmp.Option {
@@ -168,11 +166,11 @@ func FlushDB(tb testing.TB, r redis.UniversalClient) {
 	tb.Helper()
 	switch r := r.(type) {
 	case *redis.Client:
-		if err := r.FlushDB(ctx).Err(); err != nil {
+		if err := r.FlushDB(context.Background()).Err(); err != nil {
 			tb.Fatal(err)
 		}
 	case *redis.ClusterClient:
-		err := r.ForEachMaster(ctx, func(ctx2 context.Context, c *redis.Client) error {
+		err := r.ForEachMaster(context.Background(), func(ctx2 context.Context, c *redis.Client) error {
 			if err := c.FlushAll(ctx2).Err(); err != nil {
 				return err
 			}
@@ -187,42 +185,42 @@ func FlushDB(tb testing.TB, r redis.UniversalClient) {
 // SeedPendingQueue initializes the specified queue with the given messages.
 func SeedPendingQueue(tb testing.TB, r redis.UniversalClient, msgs []*base.TaskMessage, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisList(tb, r, base.PendingKey(qname), msgs, base.TaskStatePending)
 }
 
 // SeedActiveQueue initializes the active queue with the given messages.
 func SeedActiveQueue(tb testing.TB, r redis.UniversalClient, msgs []*base.TaskMessage, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisList(tb, r, base.ActiveKey(qname), msgs, base.TaskStateActive)
 }
 
 // SeedScheduledQueue initializes the scheduled queue with the given messages.
 func SeedScheduledQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.ScheduledKey(qname), entries, base.TaskStateScheduled)
 }
 
 // SeedRetryQueue initializes the retry queue with the given messages.
 func SeedRetryQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.RetryKey(qname), entries, base.TaskStateRetry)
 }
 
 // SeedArchivedQueue initializes the archived queue with the given messages.
 func SeedArchivedQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.ArchivedKey(qname), entries, base.TaskStateArchived)
 }
 
 // SeedDeadlines initializes the deadlines set with the given entries.
 func SeedDeadlines(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.DeadlinesKey(qname), entries, base.TaskStateActive)
 }
 
@@ -281,7 +279,7 @@ func seedRedisList(tb testing.TB, c redis.UniversalClient, key string,
 	tb.Helper()
 	for _, msg := range msgs {
 		encoded := MustMarshal(tb, msg)
-		if err := c.LPush(ctx, key, msg.ID.String()).Err(); err != nil {
+		if err := c.LPush(context.Background(), key, msg.ID.String()).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		key := base.TaskKey(msg.Queue, msg.ID.String())
@@ -292,11 +290,11 @@ func seedRedisList(tb testing.TB, c redis.UniversalClient, key string,
 			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
 		}
-		if err := c.HSet(ctx, key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), key, data).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		if len(msg.UniqueKey) > 0 {
-			err := c.SetNX(ctx, msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
+			err := c.SetNX(context.Background(), msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
 			if err != nil {
 				tb.Fatalf("Failed to set unique lock in redis: %v", err)
 			}
@@ -311,7 +309,7 @@ func seedRedisZSet(tb testing.TB, c redis.UniversalClient, key string,
 		msg := item.Message
 		encoded := MustMarshal(tb, msg)
 		z := &redis.Z{Member: msg.ID.String(), Score: float64(item.Score)}
-		if err := c.ZAdd(ctx, key, z).Err(); err != nil {
+		if err := c.ZAdd(context.Background(), key, z).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		key := base.TaskKey(msg.Queue, msg.ID.String())
@@ -322,11 +320,11 @@ func seedRedisZSet(tb testing.TB, c redis.UniversalClient, key string,
 			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
 		}
-		if err := c.HSet(ctx, key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), key, data).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		if len(msg.UniqueKey) > 0 {
-			err := c.SetNX(ctx, msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
+			err := c.SetNX(context.Background(), msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
 			if err != nil {
 				tb.Fatalf("Failed to set unique lock in redis: %v", err)
 			}
@@ -401,13 +399,13 @@ func GetDeadlinesEntries(tb testing.TB, r redis.UniversalClient, qname string) [
 func getMessagesFromList(tb testing.TB, r redis.UniversalClient, qname string,
 	keyFn func(qname string) string, state base.TaskState) []*base.TaskMessage {
 	tb.Helper()
-	ids := r.LRange(ctx, keyFn(qname), 0, -1).Val()
+	ids := r.LRange(context.Background(), keyFn(qname), 0, -1).Val()
 	var msgs []*base.TaskMessage
 	for _, id := range ids {
 		taskKey := base.TaskKey(qname, id)
-		data := r.HGet(ctx, taskKey, "msg").Val()
+		data := r.HGet(context.Background(), taskKey, "msg").Val()
 		msgs = append(msgs, MustUnmarshal(tb, data))
-		if gotState := r.HGet(ctx, taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", id, gotState, state)
 		}
 	}
@@ -418,13 +416,13 @@ func getMessagesFromList(tb testing.TB, r redis.UniversalClient, qname string,
 func getMessagesFromZSet(tb testing.TB, r redis.UniversalClient, qname string,
 	keyFn func(qname string) string, state base.TaskState) []*base.TaskMessage {
 	tb.Helper()
-	ids := r.ZRange(ctx, keyFn(qname), 0, -1).Val()
+	ids := r.ZRange(context.Background(), keyFn(qname), 0, -1).Val()
 	var msgs []*base.TaskMessage
 	for _, id := range ids {
 		taskKey := base.TaskKey(qname, id)
-		msg := r.HGet(ctx, taskKey, "msg").Val()
+		msg := r.HGet(context.Background(), taskKey, "msg").Val()
 		msgs = append(msgs, MustUnmarshal(tb, msg))
-		if gotState := r.HGet(ctx, taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", id, gotState, state)
 		}
 	}
@@ -435,14 +433,14 @@ func getMessagesFromZSet(tb testing.TB, r redis.UniversalClient, qname string,
 func getMessagesFromZSetWithScores(tb testing.TB, r redis.UniversalClient,
 	qname string, keyFn func(qname string) string, state base.TaskState) []base.Z {
 	tb.Helper()
-	zs := r.ZRangeWithScores(ctx, keyFn(qname), 0, -1).Val()
+	zs := r.ZRangeWithScores(context.Background(), keyFn(qname), 0, -1).Val()
 	var res []base.Z
 	for _, z := range zs {
 		taskID := z.Member.(string)
 		taskKey := base.TaskKey(qname, taskID)
-		msg := r.HGet(ctx, taskKey, "msg").Val()
+		msg := r.HGet(context.Background(), taskKey, "msg").Val()
 		res = append(res, base.Z{Message: MustUnmarshal(tb, msg), Score: int64(z.Score)})
-		if gotState := r.HGet(ctx, taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", taskID, gotState, state)
 		}
 	}
diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index 562489d..78bd6e9 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -5,6 +5,7 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -18,7 +19,7 @@ import (
 
 // AllQueues returns a list of all queue names.
 func (r *RDB) AllQueues() ([]string, error) {
-	return r.client.SMembers(ctx, base.AllQueues).Result()
+	return r.client.SMembers(context.Background(), base.AllQueues).Result()
 }
 
 // Stats represents a state of queues at a certain time.
@@ -102,7 +103,7 @@ return res`)
 // CurrentStats returns a current state of the queues.
 func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 	var op errors.Op = "rdb.CurrentStats"
-	exists, err := r.client.SIsMember(ctx, base.AllQueues, qname).Result()
+	exists, err := r.client.SIsMember(context.Background(), base.AllQueues, qname).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -110,7 +111,7 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	now := time.Now()
-	res, err := currentStatsCmd.Run(ctx, r.client, []string{
+	res, err := currentStatsCmd.Run(context.Background(), r.client, []string{
 		base.PendingKey(qname),
 		base.ActiveKey(qname),
 		base.ScheduledKey(qname),
@@ -181,7 +182,7 @@ func (r *RDB) memoryUsage(qname string) (int64, error) {
 		err    error
 	)
 	for {
-		data, cursor, err = r.client.Scan(ctx, cursor, fmt.Sprintf("asynq:{%s}*", qname), 100).Result()
+		data, cursor, err = r.client.Scan(context.Background(), cursor, fmt.Sprintf("asynq:{%s}*", qname), 100).Result()
 		if err != nil {
 			return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "scan", Err: err})
 		}
@@ -192,7 +193,7 @@ func (r *RDB) memoryUsage(qname string) (int64, error) {
 	}
 	var usg int64
 	for _, k := range keys {
-		n, err := r.client.MemoryUsage(ctx, k).Result()
+		n, err := r.client.MemoryUsage(context.Background(), k).Result()
 		if err != nil {
 			return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "memory usage", Err: err})
 		}
@@ -218,7 +219,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 	if n < 1 {
 		return nil, errors.E(op, errors.FailedPrecondition, "the number of days must be positive")
 	}
-	exists, err := r.client.SIsMember(ctx, base.AllQueues, qname).Result()
+	exists, err := r.client.SIsMember(context.Background(), base.AllQueues, qname).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
 	}
@@ -235,7 +236,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 		keys = append(keys, base.ProcessedKey(qname, ts))
 		keys = append(keys, base.FailedKey(qname, ts))
 	}
-	res, err := historicalStatsCmd.Run(ctx, r.client, keys).Result()
+	res, err := historicalStatsCmd.Run(context.Background(), r.client, keys).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -257,7 +258,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 
 // RedisInfo returns a map of redis info.
 func (r *RDB) RedisInfo() (map[string]string, error) {
-	res, err := r.client.Info(ctx).Result()
+	res, err := r.client.Info(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -266,7 +267,7 @@ func (r *RDB) RedisInfo() (map[string]string, error) {
 
 // RedisClusterInfo returns a map of redis cluster info.
 func (r *RDB) RedisClusterInfo() (map[string]string, error) {
-	res, err := r.client.ClusterInfo(ctx).Result()
+	res, err := r.client.ClusterInfo(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -295,7 +296,7 @@ func reverse(x []string) {
 // checkQueueExists verifies whether the queue exists.
 // It returns QueueNotFoundError if queue doesn't exist.
 func (r *RDB) checkQueueExists(qname string) error {
-	exists, err := r.client.SIsMember(ctx, base.AllQueues, qname).Result()
+	exists, err := r.client.SIsMember(context.Background(), base.AllQueues, qname).Result()
 	if err != nil {
 		return errors.E(errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
 	}
@@ -344,7 +345,7 @@ func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
 		time.Now().Unix(),
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := getTaskInfoCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := getTaskInfoCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		if err.Error() == "NOT FOUND" {
 			return nil, errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
@@ -410,7 +411,7 @@ func (p Pagination) stop() int64 {
 // ListPending returns pending tasks that are ready to be processed.
 func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
 	var op errors.Op = "rdb.ListPending"
-	if !r.client.SIsMember(ctx, base.AllQueues, qname).Val() {
+	if !r.client.SIsMember(context.Background(), base.AllQueues, qname).Val() {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	res, err := r.listMessages(base.PendingKey(qname), qname, pgn)
@@ -423,7 +424,7 @@ func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskMessage, er
 // ListActive returns all tasks that are currently being processed for the given queue.
 func (r *RDB) ListActive(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
 	var op errors.Op = "rdb.ListActive"
-	if !r.client.SIsMember(ctx, base.AllQueues, qname).Val() {
+	if !r.client.SIsMember(context.Background(), base.AllQueues, qname).Val() {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	res, err := r.listMessages(base.ActiveKey(qname), qname, pgn)
@@ -453,7 +454,7 @@ func (r *RDB) listMessages(key, qname string, pgn Pagination) ([]*base.TaskMessa
 	// correct range and reverse the list to get the tasks with pagination.
 	stop := -pgn.start() - 1
 	start := -pgn.stop() - 1
-	res, err := listMessagesCmd.Run(ctx, r.client,
+	res, err := listMessagesCmd.Run(context.Background(), r.client,
 		[]string{key}, start, stop, base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return nil, errors.E(errors.Unknown, err)
@@ -479,7 +480,7 @@ func (r *RDB) listMessages(key, qname string, pgn Pagination) ([]*base.TaskMessa
 // to be processed in the future.
 func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]base.Z, error) {
 	var op errors.Op = "rdb.ListScheduled"
-	if !r.client.SIsMember(ctx, base.AllQueues, qname).Val() {
+	if !r.client.SIsMember(context.Background(), base.AllQueues, qname).Val() {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	res, err := r.listZSetEntries(base.ScheduledKey(qname), qname, pgn)
@@ -493,7 +494,7 @@ func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]base.Z, error) {
 // and willl be retried in the future.
 func (r *RDB) ListRetry(qname string, pgn Pagination) ([]base.Z, error) {
 	var op errors.Op = "rdb.ListRetry"
-	if !r.client.SIsMember(ctx, base.AllQueues, qname).Val() {
+	if !r.client.SIsMember(context.Background(), base.AllQueues, qname).Val() {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	res, err := r.listZSetEntries(base.RetryKey(qname), qname, pgn)
@@ -506,7 +507,7 @@ func (r *RDB) ListRetry(qname string, pgn Pagination) ([]base.Z, error) {
 // ListArchived returns all tasks from the given queue that have exhausted its retry limit.
 func (r *RDB) ListArchived(qname string, pgn Pagination) ([]base.Z, error) {
 	var op errors.Op = "rdb.ListArchived"
-	if !r.client.SIsMember(ctx, base.AllQueues, qname).Val() {
+	if !r.client.SIsMember(context.Background(), base.AllQueues, qname).Val() {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	zs, err := r.listZSetEntries(base.ArchivedKey(qname), qname, pgn)
@@ -537,7 +538,7 @@ return res
 // listZSetEntries returns a list of message and score pairs in Redis sorted-set
 // with the given key.
 func (r *RDB) listZSetEntries(key, qname string, pgn Pagination) ([]base.Z, error) {
-	res, err := listZSetEntriesCmd.Run(ctx, r.client, []string{key},
+	res, err := listZSetEntriesCmd.Run(context.Background(), r.client, []string{key},
 		pgn.start(), pgn.stop(), base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return nil, errors.E(errors.Unknown, err)
@@ -664,7 +665,7 @@ func (r *RDB) RunTask(qname string, id uuid.UUID) error {
 		id.String(),
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := runTaskCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := runTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -717,7 +718,7 @@ func (r *RDB) runAll(zset, qname string) (int64, error) {
 	argv := []interface{}{
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := runAllCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := runAllCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -805,7 +806,7 @@ func (r *RDB) ArchiveAllPendingTasks(qname string) (int64, error) {
 		maxArchiveSize,
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := archiveAllPendingCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := archiveAllPendingCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Internal, err)
 	}
@@ -886,7 +887,7 @@ func (r *RDB) ArchiveTask(qname string, id uuid.UUID) error {
 		maxArchiveSize,
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := archiveTaskCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := archiveTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -951,7 +952,7 @@ func (r *RDB) archiveAll(src, dst, qname string) (int64, error) {
 		base.TaskKeyPrefix(qname),
 		qname,
 	}
-	res, err := archiveAllCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := archiveAllCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -1018,7 +1019,7 @@ func (r *RDB) DeleteTask(qname string, id uuid.UUID) error {
 		id.String(),
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := deleteTaskCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := deleteTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -1110,7 +1111,7 @@ func (r *RDB) deleteAll(key, qname string) (int64, error) {
 		base.TaskKeyPrefix(qname),
 		qname,
 	}
-	res, err := deleteAllCmd.Run(ctx, r.client, []string{key}, argv...).Result()
+	res, err := deleteAllCmd.Run(context.Background(), r.client, []string{key}, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -1151,7 +1152,7 @@ func (r *RDB) DeleteAllPendingTasks(qname string) (int64, error) {
 	argv := []interface{}{
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := deleteAllPendingCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := deleteAllPendingCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Unknown, err)
 	}
@@ -1282,7 +1283,7 @@ return 1`)
 // the queue is empty.
 func (r *RDB) RemoveQueue(qname string, force bool) error {
 	var op errors.Op = "rdb.RemoveQueue"
-	exists, err := r.client.SIsMember(ctx, base.AllQueues, qname).Result()
+	exists, err := r.client.SIsMember(context.Background(), base.AllQueues, qname).Result()
 	if err != nil {
 		return err
 	}
@@ -1303,7 +1304,7 @@ func (r *RDB) RemoveQueue(qname string, force bool) error {
 		base.ArchivedKey(qname),
 		base.DeadlinesKey(qname),
 	}
-	res, err := script.Run(ctx, r.client, keys, base.TaskKeyPrefix(qname)).Result()
+	res, err := script.Run(context.Background(), r.client, keys, base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -1313,7 +1314,7 @@ func (r *RDB) RemoveQueue(qname string, force bool) error {
 	}
 	switch n {
 	case 1:
-		if err := r.client.SRem(ctx, base.AllQueues, qname).Err(); err != nil {
+		if err := r.client.SRem(context.Background(), base.AllQueues, qname).Err(); err != nil {
 			return errors.E(op, errors.Unknown, err)
 		}
 		return nil
@@ -1336,7 +1337,7 @@ return keys`)
 // ListServers returns the list of server info.
 func (r *RDB) ListServers() ([]*base.ServerInfo, error) {
 	now := time.Now()
-	res, err := listServerKeysCmd.Run(ctx, r.client, []string{base.AllServers}, now.Unix()).Result()
+	res, err := listServerKeysCmd.Run(context.Background(), r.client, []string{base.AllServers}, now.Unix()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1346,7 +1347,7 @@ func (r *RDB) ListServers() ([]*base.ServerInfo, error) {
 	}
 	var servers []*base.ServerInfo
 	for _, key := range keys {
-		data, err := r.client.Get(ctx, key).Result()
+		data, err := r.client.Get(context.Background(), key).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1370,7 +1371,7 @@ return keys`)
 func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
 	var op errors.Op = "rdb.ListWorkers"
 	now := time.Now()
-	res, err := listWorkersCmd.Run(ctx, r.client, []string{base.AllWorkers}, now.Unix()).Result()
+	res, err := listWorkersCmd.Run(context.Background(), r.client, []string{base.AllWorkers}, now.Unix()).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -1380,7 +1381,7 @@ func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
 	}
 	var workers []*base.WorkerInfo
 	for _, key := range keys {
-		data, err := r.client.HVals(ctx, key).Result()
+		data, err := r.client.HVals(context.Background(), key).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1405,7 +1406,7 @@ return keys`)
 // ListSchedulerEntries returns the list of scheduler entries.
 func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 	now := time.Now()
-	res, err := listSchedulerKeysCmd.Run(ctx, r.client, []string{base.AllSchedulers}, now.Unix()).Result()
+	res, err := listSchedulerKeysCmd.Run(context.Background(), r.client, []string{base.AllSchedulers}, now.Unix()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1415,7 +1416,7 @@ func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 	}
 	var entries []*base.SchedulerEntry
 	for _, key := range keys {
-		data, err := r.client.LRange(ctx, key, 0, -1).Result()
+		data, err := r.client.LRange(context.Background(), key, 0, -1).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1433,7 +1434,7 @@ func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 // ListSchedulerEnqueueEvents returns the list of scheduler enqueue events.
 func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*base.SchedulerEnqueueEvent, error) {
 	key := base.SchedulerHistoryKey(entryID)
-	zs, err := r.client.ZRevRangeWithScores(ctx, key, pgn.start(), pgn.stop()).Result()
+	zs, err := r.client.ZRevRangeWithScores(context.Background(), key, pgn.start(), pgn.stop()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1455,7 +1456,7 @@ func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*bas
 // Pause pauses processing of tasks from the given queue.
 func (r *RDB) Pause(qname string) error {
 	key := base.PausedKey(qname)
-	ok, err := r.client.SetNX(ctx, key, time.Now().Unix(), 0).Result()
+	ok, err := r.client.SetNX(context.Background(), key, time.Now().Unix(), 0).Result()
 	if err != nil {
 		return err
 	}
@@ -1468,7 +1469,7 @@ func (r *RDB) Pause(qname string) error {
 // Unpause resumes processing of tasks from the given queue.
 func (r *RDB) Unpause(qname string) error {
 	key := base.PausedKey(qname)
-	deleted, err := r.client.Del(ctx, key).Result()
+	deleted, err := r.client.Del(context.Background(), key).Result()
 	if err != nil {
 		return err
 	}
@@ -1481,7 +1482,7 @@ func (r *RDB) Unpause(qname string) error {
 // ClusterKeySlot returns an integer identifying the hash slot the given queue hashes to.
 func (r *RDB) ClusterKeySlot(qname string) (int64, error) {
 	key := base.PendingKey(qname)
-	return r.client.ClusterKeySlot(ctx, key).Result()
+	return r.client.ClusterKeySlot(context.Background(), key).Result()
 }
 
 // ClusterNodes returns a list of nodes the given queue belongs to.
@@ -1490,7 +1491,7 @@ func (r *RDB) ClusterNodes(qname string) ([]redis.ClusterNode, error) {
 	if err != nil {
 		return nil, err
 	}
-	clusterSlots, err := r.client.ClusterSlots(ctx).Result()
+	clusterSlots, err := r.client.ClusterSlots(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index 5f01368..787d46c 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -5,6 +5,7 @@
 package rdb
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"testing"
@@ -34,7 +35,7 @@ func TestAllQueues(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client)
 		for _, qname := range tc.queues {
-			if err := r.client.SAdd(ctx, base.AllQueues, qname).Err(); err != nil {
+			if err := r.client.SAdd(context.Background(), base.AllQueues, qname).Err(); err != nil {
 				t.Fatalf("could not initialize all queue set: %v", err)
 			}
 		}
@@ -198,11 +199,11 @@ func TestCurrentStats(t *testing.T) {
 		h.SeedAllArchivedQueues(t, r.client, tc.archived)
 		for qname, n := range tc.processed {
 			processedKey := base.ProcessedKey(qname, now)
-			r.client.Set(ctx, processedKey, n, 0)
+			r.client.Set(context.Background(), processedKey, n, 0)
 		}
 		for qname, n := range tc.failed {
 			failedKey := base.FailedKey(qname, now)
-			r.client.Set(ctx, failedKey, n, 0)
+			r.client.Set(context.Background(), failedKey, n, 0)
 		}
 
 		got, err := r.CurrentStats(tc.qname)
@@ -247,14 +248,14 @@ func TestHistoricalStats(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client)
 
-		r.client.SAdd(ctx, base.AllQueues, tc.qname)
+		r.client.SAdd(context.Background(), base.AllQueues, tc.qname)
 		// populate last n days data
 		for i := 0; i < tc.n; i++ {
 			ts := now.Add(-time.Duration(i) * 24 * time.Hour)
 			processedKey := base.ProcessedKey(tc.qname, ts)
 			failedKey := base.FailedKey(tc.qname, ts)
-			r.client.Set(ctx, processedKey, (i+1)*1000, 0)
-			r.client.Set(ctx, failedKey, (i+1)*10, 0)
+			r.client.Set(context.Background(), processedKey, (i+1)*1000, 0)
+			r.client.Set(context.Background(), failedKey, (i+1)*10, 0)
 		}
 
 		got, err := r.HistoricalStats(tc.qname, tc.n)
@@ -3168,7 +3169,7 @@ func TestDeleteTaskWithUniqueLock(t *testing.T) {
 			}
 		}
 
-		if r.client.Exists(ctx, tc.uniqueKey).Val() != 0 {
+		if r.client.Exists(context.Background(), tc.uniqueKey).Val() != 0 {
 			t.Errorf("Uniqueness lock %q still exists", tc.uniqueKey)
 		}
 	}
@@ -3401,7 +3402,7 @@ func TestDeleteAllArchivedTasksWithUniqueKey(t *testing.T) {
 		}
 
 		for _, uniqueKey := range tc.uniqueKeys {
-			if r.client.Exists(ctx, uniqueKey).Val() != 0 {
+			if r.client.Exists(context.Background(), uniqueKey).Val() != 0 {
 				t.Errorf("Uniqueness lock %q still exists", uniqueKey)
 			}
 		}
@@ -3702,7 +3703,7 @@ func TestRemoveQueue(t *testing.T) {
 				tc.qname, tc.force, err)
 			continue
 		}
-		if r.client.SIsMember(ctx, base.AllQueues, tc.qname).Val() {
+		if r.client.SIsMember(context.Background(), base.AllQueues, tc.qname).Val() {
 			t.Errorf("%q is a member of %q", tc.qname, base.AllQueues)
 		}
 
@@ -3715,12 +3716,12 @@ func TestRemoveQueue(t *testing.T) {
 			base.ArchivedKey(tc.qname),
 		}
 		for _, key := range keys {
-			if r.client.Exists(ctx, key).Val() != 0 {
+			if r.client.Exists(context.Background(), key).Val() != 0 {
 				t.Errorf("key %q still exists", key)
 			}
 		}
 
-		if n := len(r.client.Keys(ctx, base.TaskKeyPrefix(tc.qname) + "*").Val()); n != 0 {
+		if n := len(r.client.Keys(context.Background(), base.TaskKeyPrefix(tc.qname) + "*").Val()); n != 0 {
 			t.Errorf("%d keys still exists for tasks", n)
 		}
 	}
@@ -4137,7 +4138,7 @@ func TestRecordSchedulerEnqueueEventTrimsDataSet(t *testing.T) {
 	}
 
 	// Make sure the set is full.
-	if n := r.client.ZCard(ctx, key).Val(); n != maxEvents {
+	if n := r.client.ZCard(context.Background(), key).Val(); n != maxEvents {
 		t.Fatalf("unexpected number of events; got %d, want %d", n, maxEvents)
 	}
 
@@ -4149,7 +4150,7 @@ func TestRecordSchedulerEnqueueEventTrimsDataSet(t *testing.T) {
 	if err := r.RecordSchedulerEnqueueEvent(entryID, &event); err != nil {
 		t.Fatalf("RecordSchedulerEnqueueEvent failed: %v", err)
 	}
-	if n := r.client.ZCard(ctx, key).Val(); n != maxEvents {
+	if n := r.client.ZCard(context.Background(), key).Val(); n != maxEvents {
 		t.Fatalf("unexpected number of events; got %d, want %d", n, maxEvents)
 	}
 	events, err := r.ListSchedulerEnqueueEvents(entryID, Pagination{Size: maxEvents})
@@ -4182,7 +4183,7 @@ func TestPause(t *testing.T) {
 			t.Errorf("Pause(%q) returned error: %v", tc.qname, err)
 		}
 		key := base.PausedKey(tc.qname)
-		if r.client.Exists(ctx, key).Val() == 0 {
+		if r.client.Exists(context.Background(), key).Val() == 0 {
 			t.Errorf("key %q does not exist", key)
 		}
 	}
@@ -4237,7 +4238,7 @@ func TestUnpause(t *testing.T) {
 			t.Errorf("Unpause(%q) returned error: %v", tc.qname, err)
 		}
 		key := base.PausedKey(tc.qname)
-		if r.client.Exists(ctx, key).Val() == 1 {
+		if r.client.Exists(context.Background(), key).Val() == 1 {
 			t.Errorf("key %q exists", key)
 		}
 	}
diff --git a/internal/rdb/rdb.go b/internal/rdb/rdb.go
index 857e0f9..1b8410f 100644
--- a/internal/rdb/rdb.go
+++ b/internal/rdb/rdb.go
@@ -18,8 +18,6 @@ import (
 
 const statsTTL = 90 * 24 * time.Hour // 90 days
 
-var ctx = context.Background()
-
 // RDB is a client interface to query and mutate task queues.
 type RDB struct {
 	client redis.UniversalClient
@@ -42,11 +40,11 @@ func (r *RDB) Client() redis.UniversalClient {
 
 // Ping checks the connection with redis server.
 func (r *RDB) Ping() error {
-	return r.client.Ping(ctx).Err()
+	return r.client.Ping(context.Background()).Err()
 }
 
 func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
-	if err := script.Run(ctx, r.client, keys, args...).Err(); err != nil {
+	if err := script.Run(context.Background(), r.client, keys, args...).Err(); err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
 	return nil
@@ -82,7 +80,7 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -136,7 +134,7 @@ func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
 	if err != nil {
 		return errors.E(op, errors.Internal, "cannot encode task message: %v", err)
 	}
-	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -151,7 +149,7 @@ func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
 		msg.Timeout,
 		msg.Deadline,
 	}
-	res, err := enqueueUniqueCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := enqueueUniqueCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -226,7 +224,7 @@ func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, deadline time.Ti
 			time.Now().Unix(),
 			base.TaskKeyPrefix(qname),
 		}
-		res, err := dequeueCmd.Run(ctx, r.client, keys, argv...).Result()
+		res, err := dequeueCmd.Run(context.Background(), r.client, keys, argv...).Result()
 		if err == redis.Nil {
 			continue
 		} else if err != nil {
@@ -381,7 +379,7 @@ func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -430,7 +428,7 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode task message: %v", err))
 	}
-	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -446,7 +444,7 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 		msg.Timeout,
 		msg.Deadline,
 	}
-	res, err := scheduleUniqueCmd.Run(ctx, r.client, keys, argv...).Result()
+	res, err := scheduleUniqueCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -621,7 +619,7 @@ return table.getn(ids)`)
 // from the src zset to the dst list. It returns the number of tasks moved.
 func (r *RDB) forward(src, dst, taskKeyPrefix string) (int, error) {
 	now := float64(time.Now().Unix())
-	res, err := forwardCmd.Run(ctx, r.client, []string{src, dst}, now, taskKeyPrefix).Result()
+	res, err := forwardCmd.Run(context.Background(), r.client, []string{src, dst}, now, taskKeyPrefix).Result()
 	if err != nil {
 		return 0, errors.E(errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -668,7 +666,7 @@ func (r *RDB) ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*bas
 	var op errors.Op = "rdb.ListDeadlineExceeded"
 	var msgs []*base.TaskMessage
 	for _, qname := range qnames {
-		res, err := listDeadlineExceededCmd.Run(ctx, r.client,
+		res, err := listDeadlineExceededCmd.Run(context.Background(), r.client,
 			[]string{base.DeadlinesKey(qname)},
 			deadline.Unix(), base.TaskKeyPrefix(qname)).Result()
 		if err != nil {
@@ -723,10 +721,10 @@ func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo
 	}
 	skey := base.ServerInfoKey(info.Host, info.PID, info.ServerID)
 	wkey := base.WorkersKey(info.Host, info.PID, info.ServerID)
-	if err := r.client.ZAdd(ctx, base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
+	if err := r.client.ZAdd(context.Background(), base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
-	if err := r.client.ZAdd(ctx, base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
+	if err := r.client.ZAdd(context.Background(), base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
 	return r.runScript(op, writeServerStateCmd, []string{skey, wkey}, args...)
@@ -744,10 +742,10 @@ func (r *RDB) ClearServerState(host string, pid int, serverID string) error {
 	var op errors.Op = "rdb.ClearServerState"
 	skey := base.ServerInfoKey(host, pid, serverID)
 	wkey := base.WorkersKey(host, pid, serverID)
-	if err := r.client.ZRem(ctx, base.AllServers, skey).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllServers, skey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.ZRem(ctx, base.AllWorkers, wkey).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllWorkers, wkey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
 	return r.runScript(op, clearServerStateCmd, []string{skey, wkey})
@@ -777,7 +775,7 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 	}
 	exp := time.Now().Add(ttl).UTC()
 	key := base.SchedulerEntriesKey(schedulerID)
-	err := r.client.ZAdd(ctx, base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
+	err := r.client.ZAdd(context.Background(), base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
 	if err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
@@ -788,10 +786,10 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 	var op errors.Op = "rdb.ClearSchedulerEntries"
 	key := base.SchedulerEntriesKey(scheduelrID)
-	if err := r.client.ZRem(ctx, base.AllSchedulers, key).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllSchedulers, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.Del(ctx, key).Err(); err != nil {
+	if err := r.client.Del(context.Background(), key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -800,8 +798,8 @@ func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 // CancelationPubSub returns a pubsub for cancelation messages.
 func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 	var op errors.Op = "rdb.CancelationPubSub"
-	pubsub := r.client.Subscribe(ctx, base.CancelChannel)
-	_, err := pubsub.Receive(ctx)
+	pubsub := r.client.Subscribe(context.Background(), base.CancelChannel)
+	_, err := pubsub.Receive(context.Background())
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub receive error: %v", err))
 	}
@@ -812,7 +810,7 @@ func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 // The message is the ID for the task to be canceled.
 func (r *RDB) PublishCancelation(id string) error {
 	var op errors.Op = "rdb.PublishCancelation"
-	if err := r.client.Publish(ctx, base.CancelChannel, id).Err(); err != nil {
+	if err := r.client.Publish(context.Background(), base.CancelChannel, id).Err(); err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub publish error: %v", err))
 	}
 	return nil
@@ -852,7 +850,7 @@ func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerE
 func (r *RDB) ClearSchedulerHistory(entryID string) error {
 	var op errors.Op = "rdb.ClearSchedulerHistory"
 	key := base.SchedulerHistoryKey(entryID)
-	if err := r.client.Del(ctx, key).Err(); err != nil {
+	if err := r.client.Del(context.Background(), key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
diff --git a/internal/rdb/rdb_test.go b/internal/rdb/rdb_test.go
index a0df45b..907aeff 100644
--- a/internal/rdb/rdb_test.go
+++ b/internal/rdb/rdb_test.go
@@ -5,6 +5,7 @@
 package rdb
 
 import (
+	"context"
 	"encoding/json"
 	"flag"
 	"strconv"
@@ -85,7 +86,7 @@ func TestEnqueue(t *testing.T) {
 
 		// Check Pending list has task ID.
 		pendingKey := base.PendingKey(tc.msg.Queue)
-		pendingIDs := r.client.LRange(ctx, pendingKey, 0, -1).Val()
+		pendingIDs := r.client.LRange(context.Background(), pendingKey, 0, -1).Val()
 		if n := len(pendingIDs); n != 1 {
 			t.Errorf("Redis LIST %q contains %d IDs, want 1", pendingKey, n)
 			continue
@@ -97,26 +98,26 @@ func TestEnqueue(t *testing.T) {
 
 		// Check the value under the task key.
 		taskKey := base.TaskKey(tc.msg.Queue, tc.msg.ID.String())
-		encoded := r.client.HGet(ctx, taskKey, "msg").Val() // "msg" field
+		encoded := r.client.HGet(context.Background(), taskKey, "msg").Val() // "msg" field
 		decoded := h.MustUnmarshal(t, encoded)
 		if diff := cmp.Diff(tc.msg, decoded); diff != "" {
 			t.Errorf("persisted message was %v, want %v; (-want, +got)\n%s", decoded, tc.msg, diff)
 		}
-		state := r.client.HGet(ctx, taskKey, "state").Val() // "state" field
+		state := r.client.HGet(context.Background(), taskKey, "state").Val() // "state" field
 		if state != "pending" {
 			t.Errorf("state field under task-key is set to %q, want %q", state, "pending")
 		}
-		timeout := r.client.HGet(ctx, taskKey, "timeout").Val() // "timeout" field
+		timeout := r.client.HGet(context.Background(), taskKey, "timeout").Val() // "timeout" field
 		if want := strconv.Itoa(int(tc.msg.Timeout)); timeout != want {
 			t.Errorf("timeout field under task-key is set to %v, want %v", timeout, want)
 		}
-		deadline := r.client.HGet(ctx, taskKey, "deadline").Val() // "deadline" field
+		deadline := r.client.HGet(context.Background(), taskKey, "deadline").Val() // "deadline" field
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-key is set to %v, want %v", deadline, want)
 		}
 
 		// Check queue is in the AllQueues set.
-		if !r.client.SIsMember(ctx, base.AllQueues, tc.msg.Queue).Val() {
+		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
 			t.Errorf("%q is not a member of SET %q", tc.msg.Queue, base.AllQueues)
 		}
 	}
@@ -158,13 +159,13 @@ func TestEnqueueUnique(t *testing.T) {
 		if diff := cmp.Diff(tc.msg, gotPending[0]); diff != "" {
 			t.Errorf("persisted data differed from the original input (-want, +got)\n%s", diff)
 		}
-		if !r.client.SIsMember(ctx, base.AllQueues, tc.msg.Queue).Val() {
+		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
 			t.Errorf("%q is not a member of SET %q", tc.msg.Queue, base.AllQueues)
 		}
 
 		// Check Pending list has task ID.
 		pendingKey := base.PendingKey(tc.msg.Queue)
-		pendingIDs := r.client.LRange(ctx, pendingKey, 0, -1).Val()
+		pendingIDs := r.client.LRange(context.Background(), pendingKey, 0, -1).Val()
 		if len(pendingIDs) != 1 {
 			t.Errorf("Redis LIST %q contains %d IDs, want 1", pendingKey, len(pendingIDs))
 			continue
@@ -176,30 +177,30 @@ func TestEnqueueUnique(t *testing.T) {
 
 		// Check the value under the task key.
 		taskKey := base.TaskKey(tc.msg.Queue, tc.msg.ID.String())
-		encoded := r.client.HGet(ctx, taskKey, "msg").Val() // "msg" field
+		encoded := r.client.HGet(context.Background(), taskKey, "msg").Val() // "msg" field
 		decoded := h.MustUnmarshal(t, encoded)
 		if diff := cmp.Diff(tc.msg, decoded); diff != "" {
 			t.Errorf("persisted message was %v, want %v; (-want, +got)\n%s", decoded, tc.msg, diff)
 		}
-		state := r.client.HGet(ctx, taskKey, "state").Val() // "state" field
+		state := r.client.HGet(context.Background(), taskKey, "state").Val() // "state" field
 		if state != "pending" {
 			t.Errorf("state field under task-key is set to %q, want %q", state, "pending")
 		}
-		timeout := r.client.HGet(ctx, taskKey, "timeout").Val() // "timeout" field
+		timeout := r.client.HGet(context.Background(), taskKey, "timeout").Val() // "timeout" field
 		if want := strconv.Itoa(int(tc.msg.Timeout)); timeout != want {
 			t.Errorf("timeout field under task-key is set to %v, want %v", timeout, want)
 		}
-		deadline := r.client.HGet(ctx, taskKey, "deadline").Val() // "deadline" field
+		deadline := r.client.HGet(context.Background(), taskKey, "deadline").Val() // "deadline" field
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-key is set to %v, want %v", deadline, want)
 		}
-		uniqueKey := r.client.HGet(ctx, taskKey, "unique_key").Val() // "unique_key" field
+		uniqueKey := r.client.HGet(context.Background(), taskKey, "unique_key").Val() // "unique_key" field
 		if uniqueKey != tc.msg.UniqueKey {
 			t.Errorf("uniqueue_key field under task key is set to %q, want %q", uniqueKey, tc.msg.UniqueKey)
 		}
 
 		// Check queue is in the AllQueues set.
-		if !r.client.SIsMember(ctx, base.AllQueues, tc.msg.Queue).Val() {
+		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
 			t.Errorf("%q is not a member of SET %q", tc.msg.Queue, base.AllQueues)
 		}
 
@@ -209,7 +210,7 @@ func TestEnqueueUnique(t *testing.T) {
 			t.Errorf("Second message: (*RDB).EnqueueUnique(msg, ttl) = %v, want %v", got, errors.ErrDuplicateTask)
 			continue
 		}
-		gotTTL := r.client.TTL(ctx, tc.msg.UniqueKey).Val()
+		gotTTL := r.client.TTL(context.Background(), tc.msg.UniqueKey).Val()
 		if !cmp.Equal(tc.ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 2)) {
 			t.Errorf("TTL %q = %v, want %v", tc.msg.UniqueKey, gotTTL, tc.ttl)
 			continue
@@ -681,7 +682,7 @@ func TestDone(t *testing.T) {
 			for _, msg := range msgs {
 				// Set uniqueness lock if unique key is present.
 				if len(msg.UniqueKey) > 0 {
-					err := r.client.SetNX(ctx, msg.UniqueKey, msg.ID.String(), time.Minute).Err()
+					err := r.client.SetNX(context.Background(), msg.UniqueKey, msg.ID.String(), time.Minute).Err()
 					if err != nil {
 						t.Fatal(err)
 					}
@@ -711,17 +712,17 @@ func TestDone(t *testing.T) {
 		}
 
 		processedKey := base.ProcessedKey(tc.target.Queue, time.Now())
-		gotProcessed := r.client.Get(ctx, processedKey).Val()
+		gotProcessed := r.client.Get(context.Background(), processedKey).Val()
 		if gotProcessed != "1" {
 			t.Errorf("%s; GET %q = %q, want 1", tc.desc, processedKey, gotProcessed)
 		}
 
-		gotTTL := r.client.TTL(ctx, processedKey).Val()
+		gotTTL := r.client.TTL(context.Background(), processedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("%s; TTL %q = %v, want less than or equal to %v", tc.desc, processedKey, gotTTL, statsTTL)
 		}
 
-		if len(tc.target.UniqueKey) > 0 && r.client.Exists(ctx, tc.target.UniqueKey).Val() != 0 {
+		if len(tc.target.UniqueKey) > 0 && r.client.Exists(context.Background(), tc.target.UniqueKey).Val() != 0 {
 			t.Errorf("%s; Uniqueness lock %q still exists", tc.desc, tc.target.UniqueKey)
 		}
 	}
@@ -899,7 +900,7 @@ func TestSchedule(t *testing.T) {
 
 		// Check Scheduled zset has task ID.
 		scheduledKey := base.ScheduledKey(tc.msg.Queue)
-		zs := r.client.ZRangeWithScores(ctx, scheduledKey, 0, -1).Val()
+		zs := r.client.ZRangeWithScores(context.Background(), scheduledKey, 0, -1).Val()
 		if n := len(zs); n != 1 {
 			t.Errorf("Redis ZSET %q contains %d elements, want 1",
 				scheduledKey, n)
@@ -918,28 +919,28 @@ func TestSchedule(t *testing.T) {
 
 		// Check the values under the task key.
 		taskKey := base.TaskKey(tc.msg.Queue, tc.msg.ID.String())
-		encoded := r.client.HGet(ctx, taskKey, "msg").Val() // "msg" field
+		encoded := r.client.HGet(context.Background(), taskKey, "msg").Val() // "msg" field
 		decoded := h.MustUnmarshal(t, encoded)
 		if diff := cmp.Diff(tc.msg, decoded); diff != "" {
 			t.Errorf("persisted message was %v, want %v; (-want, +got)\n%s",
 				decoded, tc.msg, diff)
 		}
-		state := r.client.HGet(ctx, taskKey, "state").Val() // "state" field
+		state := r.client.HGet(context.Background(), taskKey, "state").Val() // "state" field
 		if want := "scheduled"; state != want {
 			t.Errorf("state field under task-key is set to %q, want %q",
 				state, want)
 		}
-		timeout := r.client.HGet(ctx, taskKey, "timeout").Val() // "timeout" field
+		timeout := r.client.HGet(context.Background(), taskKey, "timeout").Val() // "timeout" field
 		if want := strconv.Itoa(int(tc.msg.Timeout)); timeout != want {
 			t.Errorf("timeout field under task-key is set to %v, want %v", timeout, want)
 		}
-		deadline := r.client.HGet(ctx, taskKey, "deadline").Val() // "deadline" field
+		deadline := r.client.HGet(context.Background(), taskKey, "deadline").Val() // "deadline" field
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-ke is set to %v, want %v", deadline, want)
 		}
 
 		// Check queue is in the AllQueues set.
-		if !r.client.SIsMember(ctx, base.AllQueues, tc.msg.Queue).Val() {
+		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
 			t.Errorf("%q is not a member of SET %q", tc.msg.Queue, base.AllQueues)
 		}
 	}
@@ -976,7 +977,7 @@ func TestScheduleUnique(t *testing.T) {
 
 		// Check Scheduled zset has task ID.
 		scheduledKey := base.ScheduledKey(tc.msg.Queue)
-		zs := r.client.ZRangeWithScores(ctx, scheduledKey, 0, -1).Val()
+		zs := r.client.ZRangeWithScores(context.Background(), scheduledKey, 0, -1).Val()
 		if n := len(zs); n != 1 {
 			t.Errorf("Redis ZSET %q contains %d elements, want 1",
 				scheduledKey, n)
@@ -995,32 +996,32 @@ func TestScheduleUnique(t *testing.T) {
 
 		// Check the values under the task key.
 		taskKey := base.TaskKey(tc.msg.Queue, tc.msg.ID.String())
-		encoded := r.client.HGet(ctx, taskKey, "msg").Val() // "msg" field
+		encoded := r.client.HGet(context.Background(), taskKey, "msg").Val() // "msg" field
 		decoded := h.MustUnmarshal(t, encoded)
 		if diff := cmp.Diff(tc.msg, decoded); diff != "" {
 			t.Errorf("persisted message was %v, want %v; (-want, +got)\n%s",
 				decoded, tc.msg, diff)
 		}
-		state := r.client.HGet(ctx, taskKey, "state").Val() // "state" field
+		state := r.client.HGet(context.Background(), taskKey, "state").Val() // "state" field
 		if want := "scheduled"; state != want {
 			t.Errorf("state field under task-key is set to %q, want %q",
 				state, want)
 		}
-		timeout := r.client.HGet(ctx, taskKey, "timeout").Val() // "timeout" field
+		timeout := r.client.HGet(context.Background(), taskKey, "timeout").Val() // "timeout" field
 		if want := strconv.Itoa(int(tc.msg.Timeout)); timeout != want {
 			t.Errorf("timeout field under task-key is set to %v, want %v", timeout, want)
 		}
-		deadline := r.client.HGet(ctx, taskKey, "deadline").Val() // "deadline" field
+		deadline := r.client.HGet(context.Background(), taskKey, "deadline").Val() // "deadline" field
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-key is set to %v, want %v", deadline, want)
 		}
-		uniqueKey := r.client.HGet(ctx, taskKey, "unique_key").Val() // "unique_key" field
+		uniqueKey := r.client.HGet(context.Background(), taskKey, "unique_key").Val() // "unique_key" field
 		if uniqueKey != tc.msg.UniqueKey {
 			t.Errorf("uniqueue_key field under task key is set to %q, want %q", uniqueKey, tc.msg.UniqueKey)
 		}
 
 		// Check queue is in the AllQueues set.
-		if !r.client.SIsMember(ctx, base.AllQueues, tc.msg.Queue).Val() {
+		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
 			t.Errorf("%q is not a member of SET %q", tc.msg.Queue, base.AllQueues)
 		}
 
@@ -1031,7 +1032,7 @@ func TestScheduleUnique(t *testing.T) {
 			continue
 		}
 
-		gotTTL := r.client.TTL(ctx, tc.msg.UniqueKey).Val()
+		gotTTL := r.client.TTL(context.Background(), tc.msg.UniqueKey).Val()
 		if !cmp.Equal(tc.ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL %q = %v, want %v", tc.msg.UniqueKey, gotTTL, tc.ttl)
 			continue
@@ -1189,21 +1190,21 @@ func TestRetry(t *testing.T) {
 		}
 
 		processedKey := base.ProcessedKey(tc.msg.Queue, time.Now())
-		gotProcessed := r.client.Get(ctx, processedKey).Val()
+		gotProcessed := r.client.Get(context.Background(), processedKey).Val()
 		if gotProcessed != "1" {
 			t.Errorf("GET %q = %q, want 1", processedKey, gotProcessed)
 		}
-		gotTTL := r.client.TTL(ctx, processedKey).Val()
+		gotTTL := r.client.TTL(context.Background(), processedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", processedKey, gotTTL, statsTTL)
 		}
 
 		failedKey := base.FailedKey(tc.msg.Queue, time.Now())
-		gotFailed := r.client.Get(ctx, failedKey).Val()
+		gotFailed := r.client.Get(context.Background(), failedKey).Val()
 		if gotFailed != "1" {
 			t.Errorf("GET %q = %q, want 1", failedKey, gotFailed)
 		}
-		gotTTL = r.client.TTL(ctx, failedKey).Val()
+		gotTTL = r.client.TTL(context.Background(), failedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", failedKey, gotTTL, statsTTL)
 		}
@@ -1399,21 +1400,21 @@ func TestArchive(t *testing.T) {
 		}
 
 		processedKey := base.ProcessedKey(tc.target.Queue, time.Now())
-		gotProcessed := r.client.Get(ctx, processedKey).Val()
+		gotProcessed := r.client.Get(context.Background(), processedKey).Val()
 		if gotProcessed != "1" {
 			t.Errorf("GET %q = %q, want 1", processedKey, gotProcessed)
 		}
-		gotTTL := r.client.TTL(ctx, processedKey).Val()
+		gotTTL := r.client.TTL(context.Background(), processedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", processedKey, gotTTL, statsTTL)
 		}
 
 		failedKey := base.FailedKey(tc.target.Queue, time.Now())
-		gotFailed := r.client.Get(ctx, failedKey).Val()
+		gotFailed := r.client.Get(context.Background(), failedKey).Val()
 		if gotFailed != "1" {
 			t.Errorf("GET %q = %q, want 1", failedKey, gotFailed)
 		}
-		gotTTL = r.client.TTL(ctx, processedKey).Val()
+		gotTTL = r.client.TTL(context.Background(), processedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", failedKey, gotTTL, statsTTL)
 		}
@@ -1683,7 +1684,7 @@ func TestWriteServerState(t *testing.T) {
 
 	// Check ServerInfo was written correctly.
 	skey := base.ServerInfoKey(host, pid, serverID)
-	data := r.client.Get(ctx, skey).Val()
+	data := r.client.Get(context.Background(), skey).Val()
 	got, err := base.DecodeServerInfo([]byte(data))
 	if err != nil {
 		t.Fatalf("could not decode server info: %v", err)
@@ -1693,12 +1694,12 @@ func TestWriteServerState(t *testing.T) {
 			got, info, diff)
 	}
 	// Check ServerInfo TTL was set correctly.
-	gotTTL := r.client.TTL(ctx, skey).Val()
+	gotTTL := r.client.TTL(context.Background(), skey).Val()
 	if !cmp.Equal(ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 		t.Errorf("TTL of %q was %v, want %v", skey, gotTTL, ttl)
 	}
 	// Check ServerInfo key was added to the set all server keys correctly.
-	gotServerKeys := r.client.ZRange(ctx, base.AllServers, 0, -1).Val()
+	gotServerKeys := r.client.ZRange(context.Background(), base.AllServers, 0, -1).Val()
 	wantServerKeys := []string{skey}
 	if diff := cmp.Diff(wantServerKeys, gotServerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllServers, gotServerKeys, wantServerKeys)
@@ -1706,12 +1707,12 @@ func TestWriteServerState(t *testing.T) {
 
 	// Check WorkersInfo was written correctly.
 	wkey := base.WorkersKey(host, pid, serverID)
-	workerExist := r.client.Exists(ctx, wkey).Val()
+	workerExist := r.client.Exists(context.Background(), wkey).Val()
 	if workerExist != 0 {
 		t.Errorf("%q key exists", wkey)
 	}
 	// Check WorkersInfo key was added to the set correctly.
-	gotWorkerKeys := r.client.ZRange(ctx, base.AllWorkers, 0, -1).Val()
+	gotWorkerKeys := r.client.ZRange(context.Background(), base.AllWorkers, 0, -1).Val()
 	wantWorkerKeys := []string{wkey}
 	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
@@ -1773,7 +1774,7 @@ func TestWriteServerStateWithWorkers(t *testing.T) {
 
 	// Check ServerInfo was written correctly.
 	skey := base.ServerInfoKey(host, pid, serverID)
-	data := r.client.Get(ctx, skey).Val()
+	data := r.client.Get(context.Background(), skey).Val()
 	got, err := base.DecodeServerInfo([]byte(data))
 	if err != nil {
 		t.Fatalf("could not decode server info: %v", err)
@@ -1783,12 +1784,12 @@ func TestWriteServerStateWithWorkers(t *testing.T) {
 			got, serverInfo, diff)
 	}
 	// Check ServerInfo TTL was set correctly.
-	gotTTL := r.client.TTL(ctx, skey).Val()
+	gotTTL := r.client.TTL(context.Background(), skey).Val()
 	if !cmp.Equal(ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 		t.Errorf("TTL of %q was %v, want %v", skey, gotTTL, ttl)
 	}
 	// Check ServerInfo key was added to the set correctly.
-	gotServerKeys := r.client.ZRange(ctx, base.AllServers, 0, -1).Val()
+	gotServerKeys := r.client.ZRange(context.Background(), base.AllServers, 0, -1).Val()
 	wantServerKeys := []string{skey}
 	if diff := cmp.Diff(wantServerKeys, gotServerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllServers, gotServerKeys, wantServerKeys)
@@ -1796,7 +1797,7 @@ func TestWriteServerStateWithWorkers(t *testing.T) {
 
 	// Check WorkersInfo was written correctly.
 	wkey := base.WorkersKey(host, pid, serverID)
-	wdata := r.client.HGetAll(ctx, wkey).Val()
+	wdata := r.client.HGetAll(context.Background(), wkey).Val()
 	if len(wdata) != 2 {
 		t.Fatalf("HGETALL %q returned a hash of size %d, want 2", wkey, len(wdata))
 	}
@@ -1814,12 +1815,12 @@ func TestWriteServerStateWithWorkers(t *testing.T) {
 	}
 
 	// Check WorkersInfo TTL was set correctly.
-	gotTTL = r.client.TTL(ctx, wkey).Val()
+	gotTTL = r.client.TTL(context.Background(), wkey).Val()
 	if !cmp.Equal(ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 		t.Errorf("TTL of %q was %v, want %v", wkey, gotTTL, ttl)
 	}
 	// Check WorkersInfo key was added to the set correctly.
-	gotWorkerKeys := r.client.ZRange(ctx, base.AllWorkers, 0, -1).Val()
+	gotWorkerKeys := r.client.ZRange(context.Background(), base.AllWorkers, 0, -1).Val()
 	wantWorkerKeys := []string{wkey}
 	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
@@ -1909,18 +1910,18 @@ func TestClearServerState(t *testing.T) {
 	otherSKey := base.ServerInfoKey(otherHost, otherPID, otherServerID)
 	otherWKey := base.WorkersKey(otherHost, otherPID, otherServerID)
 	// Check all keys are cleared.
-	if r.client.Exists(ctx, skey).Val() != 0 {
+	if r.client.Exists(context.Background(), skey).Val() != 0 {
 		t.Errorf("Redis key %q exists", skey)
 	}
-	if r.client.Exists(ctx, wkey).Val() != 0 {
+	if r.client.Exists(context.Background(), wkey).Val() != 0 {
 		t.Errorf("Redis key %q exists", wkey)
 	}
-	gotServerKeys := r.client.ZRange(ctx, base.AllServers, 0, -1).Val()
+	gotServerKeys := r.client.ZRange(context.Background(), base.AllServers, 0, -1).Val()
 	wantServerKeys := []string{otherSKey}
 	if diff := cmp.Diff(wantServerKeys, gotServerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllServers, gotServerKeys, wantServerKeys)
 	}
-	gotWorkerKeys := r.client.ZRange(ctx, base.AllWorkers, 0, -1).Val()
+	gotWorkerKeys := r.client.ZRange(context.Background(), base.AllWorkers, 0, -1).Val()
 	wantWorkerKeys := []string{otherWKey}
 	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
 		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
diff --git a/processor_test.go b/processor_test.go
index 252a95b..32f7820 100644
--- a/processor_test.go
+++ b/processor_test.go
@@ -119,7 +119,7 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 			}
 		}
 		time.Sleep(2 * time.Second) // wait for two second to allow all pending tasks to be processed.
-		if l := r.LLen(ctx, base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), l)
 		}
 		p.shutdown()
@@ -211,7 +211,7 @@ func TestProcessorSuccessWithMultipleQueues(t *testing.T) {
 		time.Sleep(2 * time.Second)
 		// Make sure no messages are stuck in active list.
 		for _, qname := range tc.queues {
-			if l := r.LLen(ctx, base.ActiveKey(qname)).Val(); l != 0 {
+			if l := r.LLen(context.Background(), base.ActiveKey(qname)).Val(); l != 0 {
 				t.Errorf("%q has %d tasks, want 0", base.ActiveKey(qname), l)
 			}
 		}
@@ -290,7 +290,7 @@ func TestProcessTasksWithLargeNumberInPayload(t *testing.T) {
 
 		p.start(&sync.WaitGroup{})
 		time.Sleep(2 * time.Second) // wait for two second to allow all pending tasks to be processed.
-		if l := r.LLen(ctx, base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), l)
 		}
 		p.shutdown()
@@ -439,7 +439,7 @@ func TestProcessorRetry(t *testing.T) {
 			t.Errorf("%s: mismatch found in %q after running processor; (-want, +got)\n%s", tc.desc, base.ArchivedKey(base.DefaultQueueName), diff)
 		}
 
-		if l := r.LLen(ctx, base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%s: %q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), tc.desc, l)
 		}
 
@@ -593,7 +593,7 @@ func TestProcessorWithStrictPriority(t *testing.T) {
 		time.Sleep(tc.wait)
 		// Make sure no tasks are stuck in active list.
 		for _, qname := range tc.queues {
-			if l := r.LLen(ctx, base.ActiveKey(qname)).Val(); l != 0 {
+			if l := r.LLen(context.Background(), base.ActiveKey(qname)).Val(); l != 0 {
 				t.Errorf("%q has %d tasks, want 0", base.ActiveKey(qname), l)
 			}
 		}
diff --git a/tools/asynq/cmd/migrate.go b/tools/asynq/cmd/migrate.go
index 79f32d6..bedf81a 100644
--- a/tools/asynq/cmd/migrate.go
+++ b/tools/asynq/cmd/migrate.go
@@ -20,8 +20,6 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var ctx = context.Background()
-
 // migrateCmd represents the migrate command.
 var migrateCmd = &cobra.Command{
 	Use:   "migrate",
@@ -41,10 +39,10 @@ func backupKey(key string) string {
 }
 
 func renameKeyAsBackup(c redis.UniversalClient, key string) error {
-	if c.Exists(ctx, key).Val() == 0 {
+	if c.Exists(context.Background(), key).Val() == 0 {
 		return nil // key doesn't exist; no-op
 	}
-	return c.Rename(ctx, key, backupKey(key)).Err()
+	return c.Rename(context.Background(), key, backupKey(key)).Err()
 }
 
 func failIfError(err error, msg string) {
@@ -90,11 +88,11 @@ func migrate(cmd *cobra.Command, args []string) {
 	fmt.Print("Renaming pending keys...")
 	for _, qname := range queues {
 		oldKey := fmt.Sprintf("asynq:{%s}", qname)
-		if r.Client().Exists(ctx, oldKey).Val() == 0 {
+		if r.Client().Exists(context.Background(), oldKey).Val() == 0 {
 			continue
 		}
 		newKey := base.PendingKey(qname)
-		err := r.Client().Rename(ctx, oldKey, newKey).Err()
+		err := r.Client().Rename(context.Background(), oldKey, newKey).Err()
 		failIfError(err, "Failed to rename key")
 	}
 	fmt.Print("Done\n")
@@ -143,7 +141,7 @@ func migrate(cmd *cobra.Command, args []string) {
 			backupKey(base.ArchivedKey(qname)),
 		}
 		for _, key := range keys {
-			err := r.Client().Del(ctx, key).Err()
+			err := r.Client().Del(context.Background(), key).Err()
 			failIfError(err, "Failed to delete backup key")
 		}
 	}
@@ -231,7 +229,7 @@ func DecodeMessage(s string) (*OldTaskMessage, error) {
 }
 
 func updatePendingMessages(r *rdb.RDB, qname string) {
-	data, err := r.Client().LRange(ctx, backupKey(base.PendingKey(qname)), 0, -1).Result()
+	data, err := r.Client().LRange(context.Background(), backupKey(base.PendingKey(qname)), 0, -1).Result()
 	failIfError(err, "Failed to read backup pending key")
 
 	for _, s := range data {
@@ -239,11 +237,11 @@ func updatePendingMessages(r *rdb.RDB, qname string) {
 		failIfError(err, "Failed to unmarshal message")
 
 		if msg.UniqueKey != "" {
-			ttl, err := r.Client().TTL(ctx, msg.UniqueKey).Result()
+			ttl, err := r.Client().TTL(context.Background(), msg.UniqueKey).Result()
 			failIfError(err, "Failed to get ttl")
 
 			if ttl > 0 {
-				err = r.Client().Del(ctx, msg.UniqueKey).Err()
+				err = r.Client().Del(context.Background(), msg.UniqueKey).Err()
 				logIfError(err, "Failed to delete unique key")
 			}
 
@@ -292,7 +290,7 @@ func ZAddTask(c redis.UniversalClient, key string, msg *base.TaskMessage, score
 	if err != nil {
 		return err
 	}
-	if err := c.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := c.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return err
 	}
 	keys := []string{
@@ -307,7 +305,7 @@ func ZAddTask(c redis.UniversalClient, key string, msg *base.TaskMessage, score
 		msg.Deadline,
 		state,
 	}
-	return taskZAddCmd.Run(ctx, c, keys, argv...).Err()
+	return taskZAddCmd.Run(context.Background(), c, keys, argv...).Err()
 }
 
 // KEYS[1] -> unique key
@@ -343,7 +341,7 @@ func ZAddTaskUnique(c redis.UniversalClient, key string, msg *base.TaskMessage,
 	if err != nil {
 		return err
 	}
-	if err := c.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := c.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return err
 	}
 	keys := []string{
@@ -360,7 +358,7 @@ func ZAddTaskUnique(c redis.UniversalClient, key string, msg *base.TaskMessage,
 		msg.Deadline,
 		state,
 	}
-	res, err := taskZAddUniqueCmd.Run(ctx, c, keys, argv...).Result()
+	res, err := taskZAddUniqueCmd.Run(context.Background(), c, keys, argv...).Result()
 	if err != nil {
 		return err
 	}
@@ -375,7 +373,7 @@ func ZAddTaskUnique(c redis.UniversalClient, key string, msg *base.TaskMessage,
 }
 
 func updateZSetMessages(c redis.UniversalClient, key, state string) {
-	zs, err := c.ZRangeWithScores(ctx, backupKey(key), 0, -1).Result()
+	zs, err := c.ZRangeWithScores(context.Background(), backupKey(key), 0, -1).Result()
 	failIfError(err, "Failed to read")
 
 	for _, z := range zs {
@@ -383,11 +381,11 @@ func updateZSetMessages(c redis.UniversalClient, key, state string) {
 		failIfError(err, "Failed to unmarshal message")
 
 		if msg.UniqueKey != "" {
-			ttl, err := c.TTL(ctx, msg.UniqueKey).Result()
+			ttl, err := c.TTL(context.Background(), msg.UniqueKey).Result()
 			failIfError(err, "Failed to get ttl")
 
 			if ttl > 0 {
-				err = c.Del(ctx, msg.UniqueKey).Err()
+				err = c.Del(context.Background(), msg.UniqueKey).Err()
 				logIfError(err, "Failed to delete unique key")
 			}