diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index a5a1c36..b989839 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -978,9 +978,11 @@ func (r *RDB) RunAllAggregatingTasks(qname, gname string) (int64, error) {
 // Input:
 // KEYS[1] -> asynq:{<qname>}:t:<task_id>
 // KEYS[2] -> asynq:{<qname>}:pending
+// KEYS[3] -> asynq:{<qname>}:groups
 // --
 // ARGV[1] -> task ID
 // ARGV[2] -> queue key prefix; asynq:{<qname>}:
+// ARGV[3] -> group key prefix
 //
 // Output:
 // Numeric code indicating the status:
@@ -993,15 +995,24 @@ var runTaskCmd = redis.NewScript(`
 if redis.call("EXISTS", KEYS[1]) == 0 then
 	return 0
 end
-local state = redis.call("HGET", KEYS[1], "state")
+local state, group = unpack(redis.call("HMGET", KEYS[1], "state", "group"))
 if state == "active" then
 	return -1
 elseif state == "pending" then
 	return -2
-end
-local n = redis.call("ZREM", ARGV[2] .. state, ARGV[1])
-if n == 0 then
-	return redis.error_reply("internal error: task id not found in zset " .. tostring(state))
+elseif state == "aggregating" then
+	local n = redis.call("ZREM", ARGV[3] .. group, ARGV[1])
+	if n == 0 then
+		return redis.error_reply("internal error: task id not found in zset " .. tostring(ARGV[3] .. group))
+	end
+	if redis.call("ZCARD", ARGV[3] .. group) == 0 then
+		redis.call("SREM", KEYS[3], group)
+	end
+else
+	local n = redis.call("ZREM", ARGV[2] .. state, ARGV[1])
+	if n == 0 then
+		return redis.error_reply("internal error: task id not found in zset " .. tostring(ARGV[2] .. state))
+	end
 end
 redis.call("LPUSH", KEYS[2], ARGV[1])
 redis.call("HSET", KEYS[1], "state", "pending")
@@ -1022,10 +1033,12 @@ func (r *RDB) RunTask(qname, id string) error {
 	keys := []string{
 		base.TaskKey(qname, id),
 		base.PendingKey(qname),
+		base.AllGroups(qname),
 	}
 	argv := []interface{}{
 		id,
 		base.QueueKeyPrefix(qname),
+		base.GroupKeyPrefix(qname),
 	}
 	res, err := runTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index 5212920..5987100 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -1986,6 +1986,111 @@ func TestRunRetryTask(t *testing.T) {
 	}
 }
 
+func TestRunAggregatingTask(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	now := time.Now()
+	r.SetClock(timeutil.NewSimulatedClock(now))
+	m1 := h.NewTaskMessageBuilder().SetQueue("default").SetType("task1").SetGroup("group1").Build()
+	m2 := h.NewTaskMessageBuilder().SetQueue("default").SetType("task2").SetGroup("group1").Build()
+	m3 := h.NewTaskMessageBuilder().SetQueue("custom").SetType("task3").SetGroup("group1").Build()
+
+	fxt := struct {
+		tasks     []*h.TaskSeedData
+		allQueues []string
+		allGroups map[string][]string
+		groups    map[string][]*redis.Z
+	}{
+		tasks: []*h.TaskSeedData{
+			{Msg: m1, State: base.TaskStateAggregating},
+			{Msg: m2, State: base.TaskStateAggregating},
+			{Msg: m3, State: base.TaskStateAggregating},
+		},
+		allQueues: []string{"default", "custom"},
+		allGroups: map[string][]string{
+			base.AllGroups("default"): {"group1"},
+			base.AllGroups("custom"):  {"group1"},
+		},
+		groups: map[string][]*redis.Z{
+			base.GroupKey("default", "group1"): {
+				{Member: m1.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+				{Member: m2.ID, Score: float64(now.Add(-25 * time.Second).Unix())},
+			},
+			base.GroupKey("custom", "group1"): {
+				{Member: m3.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+			},
+		},
+	}
+
+	tests := []struct {
+		desc          string
+		qname         string
+		id            string
+		wantPending   map[string][]string
+		wantAllGroups map[string][]string
+		wantGroups    map[string][]redis.Z
+	}{
+		{
+			desc:  "schedules task from a group with multiple tasks",
+			qname: "default",
+			id:    m1.ID,
+			wantPending: map[string][]string{
+				base.PendingKey("default"): {m1.ID},
+			},
+			wantAllGroups: map[string][]string{
+				base.AllGroups("default"): {"group1"},
+				base.AllGroups("custom"):  {"group1"},
+			},
+			wantGroups: map[string][]redis.Z{
+				base.GroupKey("default", "group1"): {
+					{Member: m2.ID, Score: float64(now.Add(-25 * time.Second).Unix())},
+				},
+				base.GroupKey("custom", "group1"): {
+					{Member: m3.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+				},
+			},
+		},
+		{
+			desc:  "schedules task from a group with a single task",
+			qname: "custom",
+			id:    m3.ID,
+			wantPending: map[string][]string{
+				base.PendingKey("custom"): {m3.ID},
+			},
+			wantAllGroups: map[string][]string{
+				base.AllGroups("default"): {"group1"},
+				base.AllGroups("custom"):  {},
+			},
+			wantGroups: map[string][]redis.Z{
+				base.GroupKey("default", "group1"): {
+					{Member: m1.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+					{Member: m2.ID, Score: float64(now.Add(-25 * time.Second).Unix())},
+				},
+				base.GroupKey("custom", "group1"): {},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r.client)
+		h.SeedTasks(t, r.client, fxt.tasks)
+		h.SeedRedisSet(t, r.client, base.AllQueues, fxt.allQueues)
+		h.SeedRedisSets(t, r.client, fxt.allGroups)
+		h.SeedRedisZSets(t, r.client, fxt.groups)
+
+		t.Run(tc.desc, func(t *testing.T) {
+			err := r.RunTask(tc.qname, tc.id)
+			if err != nil {
+				t.Fatalf("RunTask returned error: %v", err)
+			}
+
+			h.AssertRedisLists(t, r.client, tc.wantPending)
+			h.AssertRedisZSets(t, r.client, tc.wantGroups)
+			h.AssertRedisSets(t, r.client, tc.wantAllGroups)
+		})
+	}
+}
+
 func TestRunScheduledTask(t *testing.T) {
 	r := setup(t)
 	defer r.Close()