diff --git a/command.go b/command.go
index f62ea1e..6b4f7b7 100644
--- a/command.go
+++ b/command.go
@@ -104,7 +104,7 @@ func setCommand(writer *RESPWriter, args []RESP) {
 				writer.WriteError(errParseInteger)
 				return
 			}
-			ttl = time.Now().Add(time.Second * time.Duration(n)).UnixNano()
+			ttl = dict.GetNanoTime() + int64(time.Second)*int64(n)
 			extra = extra[2:]
 
 			// PX
@@ -114,7 +114,7 @@ func setCommand(writer *RESPWriter, args []RESP) {
 				writer.WriteError(errParseInteger)
 				return
 			}
-			ttl = time.Now().Add(time.Millisecond * time.Duration(n)).UnixNano()
+			ttl = dict.GetNanoTime() + int64(time.Millisecond)*int64(n)
 			extra = extra[2:]
 
 			// KEEPTTL
diff --git a/command_test.go b/command_test.go
index 27beb31..02a5c89 100644
--- a/command_test.go
+++ b/command_test.go
@@ -353,6 +353,18 @@ func TestCommand(t *testing.T) {
 
 		res, _ := rdb.ZRem(ctx, "rank", "player1", "player2", "player999").Result()
 		assert.Equal(res, int64(2))
+
+		// err wrong type
+		rdb.Set(ctx, "key", "value", 0)
+
+		_, err := rdb.ZAdd(ctx, "key", redis.Z{}).Result()
+		assert.Equal(err.Error(), errWrongType.Error())
+
+		_, err = rdb.ZRank(ctx, "key", "member1").Result()
+		assert.Equal(err.Error(), errWrongType.Error())
+
+		_, err = rdb.ZRem(ctx, "key", "member1").Result()
+		assert.Equal(err.Error(), errWrongType.Error())
 	})
 
 	t.Run("flushdb", func(t *testing.T) {
diff --git a/go.mod b/go.mod
index ca04cf0..c3bdbe3 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,6 @@ go 1.22
 require (
 	github.com/chen3feng/stl4go v0.1.1
 	github.com/deckarep/golang-set/v2 v2.6.0
-	github.com/dolthub/swiss v0.2.1
 	github.com/influxdata/tdigest v0.0.1
 	github.com/redis/go-redis/v9 v9.5.2
 	github.com/rs/zerolog v1.33.0
@@ -18,7 +17,6 @@ require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
-	github.com/dolthub/maphash v0.1.0 // indirect
 	github.com/edsrzf/mmap-go v1.1.0 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
diff --git a/go.sum b/go.sum
index 603c4fb..8fb972a 100644
--- a/go.sum
+++ b/go.sum
@@ -14,10 +14,6 @@ github.com/deckarep/golang-set/v2 v2.6.0 h1:XfcQbWM1LlMB8BsJ8N9vW5ehnnPVIw0je80N
 github.com/deckarep/golang-set/v2 v2.6.0/go.mod h1:VAky9rY/yGXJOLEDv3OMci+7wtDpOF4IN+y82NBOac4=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
-github.com/dolthub/maphash v0.1.0 h1:bsQ7JsF4FkkWyrP3oCnFJgrCUAFbFf3kOl4L/QxPDyQ=
-github.com/dolthub/maphash v0.1.0/go.mod h1:gkg4Ch4CdCDu5h6PMriVLawB7koZ+5ijb9puGMV50a4=
-github.com/dolthub/swiss v0.2.1 h1:gs2osYs5SJkAaH5/ggVJqXQxRXtWshF6uE0lgR/Y3Gw=
-github.com/dolthub/swiss v0.2.1/go.mod h1:8AhKZZ1HK7g18j7v7k6c5cYIGEZJcPn0ARsai8cUrh0=
 github.com/edsrzf/mmap-go v1.1.0 h1:6EUwBLQ/Mcr1EYLE4Tn1VdW1A4ckqCQWZBw8Hr0kjpQ=
 github.com/edsrzf/mmap-go v1.1.0/go.mod h1:19H/e8pUPLicwkyNgOykDXkJ9F0MHE+Z52B8EIth78Q=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
diff --git a/internal/dict/benchmark/main.go b/internal/dict/benchmark/main.go
index 5bdaef2..768f367 100644
--- a/internal/dict/benchmark/main.go
+++ b/internal/dict/benchmark/main.go
@@ -7,7 +7,6 @@ import (
 	"runtime/debug"
 	"time"
 
-	"github.com/dolthub/swiss"
 	"github.com/influxdata/tdigest"
 	"github.com/xgzlucario/rotom/internal/dict"
 )
@@ -60,15 +59,6 @@ func main() {
 			m[k] = v
 			td.Add(float64(time.Since(start)), 1)
 		}
-
-	case "swiss":
-		m := swiss.NewMap[string, any](8)
-		for i := 0; i < entries; i++ {
-			k, v := genKV(i)
-			start := time.Now()
-			m.Put(k, v)
-			td.Add(float64(time.Since(start)), 1)
-		}
 	}
 	cost := time.Since(start)
 
diff --git a/internal/dict/dict.go b/internal/dict/dict.go
index ecc838c..29ab9cc 100644
--- a/internal/dict/dict.go
+++ b/internal/dict/dict.go
@@ -3,8 +3,6 @@ package dict
 import (
 	"sync/atomic"
 	"time"
-
-	"github.com/dolthub/swiss"
 )
 
 const (
@@ -34,33 +32,33 @@ func GetNanoTime() int64 {
 
 // Dict is the hashmap for Rotom.
 type Dict struct {
-	data   *swiss.Map[string, any]
-	expire *swiss.Map[string, int64]
+	data   map[string]any
+	expire map[string]int64
 }
 
 func New() *Dict {
 	return &Dict{
-		data:   swiss.NewMap[string, any](64),
-		expire: swiss.NewMap[string, int64](64),
+		data:   make(map[string]any, 64),
+		expire: make(map[string]int64, 64),
 	}
 }
 
 func (dict *Dict) Get(key string) (any, int) {
-	data, ok := dict.data.Get(key)
+	data, ok := dict.data[key]
 	if !ok {
 		// key not exist
 		return nil, KEY_NOT_EXIST
 	}
 
-	nsec, ok := dict.expire.Get(key)
+	nsec, ok := dict.expire[key]
 	if !ok {
 		return data, TTL_FOREVER
 	}
 
 	// key expired
 	if nsec < _nsec.Load() {
-		dict.data.Delete(key)
-		dict.expire.Delete(key)
+		delete(dict.data, key)
+		delete(dict.expire, key)
 		return nil, KEY_NOT_EXIST
 	}
 
@@ -68,23 +66,23 @@ func (dict *Dict) Get(key string) (any, int) {
 }
 
 func (dict *Dict) Set(key string, data any) {
-	dict.data.Put(key, data)
+	dict.data[key] = data
 }
 
 func (dict *Dict) SetWithTTL(key string, data any, ttl int64) {
 	if ttl > 0 {
-		dict.expire.Put(key, ttl)
+		dict.expire[key] = ttl
 	}
-	dict.data.Put(key, data)
+	dict.data[key] = data
 }
 
 func (dict *Dict) Delete(key string) bool {
-	_, ok := dict.data.Get(key)
+	_, ok := dict.data[key]
 	if !ok {
 		return false
 	}
-	dict.data.Delete(key)
-	dict.expire.Delete(key)
+	delete(dict.data, key)
+	delete(dict.expire, key)
 	return true
 }
 
@@ -92,35 +90,37 @@ func (dict *Dict) Delete(key string) bool {
 // return `0` if key not exist or expired.
 // return `1` if set successed.
 func (dict *Dict) SetTTL(key string, ttl int64) int {
-	_, ok := dict.data.Get(key)
+	_, ok := dict.data[key]
 	if !ok {
 		// key not exist
 		return 0
 	}
 
 	// check key if already expired
-	nsec, ok := dict.expire.Get(key)
+	nsec, ok := dict.expire[key]
 	if ok && nsec < _nsec.Load() {
-		dict.data.Delete(key)
-		dict.expire.Delete(key)
+		delete(dict.data, key)
+		delete(dict.expire, key)
 		return 0
 	}
 
 	// set ttl
-	dict.expire.Put(key, ttl)
+	dict.expire[key] = ttl
 	return 1
 }
 
 func (dict *Dict) EvictExpired() {
 	var count int
-	dict.expire.Iter(func(key string, nsec int64) bool {
+	for key, nsec := range dict.expire {
 		if _nsec.Load() > nsec {
-			dict.expire.Delete(key)
-			dict.data.Delete(key)
+			delete(dict.expire, key)
+			delete(dict.data, key)
 		}
 		count++
-		return count > 20
-	})
+		if count > 20 {
+			return
+		}
+	}
 }
 
 func nsec2duration(nsec int64) (second int) {
diff --git a/internal/hash/map.go b/internal/hash/map.go
index fcb7a66..95b4985 100644
--- a/internal/hash/map.go
+++ b/internal/hash/map.go
@@ -1,9 +1,5 @@
 package hash
 
-import (
-	"github.com/dolthub/swiss"
-)
-
 type MapI interface {
 	Set(key string, val []byte) bool
 	Get(key string) ([]byte, bool)
@@ -15,34 +11,36 @@ type MapI interface {
 var _ MapI = (*Map)(nil)
 
 type Map struct {
-	data *swiss.Map[string, []byte]
+	data map[string][]byte
 }
 
 func NewMap() *Map {
-	return &Map{swiss.NewMap[string, []byte](256)}
+	return &Map{make(map[string][]byte, 256)}
 }
 
 func (m *Map) Get(key string) ([]byte, bool) {
-	return m.data.Get(key)
+	val, ok := m.data[key]
+	return val, ok
 }
 
 func (m *Map) Set(key string, val []byte) bool {
-	_, ok := m.data.Get(key)
-	m.data.Put(key, val)
+	_, ok := m.data[key]
+	m.data[key] = val
 	return !ok
 }
 
 func (m *Map) Remove(key string) bool {
-	return m.data.Delete(key)
+	_, ok := m.data[key]
+	delete(m.data, key)
+	return ok
 }
 
 func (m *Map) Len() int {
-	return m.data.Count()
+	return len(m.data)
 }
 
 func (m *Map) Scan(fn func(key string, val []byte)) {
-	m.data.Iter(func(key string, val []byte) (stop bool) {
+	for key, val := range m.data {
 		fn(key, val)
-		return false
-	})
+	}
 }
diff --git a/internal/zset/zset.go b/internal/zset/zset.go
index 192b656..5b2ed65 100644
--- a/internal/zset/zset.go
+++ b/internal/zset/zset.go
@@ -4,7 +4,6 @@ import (
 	"cmp"
 
 	"github.com/chen3feng/stl4go"
-	"github.com/dolthub/swiss"
 )
 
 type node struct {
@@ -20,23 +19,24 @@ func nodeCompare(a, b node) int {
 }
 
 type ZSet struct {
-	m   *swiss.Map[string, float64]
+	m   map[string]float64
 	skl *stl4go.SkipList[node, struct{}]
 }
 
 func NewZSet() *ZSet {
 	return &ZSet{
-		m:   swiss.NewMap[string, float64](8),
+		m:   make(map[string]float64),
 		skl: stl4go.NewSkipListFunc[node, struct{}](nodeCompare),
 	}
 }
 
 func (z *ZSet) Get(key string) (float64, bool) {
-	return z.m.Get(key)
+	val, ok := z.m[key]
+	return val, ok
 }
 
 func (z *ZSet) Set(key string, score float64) bool {
-	old, ok := z.m.Get(key)
+	old, ok := z.m[key]
 	if ok {
 		// same
 		if score == old {
@@ -44,17 +44,17 @@ func (z *ZSet) Set(key string, score float64) bool {
 		}
 		z.skl.Remove(node{key, old})
 	}
-	z.m.Put(key, score)
+	z.m[key] = score
 	z.skl.Insert(node{key, score}, struct{}{})
 	return !ok
 }
 
 func (z *ZSet) Remove(key string) bool {
-	score, ok := z.m.Get(key)
+	score, ok := z.m[key]
 	if !ok {
 		return false
 	}
-	z.m.Delete(key)
+	delete(z.m, key)
 	z.skl.Remove(node{key, score})
 	return true
 }
@@ -65,13 +65,13 @@ func (z *ZSet) PopMin() (key string, score float64) {
 		score = n.score
 		return false
 	})
-	z.m.Delete(key)
+	delete(z.m, key)
 	z.skl.Remove(node{key, score})
 	return
 }
 
 func (z *ZSet) Rank(key string) (int, float64) {
-	score, ok := z.m.Get(key)
+	score, ok := z.m[key]
 	if !ok {
 		return -1, 0
 	}
@@ -95,5 +95,5 @@ func (z *ZSet) Range(start, stop int, fn func(key string, score float64)) {
 }
 
 func (z *ZSet) Len() int {
-	return z.m.Count()
+	return len(z.m)
 }
diff --git a/rotom.go b/rotom.go
index 8cea3c3..cf1d00e 100644
--- a/rotom.go
+++ b/rotom.go
@@ -119,7 +119,7 @@ READ:
 	client.recvx += n
 
 	if readSize == 0 {
-		log.Warn().Msgf("client %d read query empty, now free", fd)
+		log.Info().Msgf("client %d read query empty, now free", fd)
 		freeClient(client)
 		return
 	}