diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e633d22..468a743 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,11 +10,11 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.17.x'
+          go-version: '1.21.x'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.45.2
+          version: v1.54.2
           args: --timeout 3m0s
   build:
     name: Test with Go ${{ matrix.go-version }}
@@ -23,15 +23,15 @@ jobs:
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     strategy:
       matrix:
-        go-version: [1.15, 1.16]
+        go-version: ["1.20", "1.21"]
     steps:
       - name: Install Go stable version
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go-version }}
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Test
         run: go test -v
diff --git a/go.mod b/go.mod
index 0e3f4f7..4cd28aa 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/centrifugal/protocol
 
-go 1.19
+go 1.20
 
 require (
 	github.com/mailru/easyjson v0.7.7
diff --git a/type.go b/type.go
index 5e68db6..443990e 100644
--- a/type.go
+++ b/type.go
@@ -12,6 +12,89 @@ const (
 	TypeProtobuf Type = "protobuf"
 )
 
+type FrameType uint8
+
+const (
+	FrameTypeServerPing FrameType = iota + 1
+	FrameTypeClientPong
+
+	FrameTypePushConnect
+	FrameTypePushSubscribe
+	FrameTypePushPublication
+	FrameTypePushJoin
+	FrameTypePushLeave
+	FrameTypePushUnsubscribe
+	FrameTypePushMessage
+	FrameTypePushRefresh
+	FrameTypePushDisconnect
+
+	FrameTypeConnect
+	FrameTypeSubscribe
+	FrameTypePublish
+	FrameTypeUnsubscribe
+	FrameTypeRPC
+	FrameTypePresence
+	FrameTypePresenceStats
+	FrameTypeHistory
+	FrameTypeRefresh
+	FrameTypeSubRefresh
+	FrameTypeSend
+)
+
+func (f FrameType) String() string {
+	switch f {
+	case FrameTypeServerPing:
+		return "server_ping"
+	case FrameTypeClientPong:
+		return "client_pong"
+
+	case FrameTypePushConnect:
+		return "push_connect"
+	case FrameTypePushSubscribe:
+		return "push_subscribe"
+	case FrameTypePushPublication:
+		return "push_publication"
+	case FrameTypePushJoin:
+		return "push_join"
+	case FrameTypePushLeave:
+		return "push_leave"
+	case FrameTypePushUnsubscribe:
+		return "push_unsubscribe"
+	case FrameTypePushMessage:
+		return "push_message"
+	case FrameTypePushRefresh:
+		return "push_refresh"
+	case FrameTypePushDisconnect:
+		return "push_disconnect"
+
+	case FrameTypeConnect:
+		return "connect"
+	case FrameTypeSubscribe:
+		return "subscribe"
+	case FrameTypePublish:
+		return "publish"
+	case FrameTypeUnsubscribe:
+		return "unsubscribe"
+	case FrameTypeRPC:
+		return "rpc"
+	case FrameTypePresence:
+		return "presence"
+	case FrameTypePresenceStats:
+		return "presence_stats"
+	case FrameTypeHistory:
+		return "history"
+	case FrameTypeSubRefresh:
+		return "sub_refresh"
+	case FrameTypeRefresh:
+		return "refresh"
+	case FrameTypeSend:
+		return "send"
+
+	default:
+		return "unknown"
+	}
+}
+
 var (
 	DefaultJsonPushEncoder     = NewJSONPushEncoder()
 	DefaultProtobufPushEncoder = NewProtobufPushEncoder()