diff --git a/Makefile b/Makefile
index cd90be8..9ae4ae2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # "Makefile" for graftcp.
-# Copyright (C) 2016, 2018, 2020, 2021 Hmgle <dustgle@gmail.com>
+# Copyright (C) 2016, 2018, 2020, 2021, 2023 Hmgle <dustgle@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -46,7 +46,7 @@ else
 endif
 
 ifneq ($(shell echo $(VERSION) | head -c 1), v)
-	VERSION=v0.5
+	VERSION=v0.6
 endif
 CFLAGS += -DVERSION=\"$(VERSION)\"
 
diff --git a/graftcp.c b/graftcp.c
index 266b8a8..eee0d7a 100644
--- a/graftcp.c
+++ b/graftcp.c
@@ -30,7 +30,7 @@
 #include "string-set.h"
 
 #ifndef VERSION
-#define VERSION "v0.5"
+#define VERSION "v0.6"
 #endif
 
 struct sockaddr_in PROXY_SA;
diff --git a/local/Makefile b/local/Makefile
index d62c754..c9ba9e5 100644
--- a/local/Makefile
+++ b/local/Makefile
@@ -1,5 +1,5 @@
 ifneq ($(shell echo $(VERSION) | head -c 1), v)
-	VERSION=v0.5
+	VERSION=v0.6
 endif
 
 GO_BUILD_PREFIX_FLAGS :=
diff --git a/local/cmd/graftcp-local/main.go b/local/cmd/graftcp-local/main.go
index 7d4ae52..6658ce6 100644
--- a/local/cmd/graftcp-local/main.go
+++ b/local/cmd/graftcp-local/main.go
@@ -13,7 +13,7 @@ import (
 
 var (
 	selectProxyMode string
-	version         = "v0.5"
+	version         = "v0.6"
 )
 
 // App for graftcp-local.
diff --git a/local/cmd/mgraftcp/main.go b/local/cmd/mgraftcp/main.go
index 99305ca..da7ce2e 100644
--- a/local/cmd/mgraftcp/main.go
+++ b/local/cmd/mgraftcp/main.go
@@ -10,6 +10,7 @@ package main
 //
 // int client_main(int argc, char **argv);
 import "C"
+
 import (
 	"bufio"
 	"fmt"
@@ -63,7 +64,7 @@ var (
 	help        bool
 	showVersion bool
 
-	version = "v0.5"
+	version = "v0.6"
 )
 
 func init() {