diff --git a/main.go b/main.go
index e5606c7..76e9d1c 100644
--- a/main.go
+++ b/main.go
@@ -10,6 +10,7 @@ import (
 	"github.com/jobtalk/thor/subcmd/mkelb"
 	"github.com/jobtalk/thor/subcmd/update"
 	"github.com/jobtalk/thor/subcmd/vault"
+	"github.com/jobtalk/thor/vars"
 	"github.com/mitchellh/cli"
 )
 
@@ -33,6 +34,10 @@ func init() {
 	}
 	VERSION = generateBuildInfo()
 	log.SetFlags(log.Llongfile)
+
+	vars.VERSION = &VERSION
+	vars.BUILD_DATE = &BUILD_DATE
+	vars.BUILD_OS = &BUILD_OS
 }
 
 func main() {
diff --git a/subcmd/update/update.go b/subcmd/update/update.go
index 6cf1f20..7b34e79 100644
--- a/subcmd/update/update.go
+++ b/subcmd/update/update.go
@@ -9,6 +9,8 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+
+	"github.com/jobtalk/thor/vars"
 )
 
 const (
@@ -80,6 +82,10 @@ func (c *Update) Run(args []string) int {
 		platform = "linux-amd64"
 	}
 	latest := tags[0].Name
+	if *vars.VERSION == latest {
+		fmt.Println("this version is latest")
+		return 0
+	}
 	if latest == "" {
 		fmt.Println("can not get latest version")
 		return 255
diff --git a/vars/vars.go b/vars/vars.go
new file mode 100644
index 0000000..96af933
--- /dev/null
+++ b/vars/vars.go
@@ -0,0 +1,7 @@
+package vars
+
+var (
+	VERSION    *string
+	BUILD_DATE *string
+	BUILD_OS   *string
+)