diff --git a/cmd/apex/version/version.go b/cmd/apex/version/version.go
index 58a92fa..578bec6 100644
--- a/cmd/apex/version/version.go
+++ b/cmd/apex/version/version.go
@@ -10,7 +10,7 @@ import (
 )
 
 // Version of program.
-const Version = "master"
+var Version = "master"
 
 // Command config.
 var Command = &cobra.Command{
diff --git a/go.mod b/go.mod
index feff8bc..ac441cc 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,7 @@
 module github.com/apex/apex
 
+go 1.15
+
 require (
 	github.com/Unknwon/goconfig v0.0.0-20161121224340-87a46d97951e
 	github.com/apex/log v1.0.0