diff --git a/vcfanno.go b/vcfanno.go
index 70ac42c..f745ce7 100644
--- a/vcfanno.go
+++ b/vcfanno.go
@@ -26,7 +26,7 @@ import (
 	"github.com/brentp/xopen"
 )
 
-var VERSION = "0.3.4"
+const VERSION = "0.3.5"
 
 func envGet(name string, vdefault int) int {
 	sval := os.Getenv(name)