diff --git a/VERSION.txt b/VERSION.txt
index e4c57af..2fc7b36 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-v0.6.3
+v0.6.4
diff --git a/go.mod b/go.mod
index f4f6de7..c019d2d 100644
--- a/go.mod
+++ b/go.mod
@@ -17,3 +17,5 @@ require (
 	gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
 	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
 )
+
+go 1.13