diff --git a/go.mod b/go.mod
index 9feb501..beaff6c 100644
--- a/go.mod
+++ b/go.mod
@@ -4,3 +4,5 @@ require (
 	golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3
 	golang.org/x/text v0.3.0 // indirect
 )
+
+go 1.13