diff --git a/go.mod b/go.mod
index f72a016a..5ceabdd5 100644
--- a/go.mod
+++ b/go.mod
@@ -40,3 +40,5 @@ require (
 )
 
 replace github.com/fullsailor/pkcs7 => github.com/groob/pkcs7 v0.0.0-20180824154052-36585635cb64
+
+go 1.13