diff --git a/go.mod b/go.mod
index 1216e51..0249af4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/nspcc-dev/tzhash
 
+go 1.12
+
 require github.com/stretchr/testify v1.3.0