diff --git a/go.mod b/go.mod
index e13477f..0ffd320 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/digio/covermate
 
-go 1.12
+go 1.13
 
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
diff --git a/testdata/x:y.go b/testdata/x.go
similarity index 100%
rename from testdata/x:y.go
rename to testdata/x.go
diff --git a/testdata/x:y_test.go b/testdata/x_test.go
similarity index 100%
rename from testdata/x:y_test.go
rename to testdata/x_test.go