diff --git a/cue.mod/module.cue b/cue.mod/module.cue
index e7d3032..72b6906 100644
--- a/cue.mod/module.cue
+++ b/cue.mod/module.cue
@@ -1 +1,4 @@
+language: version: "v0.9.0"
+
 module: "github.com/owulveryck/cue4puml4c4"
+