diff --git a/regen-hambach-2/version.txt b/regen-hambach-2/version.txt
index 857572fc..6adeec59 100644
--- a/regen-hambach-2/version.txt
+++ b/regen-hambach-2/version.txt
@@ -1 +1 @@
-v4.0.0
+EXPERIMENTAL=true v4.0.0