diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c9614ed82..be7c6dd16 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -51,6 +51,7 @@ stages:
   # TODO: restore some backend
   # Install poetry
   pip3 install poetry
+  poetry config experimental.new-installer false
   poetry install 
   poetry run opsiconfd --setup --log-level-stderr=5
   # Create adminuser used with opsiconfd-perftest.py