diff --git a/.github/workflows/controller_unittests.yml b/.github/workflows/controller_unittests.yml
index 323cab08..c21e647f 100644
--- a/.github/workflows/controller_unittests.yml
+++ b/.github/workflows/controller_unittests.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Install dependencies
         working-directory: ./oidc-controller
         run: |
-          pip3 install --no-cache-dir poetry
+          pip3 install --no-cache-dir poetry==1.8.3
           poetry install
       - name: Lint with black
         working-directory: ./oidc-controller