diff --git a/.github/workflows/test_semeio.yml b/.github/workflows/test_semeio.yml
index 2ee928a77bd..01688470e87 100644
--- a/.github/workflows/test_semeio.yml
+++ b/.github/workflows/test_semeio.yml
@@ -22,7 +22,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: '3.12'
+        python-version: '3.11'
 
     - name: Install ert
       run: |