diff --git a/.github/workflows/pull-request.yaml b/.github/workflows/pull-request.yaml
index 7475ef48..abd5b1ff 100644
--- a/.github/workflows/pull-request.yaml
+++ b/.github/workflows/pull-request.yaml
@@ -14,6 +14,9 @@ jobs:
     name: Run tests
     runs-on: ubuntu-latest
 
+    container:
+      image: python:3.12
+
     steps:
 
       - name: Set version