diff --git a/.forgejo/workflows/testing.yml b/.forgejo/workflows/testing.yml
index bee7aeb..a744176 100644
--- a/.forgejo/workflows/testing.yml
+++ b/.forgejo/workflows/testing.yml
@@ -6,11 +6,12 @@ on:
 jobs:
   test:
     runs-on: docker
+    container:
+      image: debian:bookworm
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.13'
           cache: 'pip'
       - name: Install needed python modules
         working-directory: core