diff --git a/.gitea/workflows/build-demo.yaml b/.gitea/workflows/build-demo.yaml
index 8ea380b..799a5d2 100644
--- a/.gitea/workflows/build-demo.yaml
+++ b/.gitea/workflows/build-demo.yaml
@@ -4,14 +4,12 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
-    container:
-      image: python:3.9
     steps:
       - name: Checkout master
         uses: https://gitea.com/actions/checkout@v4
 
-      - name: Check the Python installation
-        run: python3 --version
+      - name: Install Python
+        run: apt-get install python3.9
 
       - name: Install Material for MkDocs
         run: pip install mkdocs-material