diff --git a/.forgejo/workflows/demo.yaml b/.forgejo/workflows/demo.yaml
index b1abaaa..4c6f1fc 100644
--- a/.forgejo/workflows/demo.yaml
+++ b/.forgejo/workflows/demo.yaml
@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     name: Build and push docker image
-    runs-on: docker
+    runs-on: docker:docker://alpine:3.19
     steps:
       - name: Check out the repo
         uses: actions/checkout@v4