diff --git a/.forgejo/workflows/generate-tarball.yml b/.forgejo/workflows/generate-tarball.yml
index 836dd48d9..673368248 100644
--- a/.forgejo/workflows/generate-tarball.yml
+++ b/.forgejo/workflows/generate-tarball.yml
@@ -11,7 +11,7 @@ jobs:
     name: Build tarball
     runs-on: x86_64
     container:
-      image: alpine:latest
+      image: alpine:v3.20
     env:
       CI_PROJECT_NAME: zotero
     steps:
@@ -43,7 +43,7 @@ jobs:
     runs-on: x86_64
     needs: [build-tarball]
     container:
-      image: alpine:latest
+      image: alpine:v3.20
     steps:
       - name: Environment setup
         run: apk add nodejs curl findutils