diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 8173cf5..25b6eab 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -122,7 +122,12 @@ jobs:
           echo "build_version=$BUILD_VERSION" >> $GITHUB_OUTPUT
 
       - name: Free disk space
-        run: docker system prune -f || true
+        run: |
+          # Remove all unused images (including old :SHA tags) and containers.
+          docker system prune -af || true
+          # Keep the local BuildKit cache bounded so pip mount cache survives
+          # but stale intermediate layers don't accumulate indefinitely.
+          docker builder prune --keep-storage 5g -f || true
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v4
@@ -142,5 +147,3 @@ jobs:
           provenance: false
           tags: ${{ steps.tags.outputs.value }}
           build-args: BUILD_VERSION=${{ steps.tags.outputs.build_version }}
-          cache-from: type=registry,ref=${{ env.IMAGE }}:cache
-          cache-to: type=registry,ref=${{ env.IMAGE }}:cache,mode=max