diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index b2ba535..0a42bfe 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -45,6 +45,7 @@ jobs:
         uses: docker/build-push-action@v4
         with:
           context: ./mdbook
+          file: Containerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}