diff --git a/.github/workflows/build-docker.yml b/.github/workflows/build-docker.yml
index 517b88648..d704001e1 100644
--- a/.github/workflows/build-docker.yml
+++ b/.github/workflows/build-docker.yml
@@ -19,6 +19,8 @@ on:
       - pyproject.toml
       # And when we change this workflow itself...
       - .github/workflows/build-docker.yml
+      # Or when we change the Dockerfile!
+      - Dockerfile
 
 jobs:
   docker-publish: