diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 36e8b11ac..550d1716b 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -39,11 +39,8 @@ ENV STACK_ROOT="${PROJECT_DIR}/.stack"
 WORKDIR ${PROJECT_DIR}
 ENV HOME=${PROJECT_DIR}
 
-COPY stack.yaml ${PROJECT_DIR}/stack.yaml
-COPY stack.yaml.lock ${PROJECT_DIR}/stack.yaml.lock
-COPY package.yaml ${PROJECT_DIR}/package.yaml
-RUN stack install yesod-bin
-RUN stack install hpack
+RUN --mount=type=bind,source=.,target=. stack install yesod-bin
+RUN --mount=type=bind,source=.,target=. stack install hpack
 
 # pre-build dependencies
 RUN --mount=type=bind,source=.,target=. \