diff --git a/backend/Dockerfile b/backend/Dockerfile
index a7aaa6b3..d944fd5a 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,3 +1,5 @@
+#syntax=docker/dockerfile:1.7-labs
+
 FROM node:22 AS build-stage
 
 WORKDIR /app/dwengo
@@ -17,7 +19,7 @@ RUN npm install --silent
 # Root tsconfig.json
 COPY tsconfig.json tsconfig.build.json ./
 
-COPY backend ./backend
+COPY --exclude=backend/tests/ backend ./backend
 COPY common ./common
 COPY docs ./docs
 
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 1ddb8dc0..c4de2191 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -1,3 +1,5 @@
+#syntax=docker/dockerfile:1.7-labs
+
 FROM node:22 AS build-stage
 
 # install simple http server for serving static content
@@ -26,7 +28,7 @@ RUN npm run build --workspace=common
 
 WORKDIR /app/dwengo/frontend
 
-COPY frontend ./
+COPY --exclude=frontend/tests/ frontend ./
 
 RUN npx vite build