diff --git a/.github/Dockerfile b/.github/Dockerfile
index f89f51e..351f47d 100644
--- a/.github/Dockerfile
+++ b/.github/Dockerfile
@@ -1,9 +1,11 @@
 ARG PHP_VERSION=8.2.11
 ARG COMPOSER_VERSION=2.6.5
 
-FROM php:${PHP_VERSION}-cli-alpine
+FROM composer:${COMPOSER_VERSION} as composer
 
-COPY --from=composer:${COMPOSER_VERSION} /usr/bin/composer /usr/bin/composer
+FROM php:${PHP_VERSION}-cli-alpine as runtime
+
+COPY --from=composer /usr/bin/composer /usr/bin/composer
 
 WORKDIR /app
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f8060dc..b36edef 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,11 +63,12 @@ jobs:
       - name: Build docker image
         run: |
           DOCKER_BUILDKIT=1 docker build \
-           --build-arg BUILDKIT_INLINE_CACHE=1 \
-           --build-arg PHP_VERSION=${{ vars.DOCKER_RUNTIME_PHP_VERSION }} \
-           --build-arg COMPOSER_VERSION=${{ vars.DOCKER_RUNTIME_COMPOSER_VERSION }} \
-           --tag=dannecron/coverage-merger:latest \
-           --file=./.github/Dockerfile .
+            --build-arg BUILDKIT_INLINE_CACHE=1 \
+            --build-arg PHP_VERSION=${{ vars.DOCKER_RUNTIME_PHP_VERSION }} \
+            --build-arg COMPOSER_VERSION=${{ vars.DOCKER_RUNTIME_COMPOSER_VERSION }} \
+            --target=runtime \
+            --tag=dannecron/coverage-merger:latest \
+            --file=./.github/Dockerfile .
       - name: Login to docker hub
         uses: actions-hub/docker/login@master
         env:
@@ -91,11 +92,12 @@ jobs:
       - name: Build docker image
         run: |
           DOCKER_BUILDKIT=1 docker build \
-           --build-arg BUILDKIT_INLINE_CACHE=1 \
-           --build-arg PHP_VERSION=${{ vars.DOCKER_RUNTIME_PHP_VERSION }} \
-           --build-arg COMPOSER_VERSION=${{ vars.DOCKER_RUNTIME_COMPOSER_VERSION }} \
-           --tag=dannecron/coverage-merger:latest \
-           --file=./.github/Dockerfile .
+            --build-arg BUILDKIT_INLINE_CACHE=1 \
+            --build-arg PHP_VERSION=${{ vars.DOCKER_RUNTIME_PHP_VERSION }} \
+            --build-arg COMPOSER_VERSION=${{ vars.DOCKER_RUNTIME_COMPOSER_VERSION }} \
+            --target=runtime
+            --tag=dannecron/coverage-merger:latest \
+            --file=./.github/Dockerfile .
       - name: Login to docker hub
         uses: actions-hub/docker/login@master
         env: