diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 194da3f..35c7b9f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,3 +17,12 @@ jobs:
         run: |
           docker image build . \
             --tag build-configs
+
+      - name: Run PHPStan
+        run: |
+          docker run \
+            --rm \
+            --interactive \
+            --entrypoint phpstan \
+            build-configs \
+              --no-progress
diff --git a/Dockerfile b/Dockerfile
index 4be9248..3233856 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,4 +2,17 @@ FROM php:8.1-cli
 
 WORKDIR /app
 
+RUN apt-get update -yqq \
+  && apt-get install -yqq git unzip
+
+ENV PATH="${PATH}:/app/vendor/bin"
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+COPY composer.* ./
+
+RUN composer install
+
+COPY . .
+
 ENTRYPOINT ["bash"]