diff --git a/Dockerfile.ci b/Dockerfile.ci
index ffc1cd2b..023680d4 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -42,4 +42,8 @@ RUN printf '%s\n' \
   > /usr/local/bin/ci-entrypoint \
   && chmod +x /usr/local/bin/ci-entrypoint
 
+RUN if [ -f composer.json ]; then \
+      composer install --no-interaction --prefer-dist --no-progress; \
+    fi
+
 ENTRYPOINT ["ci-entrypoint"]