diff --git a/eco_build_images/wordpress_phpunit_test_runner.Dockerfile b/eco_build_images/wordpress_phpunit_test_runner.Dockerfile
index 42e0a1fb..93500e97 100644
--- a/eco_build_images/wordpress_phpunit_test_runner.Dockerfile
+++ b/eco_build_images/wordpress_phpunit_test_runner.Dockerfile
@@ -32,6 +32,7 @@ COPY wordpress_phpunit_test_runner.entrypoint /entrypoint.sh
 WORKDIR /phpunit-test-runner
 
 ENV COMPOSER_ALLOW_SUPERUSER=1
+RUN npm cache clean --force
 RUN bash -c 'source /root/.bashrc && source .env && php prepare.php'
 
 ENTRYPOINT ["/entrypoint.sh"]