diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1dea617..83a4299 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -39,6 +39,7 @@ include:
       - .composer-cache/
       - vendor/
   before_script:
+    - docker-php-ext-install bcmath
     - composer config gitlab-token.lab.s-web.fr "${CI_DEPLOY_USER}" "${CI_DEPLOY_PASSWORD}"
     - composer install --no-interaction --optimize-autoloader --no-scripts
   rules: