diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 32ef54e7c8fbd89a4f747edb85a998ff1d647883..194dcc0d444726297d94d7dd6170e224daad7084 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 include:
   - project: pole-is/tools/ci-config
-    ref: "4.0.0"
+    ref: '4.0.0'
     file:
       - /defaults.yml
       - /php/package.yml
@@ -12,8 +12,8 @@ stages:
   - test-generated
 
 variables:
-  PHP_VERSION: "7.1"
-  NODEJS_TEST_BROWSER_PACKAGES: ""
+  PHP_VERSION: '7.1'
+  NODEJS_TEST_BROWSER_PACKAGES: ''
 
 test:console:
   extends: .php-test