diff --git a/config/packages/twig.yaml b/config/packages/twig.yaml
index 02674b0..f9f4cc5 100644
--- a/config/packages/twig.yaml
+++ b/config/packages/twig.yaml
@@ -1,3 +1,6 @@
 twig:
     default_path: '%kernel.project_dir%/templates'
-    form_themes: ['bootstrap_5_layout.html.twig']
+
+when@test:
+    twig:
+        strict_variables: true