diff --git a/src/Resources/skeletons/BaseExtension/bootstrap_package/Configuration/RTE/Default.yaml.twig b/src/Resources/skeletons/BaseExtension/bootstrap_package/Configuration/RTE/Default.yaml.twig
index 282236e..be9c9e7 100644
--- a/src/Resources/skeletons/BaseExtension/bootstrap_package/Configuration/RTE/Default.yaml.twig
+++ b/src/Resources/skeletons/BaseExtension/bootstrap_package/Configuration/RTE/Default.yaml.twig
@@ -6,4 +6,4 @@ imports:
 
 editor:
     config:
-        contentsCss: "EXT:bootstrap_package/Resources/Public/Css/bootstrap4-rte.min.css"
+        contentsCss: "EXT:bootstrap_package/Resources/Public/Css/{% if package.typo3version < 10004000 %}bootstrap4{% else %}bootstrap5{% endif %}-rte.min.css"
\ No newline at end of file