diff --git a/resources/packages/fluid_styled_content/12.4/src/Configuration/RTE/Default.yaml.twig b/resources/packages/fluid_styled_content/12.4/src/Configuration/RTE/Default.yaml.twig
index 5d5556d..fd3bea9 100644
--- a/resources/packages/fluid_styled_content/12.4/src/Configuration/RTE/Default.yaml.twig
+++ b/resources/packages/fluid_styled_content/12.4/src/Configuration/RTE/Default.yaml.twig
@@ -7,8 +7,9 @@ editor:
     config:
         contentsCss: "EXT:{{ package.extensionKey }}/Resources/Public/Css/rte.css"
 
-        stylesSet:
-            - { name: "Lead", element: "p", attributes: { 'class': 'lead' } }
+        style:
+            definitions:
+                - { name: "Lead", element: "p", classes: ['lead'] }
 
         toolbarGroups:
             - { name: styles, groups: [ format, styles ] }
diff --git a/resources/packages/fluid_styled_content/13.4/src/Configuration/RTE/Default.yaml.twig b/resources/packages/fluid_styled_content/13.4/src/Configuration/RTE/Default.yaml.twig
index 5d5556d..fd3bea9 100644
--- a/resources/packages/fluid_styled_content/13.4/src/Configuration/RTE/Default.yaml.twig
+++ b/resources/packages/fluid_styled_content/13.4/src/Configuration/RTE/Default.yaml.twig
@@ -7,8 +7,9 @@ editor:
     config:
         contentsCss: "EXT:{{ package.extensionKey }}/Resources/Public/Css/rte.css"
 
-        stylesSet:
-            - { name: "Lead", element: "p", attributes: { 'class': 'lead' } }
+        style:
+            definitions:
+                - { name: "Lead", element: "p", classes: ['lead'] }
 
         toolbarGroups:
             - { name: styles, groups: [ format, styles ] }