diff --git a/PicoContentEditor.php b/PicoContentEditor.php
index 55ce44b..77f4d74 100644
--- a/PicoContentEditor.php
+++ b/PicoContentEditor.php
@@ -26,7 +26,7 @@ class PicoContentEditor extends AbstractPicoPlugin implements ApiAware
      * Pico API version.
      * @var int
      */
-    const API_VERSION = 3;
+    const API_VERSION = 4;
 
     /**
      * EditorHandler (ContentToolsHandler, QuillHandler...)