diff --git a/core/core.php b/core/core.php
index fd396300..8d0fe0ae 100755
--- a/core/core.php
+++ b/core/core.php
@@ -1573,10 +1573,15 @@ class common {
 
 			$this->setData(['core', 'dataVersion', 10400]);
 
-			/**
-			 *  mettre à jour defaultdata
-			 */
+		}
+		// Version 10.4.05
+		if ($this->getData(['core', 'dataVersion']) < 10405) {
 
+			// Mise à jour forcée des thèmes
+			unlink (self::DATA_DIR . 'admin.css');
+			unlink (self::DATA_DIR . 'theme.css');
+
+			$this->setData(['core', 'dataVersion', 10405]);
 		}
 	}
 }