diff --git a/src/installer/ParentPlugin.php b/src/installer/ParentPlugin.php
index 02f528b..2da433e 100644
--- a/src/installer/ParentPlugin.php
+++ b/src/installer/ParentPlugin.php
@@ -8,13 +8,14 @@
 namespace Seacms\ComposerInstaller;
 
 use Composer\Composer;
+use Composer\EventDispatcher\EventSubscriberInterface;
 use Composer\IO\IOInterface;
 use Composer\Plugin\Capable;
 use Composer\Plugin\PluginInterface;
 use TopFloor\ComposerCleanupVcsDirs\Plugin as TopFloorPlugin;
 
 if (class_exists(TopFloorPlugin::class,true)){
-    abstract class ParentPlugin extends TopFloorPlugin implements Capable
+    abstract class ParentPlugin extends TopFloorPlugin implements Capable, EventSubscriberInterface
     {
         /**
          * const to test if TopFloorPlugin
@@ -23,7 +24,7 @@ if (class_exists(TopFloorPlugin::class,true)){
         protected const IS_TOP_FLOOR_PLUGIN = true;
     }
 } else {
-    abstract class ParentPlugin implements PluginInterface, Capable
+    abstract class ParentPlugin implements PluginInterface, Capable, EventSubscriberInterface
     {
         
         /**
diff --git a/src/installer/Plugin.php b/src/installer/Plugin.php
index 8ae1988..b225ad8 100644
--- a/src/installer/Plugin.php
+++ b/src/installer/Plugin.php
@@ -15,6 +15,8 @@ use Composer\Repository\PathRepository;
 use Composer\Repository\RepositoryManager;
 use Composer\Repository\VcsRepository;
 use Exception;
+use Composer\Script\Event as ScriptEvent;
+use Composer\Script\ScriptEvents;
 use Seacms\ComposerInstaller\Handler;
 use Seacms\ComposerInstaller\NotFoundFileException;
 use Seacms\ComposerInstaller\ParentPlugin;
@@ -48,15 +50,26 @@ class Plugin extends ParentPlugin
         $this->io = $io;
         if (!self::IS_TOP_FLOOR_PLUGIN){
             // do nothing
+            $this->handler = null;
             return ;
         }
         $this->handler = new Handler($composer, $io);
-        try {
-            list('config' => $config,'path' => $path) = $this->getConfigJsonFile();
-            $this->updateRepositoryManager($config);
-            // $composer->getInstallationManager()->addInstaller(new LocalInstaller($io,$composer));
-        } catch (NotFoundFileException $ex){
-            // do nothing
+    }
+
+    /**
+     * manage preupdate event
+     * @param ScriptEvent $event
+     */
+    public function onPreUpdate(ScriptEvent $event)
+    {
+        if (!is_null($this->handler)){
+            try {
+                list('config' => $config,'path' => $path) = $this->getConfigJsonFile();
+                $this->updateRepositoryManager($config);
+                // $composer->getInstallationManager()->addInstaller(new LocalInstaller($io,$composer));
+            } catch (NotFoundFileException $ex){
+                // do nothing
+            }
         }
     }
     
@@ -223,4 +236,11 @@ class Plugin extends ParentPlugin
             'Composer\Plugin\Capability\CommandProvider' => 'Seacms\\Command\\Command',
         ];
     }
+    /* === implements EventsSubscriberInterface === */
+    public static function getSubscribedEvents()
+    {
+        return [
+            ScriptEvents::PRE_UPDATE_CMD => 'onPreUpdate'
+        ];
+    }
 }
\ No newline at end of file