diff --git a/src/main/scala/app/SystemSettingsController.scala b/src/main/scala/app/SystemSettingsController.scala
index 2292853..c81e6d9 100644
--- a/src/main/scala/app/SystemSettingsController.scala
+++ b/src/main/scala/app/SystemSettingsController.scala
@@ -139,9 +139,10 @@
     val installedPlugins = plugin.PluginSystem.plugins
     getAvailablePlugins(installedPlugins).filter(x => pluginIds.contains(x.id)).foreach { plugin =>
       val pluginDir = new java.io.File(PluginHome, plugin.id)
-      if(!pluginDir.exists){
-        FileUtils.copyDirectory(new java.io.File(dir, plugin.repository + "/" + plugin.id), pluginDir)
+      if(pluginDir.exists){
+        FileUtils.deleteDirectory(pluginDir)
       }
+      FileUtils.copyDirectory(new java.io.File(dir, plugin.repository + "/" + plugin.id), pluginDir)
       PluginSystem.installPlugin(plugin.id)
     }
   }
diff --git a/src/main/scala/model/Plugin.scala b/src/main/scala/model/Plugin.scala
index 3295a33..bc85ca0 100644
--- a/src/main/scala/model/Plugin.scala
+++ b/src/main/scala/model/Plugin.scala
@@ -7,7 +7,7 @@
   lazy val Plugins = TableQuery[Plugins]
 
   class Plugins(tag: Tag) extends Table[Plugin](tag, "PLUGIN"){
-    val pluginId = column[String]("PLUGIN_ID")
+    val pluginId = column[String]("PLUGIN_ID", O PrimaryKey)
     val version = column[String]("VERSION")
     def * = (pluginId, version) <> (Plugin.tupled, Plugin.unapply)
   }
diff --git a/src/main/scala/plugin/PluginSystem.scala b/src/main/scala/plugin/PluginSystem.scala
index 5408aeb..c12c9cd 100644
--- a/src/main/scala/plugin/PluginSystem.scala
+++ b/src/main/scala/plugin/PluginSystem.scala
@@ -113,7 +113,7 @@
           migrate(session.conn, pluginId, plugin.get.version)
         }
       } catch {
-        case e: Exception => logger.warn(s"Error in plugin loading for ${scalaFile.getAbsolutePath}", e)
+        case e: Throwable => logger.warn(s"Error in plugin loading for ${scalaFile.getAbsolutePath}", e)
       }
     }
   }
diff --git a/src/main/scala/service/PluginService.scala b/src/main/scala/service/PluginService.scala
index 74523b2..d1bb9d8 100644
--- a/src/main/scala/service/PluginService.scala
+++ b/src/main/scala/service/PluginService.scala
@@ -6,14 +6,19 @@
 
 trait PluginService {
 
-  def getPlugins()(implicit s: Session): List[Plugin] = Plugins.sortBy(_.pluginId).list
+  def getPlugins()(implicit s: Session): List[Plugin] =
+    Plugins.sortBy(_.pluginId).list
 
-  def registerPlugin(plugin: Plugin)(implicit s: Session): Unit = Plugins.insert(plugin)
+  def registerPlugin(plugin: Plugin)(implicit s: Session): Unit =
+    Plugins.insert(plugin)
 
-  def updatePlugin(plugin: Plugin)(implicit s: Session): Unit = Plugins.update(plugin)
+  def updatePlugin(plugin: Plugin)(implicit s: Session): Unit =
+    Plugins.filter(_.pluginId === plugin.pluginId.bind).map(_.version).update(plugin.version)
 
-  def deletePlugin(pluginId: String)(implicit s: Session): Unit = Plugins.filter(_.pluginId === pluginId.bind).delete
+  def deletePlugin(pluginId: String)(implicit s: Session): Unit =
+    Plugins.filter(_.pluginId === pluginId.bind).delete
 
-  def getPlugin(pluginId: String)(implicit s: Session): Option[Plugin] = Plugins.filter(_.pluginId === pluginId.bind).firstOption
+  def getPlugin(pluginId: String)(implicit s: Session): Option[Plugin] =
+    Plugins.filter(_.pluginId === pluginId.bind).firstOption
 
 }