diff --git a/install/mods-for-hesk/js/version-scripts.js b/install/mods-for-hesk/js/version-scripts.js
index c36267d3..5a6369a7 100644
--- a/install/mods-for-hesk/js/version-scripts.js
+++ b/install/mods-for-hesk/js/version-scripts.js
@@ -73,7 +73,7 @@ function processUpdates(startingVersion) {
         executeUpdate(25, '254', '2.5.4');
     } else if (startingVersion < 26) {
         startVersionUpgrade('255');
-        executeUpdate(25, '255', '2.5.5');
+        executeUpdate(26, '255', '2.5.5');
     } else {
         installationFinished();
     }
diff --git a/install/mods-for-hesk/sql/installSql.php b/install/mods-for-hesk/sql/installSql.php
index cc8d9a86..f272da2d 100644
--- a/install/mods-for-hesk/sql/installSql.php
+++ b/install/mods-for-hesk/sql/installSql.php
@@ -716,7 +716,7 @@ function execute254Scripts()
 // Version 2.5.5
 function execute255Scripts()
 {
-    updateVersion($version);
+    updateVersion('2.5.5');
 }
 
 function updateVersion($version) {