diff --git a/UPGRADE.rst b/UPGRADE.rst
index d869b7111b1e3b53173006ec4e7769cc2c6728bb..228222d53422c458732797c63c2980deed12dec5 100644
--- a/UPGRADE.rst
+++ b/UPGRADE.rst
@@ -39,7 +39,7 @@ instructions that may be required are listed later in this document.
        ./synctl restart
 
 
-To check whether your update was sucessful, you can check the Server header
+To check whether your update was successful, you can check the Server header
 returned by the Client-Server API:
 
 .. code:: bash