diff --git a/.upgrade.yml b/.upgrade.yml
deleted file mode 100644
index fb1a034..0000000
--- a/.upgrade.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-mappings:
-  BasicRestfulAuthenticator: SilverStripe\RestfulServer\BasicRestfulAuthenticator
-  RestfulServer: SilverStripe\RestfulServer\RestfulServer
-  RestfulServerItem: SilverStripe\RestfulServer\RestfulServerItem
-  RestfulServerList: SilverStripe\RestfulServer\RestfulServerList
-  RestfulServerTest: SilverStripe\RestfulServer\Tests\RestfulServerTest
-  RestfulServerTestAuthor: SilverStripe\RestfulServer\Tests\Stubs\RestfulServerTestAuthor
-  RestfulServerTestAuthorRating: SilverStripe\RestfulServer\Tests\Stubs\RestfulServerTestAuthorRating
-  RestfulServerTestComment: SilverStripe\RestfulServer\Tests\Stubs\RestfulServerTestComment
-  RestfulServerTestPage: SilverStripe\RestfulServer\Tests\Stubs\RestfulServerTestPage
-  RestfulServerTestSecretThing: SilverStripe\RestfulServer\Tests\Stubs\RestfulServerTestSecretThing
-  DataFormatter: SilverStripe\RestfulServer\DataFormatter
-  FormEncodedDataFormatter: SilverStripe\RestfulServer\DataFormatter\FormEncodedDataFormatter
-  JSONDataFormatter: SilverStripe\RestfulServer\DataFormatter\JSONDataFormatter
-  XMLDataFormatter: SilverStripe\RestfulServer\DataFormatter\XMLDataFormatter