diff --git a/Gemfile.lock b/Gemfile.lock
index ac3f3829..139f61d9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: 6e4fea97354782ea89acc26f1cc291980ee2462c
+  revision: 0a194c97c857a39c03a5a02eec283e751099d402
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.12)
diff --git a/lib/travis/api/app/endpoint/authorization.rb b/lib/travis/api/app/endpoint/authorization.rb
index 61c34e9e..112316cc 100644
--- a/lib/travis/api/app/endpoint/authorization.rb
+++ b/lib/travis/api/app/endpoint/authorization.rb
@@ -196,6 +196,8 @@ class Travis::Api::App
         end
 
         class UserManager < Struct.new(:data, :token, :drop_token)
+          include User::Renaming
+
           def info(attributes = {})
             info = data.to_hash.slice('name', 'login', 'gravatar_id')
             info.merge! attributes.stringify_keys
@@ -207,10 +209,15 @@ class Travis::Api::App
             user   = ::User.find_by_github_id(data['id'])
             info   = drop_token ? info : info(github_oauth_token: token)
 
-            if user
-              user.update_attributes info
-            else
-              user = ::User.create! info
+            ActiveRecord::Base.transaction do
+              if user
+                rename_repos_owner(user.login, info['login'])
+                user.update_attributes info
+              else
+                user = ::User.create! info
+              end
+
+              nullify_logins(user.github_id, user.login)
             end
 
             user
diff --git a/spec/unit/endpoint/authorization/user_manager_spec.rb b/spec/unit/endpoint/authorization/user_manager_spec.rb
index 5ec2d89d..f8067cd0 100644
--- a/spec/unit/endpoint/authorization/user_manager_spec.rb
+++ b/spec/unit/endpoint/authorization/user_manager_spec.rb
@@ -31,7 +31,7 @@ describe Travis::Api::App::Endpoint::Authorization::UserManager do
 
     context 'with existing user' do
       it 'updates user data' do
-        user = mock('user')
+        user = stub('user', login: 'drogus', github_id: 456)
         User.expects(:find_by_github_id).with(456).returns(user)
         attributes = { login: 'drogus', github_id: 456, github_oauth_token: 'abc123' }.stringify_keys
         user.expects(:update_attributes).with(attributes)
@@ -42,7 +42,7 @@ describe Travis::Api::App::Endpoint::Authorization::UserManager do
 
     context 'without existing user' do
       it 'creates new user' do
-        user = mock('user')
+        user = stub('user', login: 'drogus', github_id: 456)
         User.expects(:find_by_github_id).with(456).returns(nil)
         attributes = { login: 'drogus', github_id: 456, github_oauth_token: 'abc123' }.stringify_keys
         User.expects(:create!).with(attributes).returns(user)