diff --git a/app/controllers/google_sign_in/base_controller.rb b/app/controllers/google_sign_in/base_controller.rb
index 340997c..5c630c4 100644
--- a/app/controllers/google_sign_in/base_controller.rb
+++ b/app/controllers/google_sign_in/base_controller.rb
@@ -9,7 +9,7 @@ def client
         GoogleSignIn.client_id,
         GoogleSignIn.client_secret,
         authorize_url: 'https://accounts.google.com/o/oauth2/auth',
-        token_url: 'https://www.googleapis.com/oauth2/v3/token',
+        token_url: 'https://www.googleapis.com/oauth2/v4/token',
         redirect_uri: callback_url
     end
 end
diff --git a/test/controllers/callbacks_controller_test.rb b/test/controllers/callbacks_controller_test.rb
index 75bec5c..86f559f 100644
--- a/test/controllers/callbacks_controller_test.rb
+++ b/test/controllers/callbacks_controller_test.rb
@@ -27,7 +27,7 @@ class GoogleSignIn::CallbacksControllerTest < ActionDispatch::IntegrationTest
 
   private
     def stub_token_request(code:, **params)
-      stub_request(:post, 'https://www.googleapis.com/oauth2/v3/token').
+      stub_request(:post, 'https://www.googleapis.com/oauth2/v4/token').
         with(body: { grant_type: 'authorization_code', code: code,
           client_id: FAKE_GOOGLE_CLIENT_ID, client_secret: FAKE_GOOGLE_CLIENT_SECRET,
           redirect_uri: 'http://www.example.com/google_sign_in/callback' }).