diff --git a/jupyter/base/values/values.yaml b/jupyter/base/values/values.yaml
index 64a1813..6dbb98a 100644
--- a/jupyter/base/values/values.yaml
+++ b/jupyter/base/values/values.yaml
@@ -13,10 +13,14 @@ hub:
     oauthCode: |
       import time
       from oauthenticator.generic import GenericOAuthenticator
+
       def post_auth_hook(authenticator, handler, authentication):
         user = authentication['auth_state']['oauth_user']['ocs']['data']['id']
-        authentication['auth_state']['token_expires'] =  time.time() + auth_state['token_response']['expires_in']
+        auth_state = authentication['auth_state']
+        auth_state['token_expires'] =  time.time() + auth_state['token_response']['expires_in']
+        authentication['auth_state'] = auth_state
         return authentication
+
       class NextcloudOAuthenticator(GenericOAuthenticator):
         def __init__(self, *args, **kwargs):
           super().__init__(*args, **kwargs)