diff --git a/bumblebee_status/modules/contrib/gcalendar.py b/bumblebee_status/modules/contrib/gcalendar.py
index e438bdd..c88cfad 100644
--- a/bumblebee_status/modules/contrib/gcalendar.py
+++ b/bumblebee_status/modules/contrib/gcalendar.py
@@ -29,6 +29,7 @@ import core.decorators
 
 import datetime
 import os.path
+import pickle
 
 from google.auth.transport.requests import Request
 from google.oauth2.credentials import Credentials
@@ -60,7 +61,8 @@ class Module(core.module.Module):
         # created automatically when the authorization flow completes for the first
         # time.
         if os.path.exists(self.__token):
-            creds = Credentials.from_authorized_user_file(self.__token, SCOPES)
+            with open(self.__token, 'rb') as token:
+                creds = pickle.load(token)
         # If there are no (valid) credentials available, let the user log in.
         if not creds or not creds.valid:
             if creds and creds.expired and creds.refresh_token:
@@ -71,8 +73,8 @@ class Module(core.module.Module):
                 )
                 creds = flow.run_local_server(port=0)
             # Save the credentials for the next run
-            with open(self.__token, "w") as token:
-                token.write(creds.to_json())
+            with open(self.__token, 'wb') as token:
+                pickle.dump(creds, token)
 
         try:
             service = build("calendar", "v3", credentials=creds)