diff --git a/api_client.py b/api_client.py
index 77312d0..f6e8c11 100644
--- a/api_client.py
+++ b/api_client.py
@@ -21,7 +21,7 @@ class TogglClientApi:
     requests = None
 
     def __init__(self, credentials):
-        self.credentials = dict(self.defaultCredentials.items() + credentials.items())
+        self.credentials = self.defaultCredentials | credentials
         self.api_base_url = self.build_api_url(self.credentials['base_url'], self.credentials['ver_api'])
         self.api_report_base_url = self.build_api_url(self.credentials['base_url_report'], self.credentials['ver_report'])
         self.api_token = self.credentials['token']