diff --git a/utils/google_service.py b/utils/google_service.py
index 0859cfc..110d27b 100644
--- a/utils/google_service.py
+++ b/utils/google_service.py
@@ -25,8 +25,11 @@ class GoogleService:
         creds = Credentials.from_authorized_user_file(token_path, SCOPES)
         if creds.expired and creds.refresh_token:
             creds.refresh(Request())
-            with open(token_path, "w") as f:
-                f.write(creds.to_json())
+            try:
+                with open(token_path, "w") as f:
+                    f.write(creds.to_json())
+            except OSError:
+                pass  # read-only mount; refreshed creds live in memory
         self._creds = creds
 
         self._calendar = build("calendar", "v3", credentials=creds)