diff --git a/authlib/integrations/flask_oauth2/errors.py b/authlib/integrations/flask_oauth2/errors.py
index 23c9e57c..fb2f3a1f 100644
--- a/authlib/integrations/flask_oauth2/errors.py
+++ b/authlib/integrations/flask_oauth2/errors.py
@@ -1,7 +1,9 @@
+import importlib
+
 import werkzeug
 from werkzeug.exceptions import HTTPException
 
-_version = werkzeug.__version__.split('.')[0]
+_version = importlib.metadata.version('werkzeug').split('.')[0]
 
 if _version in ('0', '1'):
     class _HTTPException(HTTPException):