diff --git a/flask_restx/schemas/__init__.py b/flask_restx/schemas/__init__.py
index 27b9866..4369737 100644
--- a/flask_restx/schemas/__init__.py
+++ b/flask_restx/schemas/__init__.py
@@ -7,7 +7,7 @@ and allows to validate specs against them.
 import io
 import json
 
-import importlib_resources
+import importlib.resources
 
 from collections.abc import Mapping
 from jsonschema import Draft4Validator
@@ -57,7 +57,7 @@ class LazySchema(Mapping):
 
     def _load(self):
         if not self._schema:
-            ref = importlib_resources.files(__name__) / self.filename
+            ref = importlib.resources.files(__name__) / self.filename
 
             with io.open(ref) as infile:
                 self._schema = json.load(infile)