diff --git a/setup.py b/setup.py
index 1edea7de..f69cdd36 100755
--- a/setup.py
+++ b/setup.py
@@ -46,6 +46,7 @@ def run_tests(self):
     test_suite='',
     tests_require=[
         'werkzeug==2.2.3',
+        'flask<=2.2.4',
         'pytest',
         'pytest-cov',
         'httpbin==0.5.0',