diff --git a/setup.py b/setup.py
index 5c1958743..e02bd4b8c 100644
--- a/setup.py
+++ b/setup.py
@@ -102,7 +102,6 @@ setup(
             "dataclasses>=0.7",
         ],
         'dev': [
-            "Flask>=1.0,<1.2",
             "hypothesis>=5.8,<6",
             "parver>=0.1,<2.0",
             "pytest-asyncio>=0.10.0,<0.14,!=0.14",