diff --git a/requirements-dev.txt b/requirements-dev.txt
index 70a960f..b8e13e1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
 -r requirements.txt
-Flask==1.0
+Flask==2.3.2
 Flask-SQLAlchemy==2.1
 pytest==3.0.6
diff --git a/setup.py b/setup.py
index ec0173a..8bb4871 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@
       packages=['polymorphic_sqlalchemy'],
       zip_safe=False,
       test_suite="tests",
-      tests_require=['Flask==1.0',
+      tests_require=['Flask==2.3.2',
                      'Flask-SQLAlchemy==2.4.0',
                      'pytest==4.5.0', ],
       long_description=long_description,