diff --git a/pyproject.toml b/pyproject.toml
index b38c68b62..2f36db522 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ dependencies = [
     "Flask-Talisman>=0.8,<2",
     "Flask-WTF>=0.14.3,<2",
     "WTForms>=2.3.1,<3.2",
-    "Flask>=2,<2.3",
+    "Flask>=2,<3.1",
     "Werkzeug>=2,<2.3",
     "itsdangerous>=2,<3",
     "Jinja2>=3,<4",