diff --git a/pyproject.toml b/pyproject.toml
index f2f3d3842..7bec60b7a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ dependencies = [
     "Brotli>=1.0,<1.1",
     "certifi>=2019.9.11",  # no semver here - this should always be on the last release!
     "cryptography>=38.0,<40.1",
-    "flask>=1.1.1,<2.3",
+    "flask>=1.1.1,<2.4",
     "h11>=0.11,<0.15",
     "h2>=4.1,<5",
     "hyperframe>=6.0,<7",