diff --git a/setup.py b/setup.py
index 89f1f04..cdbb2a6 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 aiohttp_extras = {"aiohttp<4"} | trigger_extras
 django_extras = {"Django<5"} | trigger_extras
 falcon_extras = {"falcon<4", "falcon-multipart==0.2.0"} | trigger_extras
-flask_extras = {"Flask<3"} | trigger_extras
+flask_extras = {"Flask<4"} | trigger_extras
 fastapi_extras = {
     "fastapi<1",
     "uvicorn[standard]<1.0",