diff --git a/pyproject.toml b/pyproject.toml
index 1b5baca..49f41a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ authors = [
 ]
 dynamic = ["version"]
 dependencies = [
-        "flask<3",
+        "flask<4",
         "pymongo",
         "alembic",
         "flask-sqlalchemy",