diff --git a/pyproject.toml b/pyproject.toml
index 57f18d0c0..9e1f27cbb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
     "requests>=2.25,<3",
     "SQLAlchemy>=1.3.0,<1.5",
     "SQLAlchemy-Continuum>=1.3.12,<2", # New 1.4 changes API, see #728
-    "Werkzeug>=2,<3",
+    "Werkzeug>=2,<4",
     "WTForms>=2.3.3,<3.3",]
 
 [project.optional-dependencies]