diff --git a/pyproject.toml b/pyproject.toml
index 17c59b9f0..f967f4fc0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ dependencies = [
     "pyperclip<=1.9.0,>=1.9.0",
     "ruamel.yaml>=0.16,<=0.18.6",
     "sortedcontainers>=2.3,<=2.4.0",
-    "tornado>=6.2,<=6.4",
+    "tornado<=6.4.1,>=6.4.1",
     "typing-extensions>=4.3,<=4.11.0; python_version<'3.11'",
     "urwid>=2.6.14,<=2.6.14",
     "wsproto>=1.0,<=1.2.0",