diff --git a/pyproject.toml b/pyproject.toml
index ee8ad57b..8100a48c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 
 dependencies = [
     "blinker>=1.4,<2",
-    "cachetools>=4.1,<5",
+    "cachetools>=4.1,<6",
     "debts>=0.5,<1",
     "email_validator>=1.0,<3",
     "Flask-Babel>=1.0,<4",