diff --git a/setup.cfg b/setup.cfg
index 8cdfe539..ffac7970 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -24,7 +24,7 @@ include_package_data = True
 zip_safe = False
 install_requires =
     blinker>=1.4,<2
-    cachetools>=4.1,<5
+    cachetools>=4.1,<6
     debts>=0.5,<1
     email_validator>=1.0,<2
     Flask-Babel>=1.0,<3