diff --git a/setup.cfg b/setup.cfg
index f06f916..c91e9bc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ packages =
     zope-stubs
 package_dir = =src
 install_requires =
-    mypy>=1.0.0,<1.8.0
+    mypy>=1.0.0,<1.9.0
     zope.interface
     zope.schema
 include_package_data = True