diff --git a/setup.py b/setup.py
index 2d36c70..4ec5c51 100644
--- a/setup.py
+++ b/setup.py
@@ -77,7 +77,7 @@ install_requires = [
     "trio>=0.13.0",
     "async-service>=0.1.0a4",
     "async-exit-stack==1.0.1",
-    "trio-typing>=0.3.0,<1.0.0",
+    "trio-typing>=0.3.0,<0.4.0",
 ]