diff --git a/setup.py b/setup.py
index fc365bd..db4d302 100644
--- a/setup.py
+++ b/setup.py
@@ -47,6 +47,6 @@
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
     install_requires=[
-        'h11>=0.9.0,<1',
+        'h11>=0.13.0,<1',
     ],
 )