diff --git a/setup.py b/setup.py
index f6798c2..054ffca 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@
         'testing',
         'trio',
     ],
-    python_requires=">=3.5",
+    python_requires=">=3.6",
     classifiers=[
         "License :: OSI Approved :: MIT License",
         "License :: OSI Approved :: Apache Software License",