diff --git a/setup.py b/setup.py
index de7a6c3..7492d63 100755
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@ setup(
     install_requires=[
 
         # trio related
-        'trio>0.8',
+        'trio >= 0.20',
         'async_generator',
         'trio_typing',