diff --git a/setup.py b/setup.py
index be2ffdb..d636075 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@
         "trio >= 0.16.0",
         "typing_extensions >= 3.7.4",
         "mypy_extensions >= 0.4.2",
+        "async_generator",
         "packaging",
         "importlib-metadata",
     ],