diff --git a/README.rst b/README.rst
index 1b1bedd..4ff1a94 100644
--- a/README.rst
+++ b/README.rst
@@ -55,6 +55,7 @@ record with the highest weight will be selected for connecting to Postgres.
 
 Requirements
 ------------
+- `aiodns <https://github.com/saghul/aiodns>`_
 - `aiopg <https://aioboto3.readthedocs.io/en/latest/>`_
 - `sprockets.http <https://sprocketshttp.readthedocs.io/en/master/>`_
 - `Tornado <https://tornadoweb.org>`_
diff --git a/setup.cfg b/setup.cfg
index 0f44aff..d63605c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -34,7 +34,7 @@ keywords =
 include_package_data = True
 install_requires =
     aiopg>=1.0.0,<2
-    aiodns
+    aiodns>=2,<3
     sprockets.http>=2.1.1,<3
     tornado>=6,<7
 py_modules =