diff --git a/setup.py b/setup.py
index 9912ad5..547c642 100644
--- a/setup.py
+++ b/setup.py
@@ -28,6 +28,7 @@ install_requires = [
     'six>=1.5',
     'contextlib2; python_version=="2.7"',
     'mock; python_version=="2.7"',
+    'yarl; python_version>="3.5"',
 ]
 
 excluded_packages = ["tests*"]