diff --git a/setup.py b/setup.py
index d86d9f6..1186ebc 100644
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,7 @@
         install_requires=[
             'aiohttp == 2.3.7',
             'aiohttp_cors == 0.6.0',
+            'yarl == 0.18.0',
             'PyYAML == 3.12',
         ],
         extras_require={