diff --git a/libraries/botbuilder-integration-aiohttp/setup.py b/libraries/botbuilder-integration-aiohttp/setup.py
index f45e67ec8..e1e06e54b 100644
--- a/libraries/botbuilder-integration-aiohttp/setup.py
+++ b/libraries/botbuilder-integration-aiohttp/setup.py
@@ -9,6 +9,7 @@
     "botbuilder-schema==4.12.0",
     "botframework-connector==4.12.0",
     "botbuilder-core==4.12.0",
+    "yarl<=1.4.2",
     "aiohttp==3.6.2",
 ]