diff --git a/requirements-dev.txt b/requirements-dev.txt
index caac8d5..cb8537c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,4 @@
+aiohttp<3.6
 bottle
 bravado-core>=4.11.0
 bravado[integration-tests]>=10.4.1