diff --git a/events/requirements.txt b/events/requirements.txt
index 2102c2b9a..e4d8fe3a6 100644
--- a/events/requirements.txt
+++ b/events/requirements.txt
@@ -1,2 +1,3 @@
+aiohttp==3.6.2
 -e ../tools #egg=code-coverage-tools
 libmozevent==1.1.0