diff --git a/requirements.txt b/requirements.txt
index 56101b3..eba98a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ websockets==7.0
 pylint==2.2.2
 pytest-asyncio==0.6.0
 six==1.12.0
+pyee==5.0.0