diff --git a/requirements.txt b/requirements.txt
index 8e96db7..11a1ff1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,4 +32,4 @@ txaio==2.9.0
 urllib3==1.22
 Werkzeug==0.14.1
 yarl==1.1.1
-pyudev==0.21.1
+pyudev==0.21.0