diff --git a/requirements.txt b/requirements.txt
index a50cfc41..31b3575a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 pbr>=0.5.22,!=0.5.23,<1.0
 pywin32
+comtypes
 wmi
 iso8601
 eventlet