diff --git a/requirements.txt b/requirements.txt
index d5388ec8..8e0369e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.utils>=3.28.0 # Apache-2.0
 oslo.concurrency>=3.20.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
-enum34;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
+enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 
 eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
 six>=1.9.0 # MIT