diff --git a/requirements.txt b/requirements.txt
index 18b497c7..e48774ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@
 
 pbr!=2.1.0,>=2.0.0 # 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
 netaddr>=0.7.18 # BSD
 tenacity>=3.2.1 # Apache-2.0