diff --git a/requirements.txt b/requirements.txt
index 214f26b..63138d0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 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
 oslo.config>=4.6.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.28.0 # Apache-2.0