diff --git a/requirements.txt b/requirements.txt
index 837c40a..d86040f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 pbr>=0.11
-extras
+extras>=1.0.0
 fixtures>=1.3.0
 # 'mimeparse' has not been uploaded by the maintainer with Python3 compat
 # but someone kindly uploaded a fixed version as 'python-mimeparse'.