Now depends on kombu 3.0.21

requirements/default.txt

@@ -1,3 +1,3 @@
 pytz>dev
 billiard>=3.3.0.17,<3.4
-kombu>=3.0.19,<3.1
+kombu>=3.0.21,<3.1

setup.cfg

@@ -12,7 +12,7 @@ upload-dir = docs/.build/html
 [bdist_rpm]
 requires = pytz >= 2011b
            billiard >= 3.3.0.17
-           kombu >= 3.0.19
+           kombu >= 3.0.21
 
 [wheel]
 universal = 1