Now depends on Kombu 2.5.4

requirements/default.txt

@@ -1,3 +1,3 @@
 billiard>=2.7.3.19,<3.0
 python-dateutil>=1.5,<2.0
-kombu>=2.5.3,<3.0
+kombu>=2.5.4,<3.0

setup.cfg

@@ -16,4 +16,4 @@ upload-dir = docs/.build/html
 [bdist_rpm]
 requires = billiard >= 2.7.3.19
            python-dateutil >= 1.5
-           kombu >= 2.5.3
+           kombu >= 2.5.4