diff --git a/requirements.txt b/requirements.txt
index dd3b26e..0978be4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,9 +8,9 @@ oslo.context>=0.2.0                     # Apache-2.0
 oslo.i18n>=1.5.0  # Apache-2.0
 oslo.serialization>=1.4.0               # Apache-2.0
 oslo.utils>=1.4.0                       # Apache-2.0
-pbr>=0.6,!=0.7,<1.0
+pbr>=0.11,<2.0
 pycadf>=0.8.0
 python-keystoneclient>=1.3.0
-requests>=2.2.0,!=2.4.0
+requests>=2.5.2
 six>=1.9.0
 WebOb>=1.2.3