diff --git a/doc/requirements.txt b/doc/requirements.txt
index d8c3cfb..8871238 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,4 +2,4 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 openstackdocstheme>=1.18.1 # Apache-2.0
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3491ab1..97b4734 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -62,7 +62,7 @@ python-novaclient==9.1.0
 python-openstackclient==3.12.0
 python-subunit==1.0.0
 pytz==2013.6
-PyYAML==3.10
+PyYAML==3.12
 requests==2.14.2
 requestsexceptions==1.2.0
 rfc3986==0.3.1
diff --git a/requirements.txt b/requirements.txt
index 4b4d4e8..1caa6c0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,6 @@ oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 python-openstackclient>=3.12.0 # Apache-2.0
-PyYAML>=3.10 # MIT
+PyYAML>=3.12 # MIT
 requests>=2.14.2 # Apache-2.0
 six>=1.10.0 # MIT