diff --git a/requirements.txt b/requirements.txt
index d2ee6fd..33f9008 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,9 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-pbr>=1.6 # Apache-2.0
+pbr>=1.8 # Apache-2.0
 
 anyjson>=0.3.3 # BSD
 pystache # MIT
-PyYAML>=3.1.0 # MIT
+PyYAML>=3.10.0 # MIT
 six>=1.9.0 # MIT
diff --git a/test-requirements.txt b/test-requirements.txt
index 449a9fd..bb445cb 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,11 +3,11 @@
 # process, which may cause wedges in the gate later.
 hacking<0.10,>=0.9.2
 
-coverage>=3.6 # Apache-2.0
+coverage>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0 # BSD
 python-subunit>=0.0.18 # Apache-2.0/BSD
-sphinx!=1.3b1,<1.3,>=1.2.1 # BSD
+sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT