diff --git a/lower-constraints.txt b/lower-constraints.txt
index d736269..bb0445e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -11,7 +11,7 @@ eventlet==0.18.2
 extras==1.0.0
 fixtures==3.0.0
 flake8==2.2.4
-greenlet==0.4.10
+greenlet==0.4.15
 hacking==0.10.0
 imagesize==0.7.1
 iso8601==0.1.11
@@ -31,7 +31,7 @@ Pygments==2.2.0
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6
-PyYAML==3.12
+PyYAML==3.13
 requests==2.14.2
 requestsexceptions==1.2.0
 restructuredtext-lint==1.1.1