diff --git a/lower-constraints.txt b/lower-constraints.txt
index 91e6cf05..029b96a3 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -14,7 +14,7 @@ fasteners==0.7.0
 fixtures==3.0.0
 gitdb==0.6.4
 GitPython==1.0.1
-greenlet==0.4.10
+greenlet==0.4.15
 imagesize==0.7.1
 iso8601==0.1.11
 Jinja2==2.10
@@ -44,7 +44,7 @@ python-dateutil==2.5.3
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6
-PyYAML==3.12
+PyYAML==3.13
 repoze.lru==0.7
 requests==2.14.2
 requestsexceptions==1.2.0
diff --git a/requirements.txt b/requirements.txt
index 6956e129..ffe8f4e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ WebOb>=1.7.1 # MIT
 debtcollector>=1.2.0 # Apache 2.0
 eventlet>=0.25.2 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
-greenlet>=0.4.10 # MIT
+greenlet>=0.4.15 # MIT
 oslo.utils>=3.40.2 # Apache-2.0
 oslo.concurrency>=3.25.0 # Apache-2.0
 oslo.config>=5.1.0 # Apache-2.0