diff --git a/requirements-python2.7-dev.txt b/requirements-python2.7-dev.txt
index 6b675514de0..1691496e493 100644
--- a/requirements-python2.7-dev.txt
+++ b/requirements-python2.7-dev.txt
@@ -20,7 +20,7 @@ pymemcache==1.3.5
 PyMySQL==0.7.5
 pytest-cov==2.2.1
 pytest==2.9.2
-PyYAML==3.11
+PyYAML==5.4
 requests[security]==2.10.0
 responses==0.5.1
 sendgrid==3.0.0
diff --git a/requirements-python3.4-dev.txt b/requirements-python3.4-dev.txt
index 325fc6b13e0..4d7306c83ba 100644
--- a/requirements-python3.4-dev.txt
+++ b/requirements-python3.4-dev.txt
@@ -18,7 +18,7 @@ pymemcache==1.3.5
 PyMySQL==0.7.5
 pytest-cov==2.2.1
 pytest==2.9.2
-PyYAML==3.11
+PyYAML==5.4
 requests[security]==2.10.0
 responses==0.5.1
 sendgrid==3.0.0