diff --git a/requirements.txt b/requirements.txt
index 8180e2e..3af970e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 boto3==1.4.4
 botocore==1.10.12
-PyYAML==3.12
+PyYAML==5.4
 click==6.7
 virtualenv==15.1.0
 colorama==0.3.7
diff --git a/setup.py b/setup.py
index 8a54b25..bd752d2 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
     'chalice>=1.6.0,<2.0.0',
     'click>=6.6,<7.0',
     'pip>=9,<11',
-    'PyYAML>=3.13,<4.0',
+    'PyYAML>=3.13,<6.0',
 ]
 
 setup(