diff --git a/PyStacks/setup.py b/PyStacks/setup.py
index edabd73..0d48280 100644
--- a/PyStacks/setup.py
+++ b/PyStacks/setup.py
@@ -12,7 +12,7 @@
     install_requires=[
         'boto3==1.4.7',
         'botocore>=1.8.26',
-        'PyYAML==3.12',
+        'PyYAML==5.4',
         'invoke==0.14.0',
         'Jinja2==2.8',
         'pynt==0.8.1',