diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 7962bec..717c93d
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 boto3>=1.2.3
 placebo==0.4.3
 six>=1.9.0
-PyYAML==3.13
+PyYAML==5.4
 python-dateutil>=2.1,<3.0.0
 mock==1.0.1
 nose==1.3.4