diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index a0641b2e..afc1bfc6
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ pyflakes==1.6.0
 pylint==1.7.6
 #pypcap>=1.1.5
 pyOpenSSL==17.3.0
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.4
 scapy==2.3.3
 service-identity==17.0.0