diff --git a/legacy/requirements.txt b/legacy/requirements.txt
index fd5b57e..c666355 100644
--- a/legacy/requirements.txt
+++ b/legacy/requirements.txt
@@ -51,7 +51,7 @@ psutil==5.4.3
 pyasn1==0.4.2
 pyasn1-modules==0.2.1
 pytz==2018.3
-PyYAML==3.12
+PyYAML==5.1
 requests==2.18.4
 rsa==3.4.2
 six==1.11.0