diff --git a/requirements.txt b/requirements.txt
index c8de600..ddbd0b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ gitdb2==2.0.3
 GitPython==2.1.8
 graphviz==0.8.2
 idna==2.6
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.4
 smmap2==2.0.3
 urllib3==1.22