diff --git a/tools/pdtools/requirements.txt b/tools/pdtools/requirements.txt
index 7e89dd79..0be7025a 100644
--- a/tools/pdtools/requirements.txt
+++ b/tools/pdtools/requirements.txt
@@ -11,7 +11,7 @@ GitPython==2.1.5
 idna==2.8
 jsonschema==2.6.0
 python-dateutil==2.7.5
-PyYAML==5.1
+PyYAML==5.4
 requests==2.21.0
 six==1.10.0
 smmap2==2.0.3