diff --git a/flask-connexion-rest-part-3/requirements.txt b/flask-connexion-rest-part-3/requirements.txt
index c9efff7..495946d 100644
--- a/flask-connexion-rest-part-3/requirements.txt
+++ b/flask-connexion-rest-part-3/requirements.txt
@@ -16,7 +16,7 @@ marshmallow==2.18.0
 marshmallow-sqlalchemy==0.15.0
 openapi-spec-validator==0.2.4
 pathlib==1.0.1
-PyYAML==4.2b4
+PyYAML==5.4
 requests==2.21.0
 six==1.12.0
 SQLAlchemy==1.2.17