diff --git a/mega_applications/flask_web_app/requirements.txt b/mega_applications/flask_web_app/requirements.txt
index dd37af3..ff7754e 100644
--- a/mega_applications/flask_web_app/requirements.txt
+++ b/mega_applications/flask_web_app/requirements.txt
@@ -113,7 +113,7 @@ pyOpenSSL==17.5.0
 pyparsing==2.1.10
 python-dateutil==2.6.1
 pytz==2014.4
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==16.0.2
 requests==2.20.0
 requests-file==1.4.2