diff --git a/Api 1.0/requirements.txt b/Api 1.0/requirements.txt
index 52bc717..a4ca60f 100644
--- a/Api 1.0/requirements.txt	
+++ b/Api 1.0/requirements.txt	
@@ -52,7 +52,7 @@ Pygments==2.3.1
 pyparsing==2.4.0
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.4.3
 requests==2.21.0