diff --git a/monapp/requirement.txt b/monapp/requirement.txt
index e41801f..bfe3bca 100644
--- a/monapp/requirement.txt
+++ b/monapp/requirement.txt
@@ -30,7 +30,7 @@ pyparsing==2.4.7
 PyQt5==5.14.1
 PyQt5-sip==12.7.1
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.1
 rdflib==5.0.0
 selenium==3.141.0
 six==1.14.0
diff --git a/requirements.txt b/requirements.txt
index deadbbf..fd7cc93 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ python-multipart==0.0.5
 pytz==2020.4
 pywinrm==0.3.0
 pyxdg==0.25
-PyYAML==3.13
+PyYAML==5.1
 pyzmq==20.0.0
 rdflib==5.0.0
 requests==2.21.0