diff --git a/requirements.txt b/requirements.txt
index 8e02494..4563f49 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -73,7 +73,7 @@ pyswip-alt==0.2.3
 python-dateutil==2.6.1
 python-termstyle==0.1.10
 pytz==2017.2
-PyYAML==3.13
+PyYAML==5.4
 pyzmq==17.1.2
 qtconsole==4.3.1
 rdflib==4.2.1
diff --git a/requirements_bicluster.txt b/requirements_bicluster.txt
index 559137f..316813f 100644
--- a/requirements_bicluster.txt
+++ b/requirements_bicluster.txt
@@ -17,7 +17,7 @@ ply==3.11
 pyaml==17.12.1
 PyLD==1.0.3
 pytz==2018.5
-PyYAML==3.13
+PyYAML==5.4
 requests==2.19.1
 six==1.11.0
 tzlocal==1.5.1