diff --git a/requirements.txt b/requirements.txt
index ad4c21d..42eb781 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ pyparsing==2.2.0
 python-dateutil==2.7.3
 pytz==2018.5
 PyWavelets==0.5.2
-PyYAML==5.1
+PyYAML==5.4
 scikit-image==0.14.0
 scikit-learn==0.19.2
 scipy==1.1.0
diff --git a/requirements_client.txt b/requirements_client.txt
index 0d3028d..f2a16e7 100644
--- a/requirements_client.txt
+++ b/requirements_client.txt
@@ -1,5 +1,5 @@
 numpy==1.15.0
-PyYAML==5.1
+PyYAML==5.4
 requests==2.23
 msgpack-numpy==0.4.5
 pyzmq==19.0.0