diff --git a/requirements.txt b/requirements.txt
index 697e209..d4cc855 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -94,7 +94,7 @@ PySocks==1.7.1
 python-dateutil==2.8.0
 pytz==2019.2
 PyWavelets==1.0.3
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.1.0
 rebound==3.10.1
 regex==2019.8.19