diff --git a/DTI-CDF_requirements.txt b/DTI-CDF_requirements.txt
index 1f01fd2..436335a 100644
--- a/DTI-CDF_requirements.txt
+++ b/DTI-CDF_requirements.txt
@@ -63,7 +63,7 @@ PyPDF2==1.25.1
 pyrsistent==0.14.11
 python-dateutil==2.7.5
 pytz==2018.7
-PyYAML==3.13
+PyYAML==5.1
 pyzmq==18.0.0
 scandir==1.10.0
 scikit-learn==0.20.1