diff --git a/requirements.txt b/requirements.txt
index 27887fc..c2afbb1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 scipy==1.1.0
 scikit_learn==0.20.2
-PyYAML==3.13
+PyYAML==5.1