diff --git a/requirements.txt b/requirements.txt
index 0fb97eb..4440822 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ Sphinx==1.6.4
 flake8==3.4.1
 coverage==4.4.1
 cryptography==2.0.3
-PyYAML==3.12
+PyYAML==5.4
 scikit-learn==0.19.0
 pytest==3.2.2
 matplotlib==2.0.2