diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7d45088..a93d86f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,6 +6,6 @@ tox==2.1.1
 coverage==4.0
 Sphinx==1.3.1
 cryptography==1.0.1
-PyYAML==3.11
+PyYAML==5.1
 pandas>=0.16.2
 bottle>=0.12.9