diff --git a/requirements.txt b/requirements.txt
index bb83ef94..26812215 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,4 @@ tox==3.7.0
 Sphinx==1.8.3
 twine==1.12.1
 cryptography==2.5
-PyYAML==3.13
+PyYAML==5.3.1