diff --git a/requirements_dev.txt b/requirements_dev.txt
index 09890bc..eb3fc9e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,5 +8,5 @@ coverage==4.5.3
 Sphinx==3.2.1
 pygments==2.2.0
 cryptography==2.4.1
-PyYAML==5.3.1
+PyYAML==6.0
 pytest==3.8.0