diff --git a/requirements_dev.txt b/requirements_dev.txt
index d89621b..87795d4 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ tox==3.14.2
 flake8==3.7.9
 setuptools-scm==3.3.3
 pytest==4.6.8
-PyYAML==5.1.2
+PyYAML==6.0.2
 cryptography==2.8
 Sphinx==1.8.5
 coverage==4.5.4