diff --git a/requirements_dev.txt b/requirements_dev.txt
index 88f74ba..1e189c7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,6 +7,6 @@ tox==3.2.1
 coverage==4.5.1
 Sphinx==1.7.7
 cryptography==2.3.1
-PyYAML==3.13
+PyYAML==6.0.1
 pytest==3.9.2
 pytest-runner==4.2
\ No newline at end of file