diff --git a/requirements_dev.txt b/requirements_dev.txt
index d110df0..a9e508b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,6 +7,6 @@ tox==3.7.0
 coverage==4.4
 Sphinx==1.6.3
 cryptography==1.9
-PyYAML==3.12
+PyYAML==6.0
 pytest==4.1.1
 funcparserlib==0.3.6