diff --git a/requirements_dev.txt b/requirements_dev.txt
index d292be2..af9d107 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,5 +5,5 @@ watchdog==0.8.3
 coverage==4.1
 Sphinx==1.4.8
 cryptography==1.7
-PyYAML==3.11
+PyYAML==5.4
 pytest==2.9.2