diff --git a/requirements_dev.txt b/requirements_dev.txt
index f8491f3..76c968f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ tox==2.9.1
 coverage==4.5.1
 Sphinx==1.7.1
 cryptography==2.1.4
-PyYAML==3.12
+PyYAML==5.4
 pytest==3.4.2
 pytest-runner==4.0