diff --git a/requirements_dev.txt b/requirements_dev.txt
index 4f93ea0..6ca5b5f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,7 +8,7 @@ tox==2.3.1
 coverage==4.1
 Sphinx==1.4.8
 cryptography==1.7
-PyYAML==3.11
+PyYAML==5.4
 pytest-runner==2.11.1
 pytest==3.0.7
 pytest-cov==2.4.0