diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1635ba8..0d58ac2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,6 +8,6 @@ coverage==4.5.1
 Sphinx==1.6.7
 twine==1.9.1
 cryptography==2.1.4
-PyYAML==3.12
+PyYAML==5.3
 pytest==3.4.0
 pytest-runner==4.0