diff --git a/requirements_dev.txt b/requirements_dev.txt
index 525e767..542a638 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ tox==3.5.2
 coverage==4.5.1
 Sphinx==1.8.1
 cryptography==2.3.1
-PyYAML==3.13
+PyYAML==5.4
 pytest==3.8.2
 numpy==1.15.2
 scipy==1.1.0