diff --git a/dev-requirements.txt b/dev-requirements.txt
index a6c5883..b9b2408 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,4 +3,4 @@ pytest==3.2.3
 pytest-cov==2.5.1
 pytest-flask==0.10.0
 flasgger==0.9.1
-PyYAML==3.13
+PyYAML==5.1