diff --git a/requirements.txt b/requirements.txt
index fce9076..6faff43 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,6 @@ pytest==3.2.1
 pytest-cov==2.5.1
 mock==1.3.0
 nose==1.3.7
-PyYAML==3.11
+PyYAML==5.1
 vcrpy==1.7.4
 sphinx==1.3.5