diff --git a/test-requirements.txt b/test-requirements.txt
index 3d07a84..7614f26 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,4 +6,4 @@ pytest-timeout>=1.0.0
 webtest>=2.0.23,<3.0
 git+git://github.com/inklesspen/protorpc.git@endpoints-dependency#egg=protorpc-0.12.0a0
 protobuf>=3.0.0b3
-PyYAML==3.12
+PyYAML==5.4