diff --git a/requirements.txt b/requirements.txt
index d16abf2..f0e7a73 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,4 @@ watchdog==0.8.3
 tox==3.1.3
 flake8==3.5.0
 Sphinx==1.7.6
-PyYAML==3.13
+PyYAML==5.4