diff --git a/requirements.txt b/requirements.txt
index 6890533..07d3bb3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ pytest-cov>=2.12.1
 coverage==5.5
 sphinxcontrib-websupport==1.1.2       # latest version with py 2.7 support
 Sphinx==1.8.5
-PyYAML==5.1.2
+PyYAML==5.4
 yamldirs>=1.0.9
 typing==3.6.4