diff --git a/requirements_dev.txt b/requirements_dev.txt
index f9aca75..490eb5e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ pytest==5.2.2
 pytest-runner==5.2
 pytest-subtests==0.2.1
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 tox==3.14.0
 tox-pyenv==1.1.0
 watchdog==0.9.0