diff --git a/requirements_dev.txt b/requirements_dev.txt
index bed373f..17a062f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,6 +2,6 @@ bumpversion==0.5.3
 coverage==4.5.4
 flake8==3.7.9
 pytest==5.3.1
-pytz==2019.3
+pytz==2023.3
 Sphinx==2.2.2
 tox==3.14.2