diff --git a/requirements_dev.txt b/requirements_dev.txt
index f9aca75..b9ad4aa 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ pip==19.3.1
 pytest==5.2.2
 pytest-runner==5.2
 pytest-subtests==0.2.1
-pytz==2019.3
+pytz==2023.4
 PyYAML==5.1.2
 tox==3.14.0
 tox-pyenv==1.1.0