diff --git a/requirements-dev.txt b/requirements-dev.txt
index fea9393..2796232 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -24,7 +24,7 @@ pymdown-extensions==9.3 ; python_version >= '3.7'
 pyparsing==3.0.9 ; python_full_version >= '3.6.8'
 python-dateutil==2.8.2 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 python-markdown-math==0.8
-pytz==2022.7.1
+pytz==2023.4
 pyyaml==6.0
 pyyaml-env-tag==0.1 ; python_version >= '3.6'
 six==1.16.0 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
diff --git a/requirements.txt b/requirements.txt
index 41af2e7..2fc2eb3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ pymdown-extensions==9.3; python_version >= '3.7'
 pyparsing==3.0.9; python_full_version >= '3.6.8'
 python-dateutil==2.8.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 python-markdown-math==0.8
-pytz==2022.5
+pytz==2023.4
 pyyaml==6.0; python_version >= '3.6'
 pyyaml-env-tag==0.1; python_version >= '3.6'
 six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'