diff --git a/pyproject.toml b/pyproject.toml
index ba374f7a..5ccc497a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ test = [
     "pytest",
     "pytest-cov",
     "pytest-mock",
-    "pytz==2023.3.post1",
+    "pytz==2021.1",
     "simplejson==3.*",
 ]
 doc = [
diff --git a/requirements/requirements-tests.txt b/requirements/requirements-tests.txt
index b904d55b..77005e0b 100644
--- a/requirements/requirements-tests.txt
+++ b/requirements/requirements-tests.txt
@@ -4,5 +4,5 @@ pre-commit
 pytest
 pytest-cov
 pytest-mock
-pytz==2023.3.post1
+pytz==2021.1
 simplejson==3.*