diff --git a/py-polars/pyproject.toml b/py-polars/pyproject.toml
index fed084292021..98272d97be2a 100644
--- a/py-polars/pyproject.toml
+++ b/py-polars/pyproject.toml
@@ -71,7 +71,7 @@ cloudpickle = ["cloudpickle"]
 graph = ["matplotlib"]
 plot = ["altair >= 5.4.0"]
 style = ["great-tables >= 0.8.0"]
-timezone = ["backports.zoneinfo; python_version < '3.9'", "tzdata; platform_system == 'Windows'"]
+timezone = ["backports.zoneinfo; python_version < '3.9'", "tzdata==2024.1; platform_system == 'Windows'"]
 
 # GPU Engine
 gpu = ["cudf-polars-cu12"]
diff --git a/py-polars/requirements-dev.txt b/py-polars/requirements-dev.txt
index 9d0a2df292cb..0c8bd6429f41 100644
--- a/py-polars/requirements-dev.txt
+++ b/py-polars/requirements-dev.txt
@@ -24,7 +24,7 @@ pydantic>=2.0.0
 numba
 # Datetime / time zones
 backports.zoneinfo; python_version < '3.9'
-tzdata; platform_system == 'Windows'
+tzdata==2024.1; platform_system == 'Windows'
 # Database
 sqlalchemy
 adbc-driver-manager; python_version >= '3.9' and platform_system != 'Windows'