diff --git a/pyproject.toml b/pyproject.toml
index 80864e57..15863eb5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,6 +49,7 @@ dependencies = [
     "pyyaml>=6.0,<7.0.0",
     "filelock>=3.25.2",
     "packaging>=24.0",
+    "tzdata>=2025.2; sys_platform == 'win32'",
     "defusedxml>=0.7.1,<1.0.0",
     "pypdf>=5.0.0,<6.0.0",
     "python-docx>=1.1.0,<2.0.0",
diff --git a/tests/channels/test_channel_plugins.py b/tests/channels/test_channel_plugins.py
index f2d64666..345ac6c0 100644
--- a/tests/channels/test_channel_plugins.py
+++ b/tests/channels/test_channel_plugins.py
@@ -1552,6 +1552,7 @@ def test_optional_dependency_metadata_for_enable():
     ):
         assert not any(dep.startswith(dep_name) for dep in required)
     for dependency in (
+        "tzdata>=2025.2; sys_platform == 'win32'",
         "defusedxml>=0.7.1,<1.0.0",
         "pypdf>=5.0.0,<6.0.0",
         "python-docx>=1.1.0,<2.0.0",