diff --git a/pyproject.toml b/pyproject.toml
index e0e118f5c..cf3c23c0d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ dependencies = [
     "unidecode>=1.3.7",
     "backports-zoneinfo>=0.2.1; python_version < \"3.9\"",
     "watchfiles>=0.21.0",
+    "tzdata; sys_platform == 'win32'",
 ]
 
 [project.optional-dependencies]