diff --git a/tox.ini b/tox.ini
index ef6a8ddd..1c1d9428 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ deps=pytest>4.6
      sqlalchemy: sqlalchemy>=1.3.0
      mako
      backports.zoneinfo;python_version<"3.9"
+     tzdata
      zimports
      black==23.3.0
      greenlet>=1