1 files changed, 1 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index 0d9ce1a..4741eb7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -43,6 +43,7 @@ install_requires =
     Mako
     importlib-metadata;python_version<"3.9"
     importlib-resources;python_version<"3.9"
+    typing-extensions>=4
 
 [options.extras_require]
 tz =