diff --git a/pyproject.toml b/pyproject.toml
index a2a2b65..dd481c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,6 +32,7 @@ keywords = []
 dependencies = [
     "pyyaml>=6",
     "typer>=0.9",
+    "typing_extensions>=4.1; python_version < '3.12'",
 ]
 
 [project.scripts]