diff --git a/pyproject.toml b/pyproject.toml
index 3563603..a97c5ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -145,6 +145,7 @@ exclude = ['src/**/*.sh']
 
 [tool.flit.module]
 name = "google.adk"
+include = ["py.typed"]
 
 [tool.isort]
 profile = "google"