diff --git a/pyproject.toml b/pyproject.toml
index 1381b58..397dcf5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,4 +4,7 @@ version = "1.2.3"
 # ...
 dependencies = [
     "httpx"
-]
\ No newline at end of file
+]
+
+[tool.setuptools]
+packages = ["testlib"]
\ No newline at end of file