diff --git a/pyproject.toml b/pyproject.toml
index 95cd55b..ad06c0c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,9 @@ dependencies = [
     "garminconnect",
 ]
 
+[project.optional-dependencies]
+dev = ["pytest"]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"