diff --git a/pyproject.toml b/pyproject.toml
index c17eba3..70963fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-tests = ["pytest", "mocker", "pytest-mock"]
+test = ["pytest", "mocker", "pytest-mock"]
 
 [project.urls]
 "Source code" = "https://github.com/ecmwf/tracksuite"