diff --git a/pyproject.toml b/pyproject.toml
index 735b017b774..0c71b4acb60 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -124,7 +124,7 @@ ignore-fully-untyped = true
 mypy-init-return = true
 
 [tool.ruff.lint.isort]
-known-first-party = ["astropy", "extension_helpers"]
+known-first-party = ["tardis", "carsus", "stardis"]
 
 [tool.ruff.lint.pydocstyle]
 convention = "numpy"