diff --git a/pyproject.toml b/pyproject.toml
index f487f312..0c5af635 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ packages = ["tsfm_public", "tsfm_public.toolkit", "tsfmhfdemos"]
 
 notebooks = ["jupyter", "matplotlib", "datasets", "ipywidgets", "plotly", "kaleido"]
 testing = ["pytest", "tsfm_public[notebooks]"]
-dev = ["pre-commit", "tsfm_public[testing]", "ruff"]
+dev = ["pre-commit", "tsfm_public[testing]", "ruff==0.1.5"]
 evaluation = [
     "tsevaluate @ git+ssh://git@github.ibm.com/srom/tsevaluate.git",
 ]