diff --git a/pyproject.toml b/pyproject.toml
index dd1b70ae..1d809766 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,7 @@ dependencies = [
   "pandas",
   "Pillow",
   "polars",
+  "polars-lts-cpu",
   "pydot",
   "pytest",
   "pytest-cov",