diff --git a/python/ruff-ecosystem/pyproject.toml b/python/ruff-ecosystem/pyproject.toml
index 1183bcc8f8..3009f975a8 100644
--- a/python/ruff-ecosystem/pyproject.toml
+++ b/python/ruff-ecosystem/pyproject.toml
@@ -5,6 +5,7 @@ build-backend = "hatchling.build"
 [project]
 name = "ruff-ecosystem"
 version = "0.0.0"
+dependencies = ["unidiff==0.7.5"]
 
 [project.scripts]
 ruff-ecosystem = "ruff_ecosystem.cli:entrypoint"