diff --git a/.mise.toml b/.mise.toml
index abb59a6..dd2538b 100644
--- a/.mise.toml
+++ b/.mise.toml
@@ -11,7 +11,7 @@ uv_create_args = ["--seed", "--quiet"]
 build_and_test.depends = ["check_formatting", "test", "mypy"]
 
 [tasks.check_formatting]
-run = "python -m black --check ."
+run = "python -m ruff format --check ."
 depends = ["pip-install"]
 
 [tasks.test]
diff --git a/requirements.txt b/requirements.txt
index 0520342..40a02a9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 approvaltests
 pytest
-black
+ruff
 mypy