diff --git a/justfile b/justfile
index e37cddd..f3d87a4 100644
--- a/justfile
+++ b/justfile
@@ -13,3 +13,18 @@ run *args: _ensure_tools
 # Run with verbose logging
 verbose *args: _ensure_tools
     @uv run -m donglora_mux --verbose {{args}}
+
+# Run all checks (fmt, lint)
+check: fmt-check lint
+
+# Format code
+fmt: _ensure_tools
+    @uv run ruff format .
+
+# Check formatting without changing files
+fmt-check: _ensure_tools
+    @uv run ruff format --check .
+
+# Lint
+lint: _ensure_tools
+    @uv run ruff check .
diff --git a/pyproject.toml b/pyproject.toml
index 8ff3dea..63bcece 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,9 @@ dependencies = [
 [project.scripts]
 donglora-mux = "donglora_mux:main"
 
+[dependency-groups]
+dev = ["ruff"]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"