diff --git a/cfg/__init__.py b/cfg/__init__.py
index 60ec0bd..08d358d 100644
--- a/cfg/__init__.py
+++ b/cfg/__init__.py
@@ -1,10 +1,8 @@
 """Python Configuration System"""
 from __future__ import annotations
 
-from .errors import *
 from .helpers import get_output_dir
-from .interfaces import *
-from .leaf import *
-from .node import *
+from .leaf import CL
+from .node import CN
 
 __version__ = "3.1.2"
diff --git a/pyproject.toml b/pyproject.toml
index 55408e9..bd2c1f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,3 +51,28 @@ version_variable = "ntc/__init__.py:__version__"
 minversion = "6.0"
 addopts = "--doctest-modules"
 
+[tool.ruff]
+target-version = "py312"
+line-length = 120
+[tool.ruff.lint]
+preview = true
+select = [
+    "A", "B",  "E", "F", "I", "N", "R", "S",  "Q", "W",
+    "ARG", "BLE", "C4", "COM", "ERA", "FBT", "FIX", "FLY", "FURB", "IC", "INP", "ISC",
+    "LOG", "NPY", "PERF", "PIE", "PT", "PTH", "RET", "RSE", "SIM", "SLF", "T20", "TCH",
+    "TD", "TID", "TRY", "UP"
+]
+# Allow fix for all enabled rules (when `--fix`) is provided.
+fixable = ["ALL"]
+ignore = ["UP035", "RET503", "S113", "TD002", "TD003", "N817", "FIX002", "TRY003",
+    "UP007", "A003", "PTH123", "E203",
+]
+[tool.ruff.per-file-ignores]
+"tests/**/*.py" = [
+    "S101", # Asserts in tests are fine
+    "T201", # Prints are useful for debugging
+    "E501", # Test strings can be long
+]
+"**/__init__.py" = [
+    "F401", # Allow unused imports in module files
+]