diff --git a/cpp_linter_hooks/util.py b/cpp_linter_hooks/util.py
index 7e652d0..8969d7b 100644
--- a/cpp_linter_hooks/util.py
+++ b/cpp_linter_hooks/util.py
@@ -20,10 +20,9 @@ def get_version_from_dependency(tool: str) -> Optional[str]:
         return None
     with open(pyproject_path, "rb") as f:
         data = tomllib.load(f)
-    # Check build-system.requires
-    build_system = data.get("build-system", {})
-    requires = build_system.get("requires", [])
-    for dep in requires:
+    # Check [project].dependencies
+    dependencies = data.get("project", {}).get("dependencies", [])
+    for dep in dependencies:
         if dep.startswith(f"{tool}=="):
             return dep.split("==")[1]
     return None
diff --git a/pyproject.toml b/pyproject.toml
index 2e66bcd..f27e447 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=45", "setuptools-scm", "clang-format==21.1.0", "clang-tidy==21.1.0"]
+requires = ["setuptools>=45", "setuptools-scm"]
 build-backend = "setuptools.build_meta"
 
 requires-python = ">=3.9"
@@ -34,6 +34,8 @@ classifiers = [
 dependencies = [
     "tomli>=1.1.0; python_version < '3.11'",
     "setuptools>=45.0.0", # Required for pkg_resources in clang-tidy
+    "clang-format==21.1.0",
+    "clang-tidy==21.1.0",
 ]
 dynamic = ["version"]
 
diff --git a/tests/test_util.py b/tests/test_util.py
index 0c73714..9ce5b21 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -25,14 +25,13 @@
 def test_get_version_from_dependency_success():
     """Test get_version_from_dependency with valid pyproject.toml."""
     mock_toml_content = {
-        "build-system": {
-            "requires": [
+        "project": {
+            "dependencies": [
                 "clang-format==20.1.7",
                 "clang-tidy==20.1.0",
                 "other-package==1.0.0",
             ]
-        },
-        "project": {},
+        }
     }
 
     with (
@@ -57,7 +56,7 @@ def test_get_version_from_dependency_missing_file():
 @pytest.mark.benchmark
 def test_get_version_from_dependency_missing_dependency():
     """Test get_version_from_dependency with missing dependency."""
-    mock_toml_content = {"build-system": {"requires": ["other-package==1.0.0"]}}
+    mock_toml_content = {"project": {"dependencies": ["other-package==1.0.0"]}}
 
     with (
         patch("pathlib.Path.exists", return_value=True),