diff --git a/pyproject.toml b/pyproject.toml
index 4af70aec3..659ce1984 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -99,7 +99,7 @@ include_trailing_comma = true
 force_grid_wrap = 0
 use_parentheses = true
 line_length = 88
-known_third_party = ["cairo", "gaphas", "generic", "gi", "importlib_metadata", "pytest", "recommonmark", "setuptools", "tomlkit", "typing_extensions"]
+known_third_party = ["cairo", "gaphas", "generic", "gi", "importlib_metadata", "pytest", "recommonmark", "tomlkit", "typing_extensions"]
 skip = "flatpak,.venv,build,dist"
 skip_glob = "gaphor/diagram/general/__init__.py,gaphor/UML/__init__.py,gaphor/UML/*/__init__.py"
 filter_files = true
diff --git a/utils/install_lib.py b/utils/install_lib.py
deleted file mode 100644
index 16f70975a..000000000
--- a/utils/install_lib.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from setuptools.command.install_lib import install_lib as _install_lib
-
-
-class install_lib(_install_lib):
-    def build(self):
-        _install_lib.build(self)
-        self.run_command("build_uml")
-        self.run_command("build_mo")