diff --git a/pyproject.toml b/pyproject.toml
index 73439ff1..13bdc5ba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=40.8.0", "wheel", "setuptools_scm"]
+requires = ["setuptools>=42", "wheel", "setuptools_scm", "cmake", "pybind11"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]
diff --git a/setup.py b/setup.py
index 851ca26a..42902847 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,4 @@
 import os
-import re
 import sys
 import subprocess