diff --git a/Makefile b/Makefile
index 0ccaeaaa35..09d05424a4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,5 @@
 SHELL = /bin/bash
 
-export PIP_USE_PEP517 := false
-
 VENV_PATH = .venv
 
 help:
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 6bac9d601e..0000000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,15 +0,0 @@
-[tool.black]
-exclude = '''
-/(
-    \.git
-  | \.hg
-  | \.mypy_cache
-  | \.tox
-  | \.venv
-  | _build
-  | buck-out
-  | build
-  | dist
-  | checkouts
-)/
-'''
diff --git a/tox.ini b/tox.ini
index 762a7c2583..0dc3795a17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -131,7 +131,6 @@ deps =
     linters: mypy
 setenv =
     PYTHONDONTWRITEBYTECODE=1
-    PIP_USE_PEP517=false
     TESTPATH=tests
     django: TESTPATH=tests/integrations/django
     flask: TESTPATH=tests/integrations/flask