diff --git a/pyproject.toml b/pyproject.toml
index e3c5592fe..673dfb2e3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -160,21 +160,3 @@ flake8-black = ["-BLK901"]
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
-
-[tool.tox]
-# see: https://tox.wiki/en/latest/example/basic.html
-legacy_tox_ini = """
-[tox]
-envlist = py
-isolated_build = True
-
-[testenv]
-deps =
-  pytest >= 6.2
-  pytest-bdd >=4.0.1,<6.0
-  pytest-xdist >=2.5.0
-  toml >=0.10
-
-commands = pytest {posargs}
-passenv = HOME
-"""
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 000000000..4f8561195
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,19 @@
+# We would prefer to use pyproject.toml to configure
+# tox, but it's not properly supported, yet. Check
+# back on this once tox v4 is out.
+# see: https://github.com/tox-dev/tox/issues/999
+# see: https://github.com/tox-dev/tox/issues/814
+# see: https://tox.wiki/en/latest/example/basic.html
+[tox]
+envlist = py
+isolated_build = True
+
+[testenv]
+deps =
+  pytest >= 6.2
+  pytest-bdd >=4.0.1,<6.0
+  pytest-xdist >=2.5.0
+  toml >=0.10
+
+commands = pytest {posargs}
+passenv = HOME