diff --git a/pyproject.toml b/pyproject.toml
index 5b64fd6..30bacbb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,3 +63,10 @@ ignore = ["E501", "E701", "E741", "UP031"]
 [tool.ruff.lint.per-file-ignores]
 "unittest2pytest/fixes/fix_remove_class.py" = ["W291"]
 "unittest2pytest/fixes/fix_self_assert.py" = ["F841"]
+
+[tool.tox]
+env_list = ["py39", "py310", "py311", "py312", "py313", "py314", "py315"]
+
+[tool.tox.env_run_base]
+deps = ["pytest"]
+commands = [["pytest", "{posargs}"]]
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 78c9144..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-# Tox (https://tox.readthedocs.io) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
-[tox]
-envlist = py39, py310, py311, py312, py313, py314, py315
-
-[testenv]
-deps =
-    pytest
-commands = pytest {posargs}