diff --git a/changelog.d/pr421.trivial.rst b/changelog.d/pr421.trivial.rst
new file mode 100644
index 00000000..b00b9e55
--- /dev/null
+++ b/changelog.d/pr421.trivial.rst
@@ -0,0 +1,2 @@
+Insert mypy configuration into :file:`pyproject.toml` and remove
+config options from :file:`tox.ini`.
diff --git a/pyproject.toml b/pyproject.toml
index e26c034c..64c9a32c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,14 @@ requires = [
 build-backend = "setuptools.build_meta"
 
 
+[tool.mypy]
+# ignore_missing_imports = true
+check_untyped_defs = true
+show_error_codes = true
+# strict = true
+pretty = true
+
+
 [tool.black]
 line-length = 88
 target-version = ['py37', 'py38', 'py39', 'py310', 'py311']
diff --git a/tox.ini b/tox.ini
index b18aa1f7..1bc77e1b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,7 +49,7 @@ commands = flake8 {posargs:}
 description = Check code style
 basepython = python3
 deps = mypy
-commands = mypy {posargs:--ignore-missing-imports --check-untyped-defs src}
+commands = mypy {posargs:src}
 
 
 [testenv:docstrings]