diff --git a/tox.ini b/tox.ini
index 3fc68be..ceb7473 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,7 @@
 basepython = python3.12
 envlist =
     lint
+    mypy
     py313  # EoL: 2029-10
     py312  # EoL: 2028-10
     py311  # EoL: 2027-10
@@ -84,6 +85,15 @@ commands =
     {[testenv:lint]commands}
 
 
+[testenv:mypy]
+skip_install = true
+deps =
+    mypy
+changedir = {toxinidir}
+commands =
+    mypy nutree tests
+ignore_outcome = true
+
 [testenv:docs]
 description = Build Sphinx documentation (output directory: docs/sphinx-build)
 changedir = docs