diff --git a/tox.ini b/tox.ini
index 8495db2..7362472 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,30 +1,38 @@
 [tox]
-envlist=flake8,py3
+envlist=flake8,py3,mypy
 
 [testenv:py3]
 deps =
   .[testing]
   pytest-cov
   pifpaf
 setenv =
   LC_ALL=C.UTF-8
   LC_CTYPE=C.UTF-8
   LANG=C.UTF-8
 commands =
   pifpaf run postgresql -- pytest --doctest-modules --hypothesis-profile=fast --cov=swh --cov-branch {posargs}
 
 [testenv:py3-slow]
 deps =
   .[testing]
   pytest-cov
   pifpaf
 commands =
   pifpaf run postgresql -- pytest --doctest-modules --hypothesis-profile=slow --cov=swh --cov-branch {posargs}
 
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8
+
+[testenv:mypy]
+skip_install = true
+deps =
+  .[testing]
+  mypy
+commands =
+  mypy swh