diff --git a/tox.ini b/tox.ini
index 9f36549..4139259 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py3-junit-coverage
+envlist = py3-black-junit-coverage
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/passerelle-montpellier-sig/{env:BRANCH_NAME:}
 
 [testenv]
@@ -22,5 +22,7 @@ deps =
   pytest-cov
   pytest-django
   xmlschema<1.1
+  black: pre-commit
 commands =
   py.test {posargs: {env:JUNIT:} {env:COVERAGE:} tests/}
+  black: pre-commit run black --all-files --show-diff-on-failure