diff --git a/tox.ini b/tox.ini
index 22f055d..33e8a70 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,8 +19,8 @@ deps =
 [testenv:lint]
 basepython = python3.6
 deps =
-    flake8
-    black
+    flake8==3.7.8
+    black==19.3b0
 commands =
     flake8 --max-line-length=88 django_migration_linter
     black --check django_migration_linter/ tests/ manage.py setup.py