diff --git a/requirements/dev.txt b/requirements/dev.txt
new file mode 100644
index 0000000..77bda22
--- /dev/null
+++ b/requirements/dev.txt
@@ -0,0 +1,3 @@
+flake8==3.9.2
+black==21.8b0
+isort==5.9.3
diff --git a/tox.ini b/tox.ini
index ba97d7c..c4ae97a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,9 +32,7 @@ deps =
 [testenv:lint]
 basepython = python3.6
 deps =
-    flake8==3.9.2
-    black==21.8b0
-    isort==5.9.3
+    -r requirements/dev.txt
 commands =
     flake8 django_migration_linter/
     black --check django_migration_linter/ tests/ manage.py setup.py