diff --git a/requirements-dev.txt b/requirements-dev.txt
index f8b9f06..eb36758 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,4 +2,7 @@ coverage
 pycodestyle
 pytest>=2.8
 pytest-cov
-pytest-sugar
\ No newline at end of file
+pytest-sugar
+black
+flake8
+isort
\ No newline at end of file