diff --git a/pyproject.toml b/pyproject.toml
index 862a52f21fad30db2296a3d0f0e9918b78de88fc..7a03edc17e8ba13aec36c8bcce5f5f1f0a5d6d18 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,6 +54,10 @@ flake8-isort = "^4.0.0"
 pytest-cov = "^2.8.1"
 pytest-sugar = "^0.9.2"
 
+[tool.black]
+line-length = 100
+exclude = "/migrations/"
+
 [build-system]
 requires = ["poetry>=1.0"]
 build-backend = "poetry.masonry.api"