diff --git a/pyproject.toml b/pyproject.toml
index 4ac1fd754..aa57762e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,3 +54,6 @@ template = "changelog/_template.rst"
   directory = "trivial"
   name = "Trivial/Internal Changes"
   showcontent = true
+
+[tool.black]
+target-version = ['py35']