diff --git a/pyproject.toml b/pyproject.toml
index 5b6351cee76af4b5f20b7ae80f702aa1a6b99707..af62b7a7957e68155b305db7f8b14239cae0acd2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,4 @@
 [tool.black]
 line-length=79
 target-version=['py36']
-experimental_string_processing=true
+preview=true