diff --git a/examples/removebot.py b/examples/removebot.py
index 1e76608..90f63c1 100644
--- a/examples/removebot.py
+++ b/examples/removebot.py
@@ -15,7 +15,7 @@ class RemoveBot(Client):
                 message_object=message_object,
                 thread_id=thread_id,
                 thread_type=thread_type,
-                **kwargs
+                **kwargs,
             )
 
 
diff --git a/pyproject.toml b/pyproject.toml
index fa008f4..f586ea2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [tool.black]
 line-length = 88
+target-version = ['py36', 'py37', 'py38']
 
 [build-system]
 requires = ["flit"]