diff --git a/pyproject.toml b/pyproject.toml
index 1657f68..76f0ac3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ build-backend = "setuptools.build_meta"
 
 [tool.black]
 line-length = 79
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py38']
 include = '\.pyi?$'
 exclude = '''
 /(