diff --git a/pyproject.toml b/pyproject.toml
index 6c4b23b..35f68f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,5 +6,5 @@ build-backend = "setuptools.build_meta"
 write_to = "pytest_localserver/_version.py"
 
 [tool.black]
-target-version = ['py36']
+target-version = ['py37']
 line-length = 120