diff --git a/pyproject.toml b/pyproject.toml
index d5b34cc..d64a2f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,6 @@ enable_isort = true
 enable_mypy = false # TODO: enable mypy in the future
 mypy_preset = "strict"
 line_length = 88
-py_version = "py37"
+py_version = "py38"
 [[tool.pysen.lint.mypy_targets]]
   paths = ["."]