diff --git a/pyproject.toml b/pyproject.toml
index aca4231..99d760c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,3 +5,5 @@ target-version = ['py27']
 [tool.isort]
 profile = "black"
 multi_line_output = 3
+py_version = 27
+