diff --git a/Pipfile b/Pipfile
index 2beaa4a..e231dcf 100644
--- a/Pipfile
+++ b/Pipfile
@@ -12,4 +12,4 @@ mypy = "*"
 black = "*"
 
 [requires]
-python_version = "3.10"
+python_version = "3.9"