diff --git a/mypy.ini b/mypy.ini
index 0ddd5a5..ab879ee 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: CC0-1.0
 [mypy]
 
-python_version = 3.8
+python_version = 3.9
 
 mypy_path = src