diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 72b7db8..5a6a197 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -28,3 +28,9 @@ repos:
       args: [ --fix ]
     # Run the formatter.
     - id: ruff-format
+- repo: https://github.com/asottile/pyupgrade
+  rev: v3.20.0
+  hooks:
+  - id: pyupgrade
+    args: [ --py39-plus ]
+    exclude: src/uwwvb.py # CircuitPython prevaling standard!