diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 065b310..dc51bbe 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,14 +18,14 @@ repos:
       - id: check-yaml
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: "v0.2.2"
+    rev: "v0.3.2"
     hooks:
       - id: ruff
         args: ["--fix", "--show-fixes"]
       - id: ruff-format
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.8.0
+    rev: v1.9.0
     hooks:
       - id: mypy
         files: src
diff --git a/src/hepunits/units/units.py b/src/hepunits/units/units.py
index a6b1b31..af27e11 100644
--- a/src/hepunits/units/units.py
+++ b/src/hepunits/units/units.py
@@ -66,7 +66,6 @@
 .. [SI] http://www.physics.nist.gov/cuu/Units/index.html.
 """
 
-
 from math import pi as _pi
 from typing import List