diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index eb4c1ac0e5..1c10090960 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,7 +12,7 @@ repos:
         exclude: test_data
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.6.9
+    rev: v0.7.0
     hooks:
       - id: ruff
         args: [--fix]
diff --git a/pyproject.toml b/pyproject.toml
index b98ec054d7..190eeff05d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,7 @@ dev = [
     "pytest-html",
     "pytest-metadata",
     "pytest-json-report",
-    "ruff==0.6.9",
+    "ruff==0.7.0",
     "sphinx",
     "sphinx-autoapi",
     "sphinx_copybutton",
diff --git a/requirements/uv/all.txt b/requirements/uv/all.txt
index 1af83d54d4..9891a496ba 100644
--- a/requirements/uv/all.txt
+++ b/requirements/uv/all.txt
@@ -472,7 +472,7 @@ rpds-py==0.20.0
     # via
     #   jsonschema
     #   referencing
-ruff==0.6.9
+ruff==0.7.0
     # via bluemira (pyproject.toml)
 scikit-learn==1.5.2
     # via bluemira (pyproject.toml)
diff --git a/requirements/uv/develop.txt b/requirements/uv/develop.txt
index 3647c10ba5..a00798b158 100644
--- a/requirements/uv/develop.txt
+++ b/requirements/uv/develop.txt
@@ -339,7 +339,7 @@ rpds-py==0.20.0
     # via
     #   jsonschema
     #   referencing
-ruff==0.6.9
+ruff==0.7.0
     # via bluemira (pyproject.toml)
 scikit-learn==1.5.2
     # via bluemira (pyproject.toml)
diff --git a/tests/utilities/test_tools.py b/tests/utilities/test_tools.py
index 2177111c50..04fe4f3801 100644
--- a/tests/utilities/test_tools.py
+++ b/tests/utilities/test_tools.py
@@ -7,6 +7,7 @@
 import copy
 import filecmp
 import json
+import string
 from pathlib import Path
 from unittest.mock import patch
 
@@ -64,7 +65,7 @@ def test_is_num():
 
 class TestAsciiStr:
     def test_asciistr(self):
-        alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        alphabet = string.ascii_letters
         for i in range(52):
             assert asciistr(i + 1) == alphabet[: i + 1]