diff --git a/debug_toolbar/panels/sql/utils.py b/debug_toolbar/panels/sql/utils.py
index efd7c1637..120674c96 100644
--- a/debug_toolbar/panels/sql/utils.py
+++ b/debug_toolbar/panels/sql/utils.py
@@ -132,7 +132,7 @@ def contrasting_color_generator():
     """
 
     def rgb_to_hex(rgb):
-        return "#%02x%02x%02x" % tuple(rgb)
+        return "#{:02x}{:02x}{:02x}".format(*tuple(rgb))
 
     triples = [
         (1, 0, 0),
diff --git a/pyproject.toml b/pyproject.toml
index e19475f46..b656d45ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,9 +55,6 @@ packages = ["debug_toolbar"]
 [tool.hatch.version]
 path = "debug_toolbar/__init__.py"
 
-[tool.ruff.isort]
-combine-as-imports = true
-
 [tool.coverage.html]
 skip_covered = true
 skip_empty = true
@@ -75,6 +72,9 @@ source = ["src", ".tox/*/site-packages"]
 fail_under = 94
 show_missing = true
 
+[tool.ruff.isort]
+combine-as-imports = true
+
 [tool.ruff]
 select = [
     # flake8/Pyflakes