diff --git a/pyproject.toml b/pyproject.toml
index b34501e8..8a80cdd8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ optional-dependencies.dev = [
     "pytest-beartype-tests==2026.4.26",
     "pytest-cov==7.1.0",
     "requests==2.34.2",
-    "ruff==0.15.22",
+    "ruff==0.16.0",
     # We add shellcheck-py not only for shell scripts and shell code blocks,
     # but also because having it installed means that ``actionlint-py`` will
     # use it to lint shell commands in GitHub workflow files.
@@ -123,6 +123,8 @@ lint.select = [
 lint.ignore = [
     # Ruff warns that this conflicts with the formatter.
     "COM812",
+    # Copyright headers are not required.
+    "CPY001",
     # Allow our chosen docstring line-style - pydocstringformatter handles formatting
     # but doesn't enforce D205 (blank line after summary) or D212 (summary on first line).
     "D205",