diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a9810d..73f8afd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Changed
 
+- ruff: allow asserts and unused args in test files
 - update dependencies esp. trivy (0.73.0.1) and ruff (0.16.2)
 
 
diff --git a/src/pyproject.toml.jinja b/src/pyproject.toml.jinja
index 3b10f2e..486948d 100644
--- a/src/pyproject.toml.jinja
+++ b/src/pyproject.toml.jinja
@@ -97,7 +97,12 @@ ignore = [
     "G004",    # Logging statement uses f-string
     "ISC001",  # single-line-implicit-string-concatenation
     "PD",      # opinionated linting for pandas code
-    "S101",    # use of assert detected
     "TRY003",  # Avoid specifying long messages outside the exception class
     "CPY001",  # Missing copyright notice
 ]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**/*.py" = [
+    "S101",    # asserts allowed in tests
+    "ARG",     # unused function args (pytest fixtures)
+]
\ No newline at end of file