diff --git a/tests/ruff.toml b/tests/ruff.toml
index cc89e9e..f683c89 100644
--- a/tests/ruff.toml
+++ b/tests/ruff.toml
@@ -1,3 +1,7 @@
 line-length = 80
+[lint]
+# Ruff 0.16 enlarged its default rule set; pin the earlier defaults so the
+# checks do not depend on the installed ruff version.
+select = ["E4", "E7", "E9", "F"]
 [format]
 quote-style = 'preserve'