diff --git a/pytest_examples/config.py b/pytest_examples/config.py
index ced2099..ee7f75b 100644
--- a/pytest_examples/config.py
+++ b/pytest_examples/config.py
@@ -44,7 +44,10 @@ def hash(self) -> str:
 
     def ruff_config(self) -> tuple[str, ...]:
         config_lines: list[str] = []
-        select: list[str] = []
+        # Pin ruff's classic default rule set as our base rather than inheriting ruff's evolving defaults:
+        # ruff 0.16 added `I` (isort) and `FA` (future-annotations) to the defaults, which would silently
+        # start flagging examples that pytest-examples never opted into. Opt-in flags extend this base.
+        select: list[str] = ['E4', 'E7', 'E9', 'F']
         ignore: list[str] = []
         args: list[str] = []
 
@@ -76,8 +79,7 @@ def ruff_config(self) -> tuple[str, ...]:
             ignore.extend(self.ruff_ignore)
 
         if select:
-            # use extend to not disable default select
-            args.append(f'--extend-select={",".join(select)}')
+            args.append(f'--select={",".join(select)}')
         if ignore:
             args.append(f'--ignore={",".join(ignore)}')
 
diff --git a/pytest_examples/lint.py b/pytest_examples/lint.py
index 07d22b0..8230b76 100644
--- a/pytest_examples/lint.py
+++ b/pytest_examples/lint.py
@@ -49,7 +49,9 @@ def ruff_check(
     extra_ruff_args: tuple[str, ...] = (),
 ) -> str:
     ruff = find_ruff_bin()
-    args = ruff, 'check', '-', *config.ruff_config(), *extra_ruff_args
+    # Pin the concise output format: ruff 0.16 made the grouped `full` format the default, which breaks the
+    # `^-:(\d+)` offset rewriting below and the readable one-line-per-error output.
+    args = ruff, 'check', '-', '--output-format=concise', *config.ruff_config(), *extra_ruff_args
 
     p = Popen(args, stdin=PIPE, stdout=PIPE, stderr=PIPE, encoding='utf-8')
     stdout, stderr = p.communicate(example.source, timeout=10)