diff --git a/pyproject.toml b/pyproject.toml
index 23c2f57..c70c256 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ lint.preview = true
 format.preview = true
 format.docstring-code-format = true
 format.docstring-code-line-length = 100
-[tool.ruff.per-file-ignores]
+[tool.ruff.lint.per-file-ignores]
 "tests/**/*.py" = [
   "S101",    # asserts allowed in tests
   "FBT",     # don't care about booleans as positional arguments in tests
diff --git a/src/py_discovery/_info.py b/src/py_discovery/_info.py
index 4c90a42..d80ba72 100644
--- a/src/py_discovery/_info.py
+++ b/src/py_discovery/_info.py
@@ -133,7 +133,7 @@ def abs_path(v: str | None) -> str | None:
             k: v for k, v in ([("makefile_filename", makefile())] if makefile is not None else []) if k is not None
         }
 
-        config_var_keys = set()
+        config_var_keys: set[str] = set()
         for element in self.sysconfig_paths.values():
             config_var_keys.update(k[1:-1] for k in _CONF_VAR_RE.findall(element))
         config_var_keys.add("PYTHONFRAMEWORK")
@@ -607,7 +607,9 @@ def _gen_cookie() -> str:
     return "".join(choice(f"{ascii_lowercase}{ascii_uppercase}{digits}") for _ in range(_COOKIE_LENGTH))  # noqa: S311
 
 
-def _run_subprocess(cls: type[PythonInfo], exe: str, env: MutableMapping[str, str]) -> PythonInfo | RuntimeError:
+def _run_subprocess(  # noqa: PLR0914
+    cls: type[PythonInfo], exe: str, env: MutableMapping[str, str]
+) -> PythonInfo | RuntimeError:
     py_info_script = Path(os.path.abspath(__file__)).parent / "_info.py"  # noqa: PTH100
     # Cookies allow splitting the serialized stdout output generated by the script collecting the info from the output
     # generated by something else.
@@ -665,7 +667,9 @@ def _run_subprocess(cls: type[PythonInfo], exe: str, env: MutableMapping[str, st
         result.executable = exe  # keep the original executable as this may contain initialization code
         return result
 
-    msg = f"{exe} with code {code}{f' out: {out!r}' if out else ''}{f" err: {err!r}" if err else ''}"
+    err_str = f" err: {err!r}" if err else ""
+    out_str = f" out: {out!r}" if out else ""
+    msg = f"{exe} with code {code}{out_str}{err_str}"
     return RuntimeError(f"failed to query {msg}")