diff --git a/scripts/bump.py b/scripts/bump.py
index b9d049b..a552f05 100644
--- a/scripts/bump.py
+++ b/scripts/bump.py
@@ -62,7 +62,10 @@ def main(argv: list[str] | None = None) -> int:
         print("Dry run - pyproject.toml not modified.")
         return 0
 
-    repo.PYPROJECT.write_text(set_version(repo.PYPROJECT.read_text("utf-8"), str(new_version)))
+    updated = set_version(repo.PYPROJECT.read_text("utf-8"), str(new_version))
+    # newline="" writes the string's "\n"s verbatim (LF), instead of translating to the
+    # platform default (CRLF on Windows) — keeps pyproject.toml LF, matching .gitattributes.
+    repo.PYPROJECT.write_text(updated, encoding="utf-8", newline="")
     print(f"Updated {repo.PYPROJECT.name} to version {new_version}.")
     print(
         f"Next: draft release notes (/release-notes), review CHANGELOG.md, then\n"