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diff --git a/Scripts/update-parser.sh b/Scripts/update-parser.sh
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+++ b/Scripts/update-parser.sh
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+#!/bin/sh
+#
+# update-parser.sh — Bump vendored tree-sitter-zig and rebuild the dylib.
+#
+# Purpose:
+#   Refresh the vendored snapshot under vendor/tree-sitter-zig/ to a newer
+#   upstream commit, update VENDORING.md, and rebuild the parser dylib.
+#
+# What it does:
+#   - clones tree-sitter-grammars/tree-sitter-zig into a temp dir
+#   - checks out the requested ref (default: HEAD of the default branch)
+#   - exits early if the upstream SHA matches the pinned SHA
+#   - replaces src/, queries/, grammar.js, tree-sitter.json, LICENSE
+#     with the upstream copies; leaves VENDORING.md and README.upstream.md
+#     untouched
+#   - rewrites the "Pinned commit:" line in VENDORING.md
+#   - invokes build-parser.sh to rebuild Syntaxes/libtree-sitter-zig.dylib
+#   - prints a GitHub compare link for the diff
+#
+# Usage:
+#   ./Scripts/update-parser.sh           # bump to upstream HEAD
+#   ./Scripts/update-parser.sh <ref>     # bump to a tag, branch, or SHA
+#
+# Caveats:
+#   - any local edits inside the listed paths are overwritten — review
+#     `git diff vendor/` afterwards before committing
+#   - parses VENDORING.md by an exact "Pinned commit: <sha>" line prefix;
+#     keep that line format intact
+#
+# Requirements:
+#   git, plus everything build-parser.sh needs.
+
+set -eu
+
+ROOT="$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)"
+VENDOR_DIR="$ROOT/vendor/tree-sitter-zig"
+UPSTREAM="https://github.com/tree-sitter-grammars/tree-sitter-zig.git"
+REF="${1:-HEAD}"
+
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+git clone --quiet "$UPSTREAM" "$TMP/repo"
+git -C "$TMP/repo" checkout --quiet "$REF"
+SHA="$(git -C "$TMP/repo" rev-parse HEAD)"
+
+OLD_SHA="$(awk '/^Pinned commit:/ {print $3}' "$VENDOR_DIR/VENDORING.md")"
+if [ "$SHA" = "$OLD_SHA" ]; then
+  echo "Already at $SHA — nothing to do."
+  exit 0
+fi
+
+for path in src queries grammar.js tree-sitter.json LICENSE; do
+  rm -rf "$VENDOR_DIR/$path"
+  cp -R "$TMP/repo/$path" "$VENDOR_DIR/$path"
+done
+
+sed -i.bak "s/^Pinned commit: .*/Pinned commit: $SHA/" "$VENDOR_DIR/VENDORING.md"
+rm "$VENDOR_DIR/VENDORING.md.bak"
+
+"$ROOT/Scripts/build-parser.sh"
+
+echo "Updated $OLD_SHA -> $SHA"
+echo "Compare: https://github.com/tree-sitter-grammars/tree-sitter-zig/compare/$OLD_SHA...$SHA"