diff --git a/scripts/release.sh b/scripts/release.sh
index a71d49218..871496f21 100755
--- a/scripts/release.sh
+++ b/scripts/release.sh
@@ -140,6 +140,29 @@ update_readme_version_row() {
   ' "$file" "$VERSION" "$label" "$first_col" "$second_col" "$third_col"
 }
 
+update_marketplace_plugin_version() {
+  local file="$1"
+  # Was `sed "0,/re/s|..."`, which is a GNU extension. BSD sed on macOS ignores
+  # it and still exits 0, so the bump silently no-opped here and only surfaced
+  # later as a plugin-manifest test failure. Node replaces the first match on
+  # every platform and fails loudly.
+  node -e '
+    const fs = require("fs");
+    const file = process.argv[1];
+    const version = process.argv[2];
+    const current = fs.readFileSync(file, "utf8");
+    const updated = current.replace(
+      /"version": *"[0-9]+\.[0-9]+\.[0-9]+(?:-[0-9A-Za-z.-]+)?"/,
+      `"version": "${version}"`
+    );
+    if (updated === current) {
+      console.error(`Error: could not update plugin version in ${file}`);
+      process.exit(1);
+    }
+    fs.writeFileSync(file, updated);
+  ' "$file" "$VERSION"
+}
+
 update_latest_release_heading() {
   local file="$1"
   node -e '
@@ -268,7 +291,7 @@ update_agents_version "$ZH_CN_AGENTS_MD" "版本"
 update_agent_yaml_version
 update_version_file
 update_version "$PLUGIN_JSON" "s|\"version\": *\"[^\"]*\"|\"version\": \"$VERSION\"|"
-update_version "$MARKETPLACE_JSON" "0,/\"version\": *\"[^\"]*\"/s|\"version\": *\"[^\"]*\"|\"version\": \"$VERSION\"|"
+update_marketplace_plugin_version "$MARKETPLACE_JSON"
 update_codex_marketplace_version
 update_version "$CODEX_PLUGIN_JSON" "s|\"version\": *\"[^\"]*\"|\"version\": \"$VERSION\"|"
 update_version "$CODEX_MARKETPLACE_PLUGIN_JSON" "s|\"version\": *\"[^\"]*\"|\"version\": \"$VERSION\"|"
@@ -281,6 +304,9 @@ update_latest_release_heading "$README_FILE"
 update_latest_release_heading "$ROOT_ZH_CN_README_FILE"
 update_latest_release_heading "$TR_README_FILE"
 update_latest_release_heading "$PT_BR_README_FILE"
+# docs/zh-CN/README.md got its version row bumped but never its release
+# heading, so plugin-manifest.test.js failed on it every time.
+update_latest_release_heading "$ZH_CN_README_FILE"
 update_selective_install_repo_version "$SELECTIVE_INSTALL_ARCHITECTURE_DOC"
 
 # Verify the bumped release surface is still internally consistent before