diff --git a/.github/workflows/publish-on-main.yml b/.github/workflows/publish-on-main.yml
index eae3c92..25e3d6d 100644
--- a/.github/workflows/publish-on-main.yml
+++ b/.github/workflows/publish-on-main.yml
@@ -77,14 +77,14 @@ jobs:
             const pkg = JSON.parse(fs.readFileSync(pkgPath, "utf8"));
             // base: take only X.Y.Z part (strip any prerelease part)
             const base = String(pkg.version || "0.0.0").split("-")[0];
-            const sha = process.env.SHORT_SHA || "unknown";
+            const sha = process.env.SHORT_SHA.substring(0, 4); || "unknown";
             const newVersion = `${base}-${sha}`;
             if (!/^\d+\.\d+\.\d+(-[0-9A-Za-z-]+)?$/.test(newVersion)) {
               console.error("Computed version not semver:", newVersion);
               process.exit(1);
             }
             pkg.version = newVersion;
-            fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + "\\n");
+            fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2));
             console.log("Updated package.json version to", newVersion);
           '
         env: