diff --git a/background/update.js b/background/update.js
index cd9b77bb..07e6a6a5 100644
--- a/background/update.js
+++ b/background/update.js
@@ -119,7 +119,8 @@ global API_METHODS
         if (md5 === style.originalMd5 && style.originalDigest && !ignoreDigest) {
           return Promise.reject(STATES.SAME_MD5);
         }
-        return download(style.updateUrl)
+        // USO can't handle POST requests for style json
+        return download(style.updateUrl, {body: null})
           .then(text => tryJSONparse(text));
       });
     }
diff --git a/manifest.json b/manifest.json
index fe558a45..6d56dd57 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
   "name": "Stylus",
-  "version": "1.3.7",
+  "version": "1.3.8",
   "minimum_chrome_version": "49",
   "description": "__MSG_description__",
   "homepage_url": "https://add0n.com/stylus.html",