diff --git a/js/web-server.js b/js/web-server.js
index 20dafb46..f1e42399 100644
--- a/js/web-server.js
+++ b/js/web-server.js
@@ -704,7 +704,9 @@ var ver = require('../js/license.js'),
     valid = require('validator'),
     agent = require('express-useragent'),
     spawn = require('child_process').spawn,
-    level = require('levelup')('./persist/', {valueEncoding:"json"}),
+    levelup = require('levelup'),
+    leveldown = require('leveldown'),
+    level = levelup(leveldown('./persist/'), {valueEncoding:"json"}),
     https = require('https'),
     uglify = require('uglify-es'),
     connect = require('connect'),
@@ -816,6 +818,15 @@ var ver = require('../js/license.js'),
     inject = {},
     injectKeys = ["kiri", "meta"];
 
+// level.createReadStream().on('data', o => {
+//     let k = o.key.toString();
+//     let v = o.value.toString();
+//     if (v.length > 80) {
+//         v = `[${v.length}] ${v.substring(0,70)}...`;
+//     }
+//     console.log(`${k} = ${v}`);
+// });
+
 /* *********************************************
  * Promises-based leveldb interface
  ********************************************* */
diff --git a/package.json b/package.json
index 8bc0a06e..fd5d7738 100644
--- a/package.json
+++ b/package.json
@@ -30,8 +30,8 @@
         "compression": "^1.7.3",
         "connect": "^3.6.6",
         "express-useragent": "^1.0.12",
-        "leveldown": "^1.9.0",
-        "levelup": "^1.3.9",
+        "levelup": "^4.0.0",
+        "leveldown": "^4.0.2",
         "moment": "^2.22.2",
         "n3d-threejs": "^72.0.0",
         "three": "^0.96.0",