diff --git a/lib/server/config.js b/lib/server/config.js
index d2013d83..c57f45e4 100644
--- a/lib/server/config.js
+++ b/lib/server/config.js
@@ -11,12 +11,12 @@
         HOME        = (HOME_UNIX || HOME_WIN) + '/',
         
         fs          = require('fs'),
+        assert      = require('assert'),
         
         password    = require(DIR_SERVER    + 'password'),
         Util        = require(DIR_LIB       + 'util'),
         CloudFunc   = require(DIR_LIB       + 'cloudfunc'),
         
-        check       = require('checkup'),
         tryCatch    = require('try-catch'),
         pipe        = require('pipe-io'),
         ponse       = require('ponse'),
@@ -64,7 +64,7 @@
     function save(callback) {
         var data = jonny.stringify(config, 0, 4);
         
-        check(arguments, ['callback']);
+        assert('callback');
         
         if (data)
             fs.writeFile(ConfigHome, data, callback);
@@ -73,7 +73,7 @@
     }
     
     function socket(sock) {
-        check(arguments, ['socket']);
+        assert('socket');
         
         sock.of('/config')
             .on('connection', function(socket) {
diff --git a/lib/server/rest.js b/lib/server/rest.js
index 31b6786c..34fc1a2c 100644
--- a/lib/server/rest.js
+++ b/lib/server/rest.js
@@ -14,6 +14,7 @@
         DIR_JSON    = DIR_LIB + '../json/',
         
         path        = require('path'),
+        assert      = require('assert'),
         root        = require(DIR + 'root'),
         config      = require(DIR + 'config'),
         binom       = require(DIR + 'binom'),
@@ -31,12 +32,19 @@
         rendy       = require('rendy'),
         copymitter  = require('copymitter'),
         json        = require('jonny'),
-        check       = require('checkup'),
         
         Modules     = require(DIR_JSON + 'modules'),
         
         isWin32     = process.platform === 'win32';
+    
+    function check() {
+        var i,
+            n = arguments.length;
         
+        for (i = 0; i < n; i++)
+            assert(arguments[i]);
+    }
+    
     /**
      * rest interface
      *
@@ -51,7 +59,7 @@
                 response    : response
             };
         
-        check(arguments, ['request', 'response', 'next']);
+        check(request, response, next);
         
         apiURL  = CloudFunc.apiURL;
         name    = ponse.getPathName(request);
@@ -170,7 +178,7 @@
     function onPUT(name, body, callback) {
         var cmd, files, data, from, to, msg;
         
-        check(arguments, ['name', 'body', 'callback']);
+        check(name, body, callback);
         
         if (name[0] === '/')
             cmd = name.replace('/', '');
@@ -326,7 +334,7 @@
                     });
             };
         
-        check(arguments, ['files', 'processFunc', 'callback']);
+        check(files, processFunc, callback);
         
         copy();
     }
diff --git a/package.json b/package.json
index 2c808880..8e8630ea 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,6 @@
   },
   "subdomain": "cloudcmd",
   "dependencies": {
-    "checkup": "~1.0.3",
     "console-io": "~2.2.0",
     "copymitter": "~1.8.0",
     "dword": "~1.5.0",