diff --git a/api/api.js b/api/api.js
index 331469a9..7b2931c7 100644
--- a/api/api.js
+++ b/api/api.js
@@ -18,13 +18,21 @@ var mailTransport = nodemailer.createTransport({
 // Replace by user's info during configuration
 var db = "mongodb://sensordx:helloworld@ds161049.mlab.com:61049/issue_tracker";
 
-mongoose.connect(db, function(err, response) {
- if (err)
+// mongoose.connect(db, function(err, response) {
+//  if (err)
+//   console.log('Fail to connect to '+ db);
+//  else
+//   console.log('Successfully connected to '+ db);
+// });
+
+mongoose.connect(db, {
+  useUnifiedTopology: true,
+  useNewUrlParser: true,
+})
+.then(() => console.log('==Successfully connected to '+ db))
+.catch(err => {
   console.log('Fail to connect to '+ db);
- else
-  console.log('Successfully connected to '+ db);
 });
-
 /**
  * Initiate Models
  */
diff --git a/package-lock.json b/package-lock.json
index ff081097..d77b5529 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -153,9 +153,9 @@
       }
     },
     "bluebird": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.0.tgz",
-      "integrity": "sha1-eRQg1/VR7qKJdFOop3ZT+WYG1nw="
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.1.tgz",
+      "integrity": "sha512-MKiLiV+I1AA596t9w1sQJ8jkiSr5+ZKi0WKrYGUn6d1Fx+Ij4tIj+m2WMQSGczs5jZVxV339chE8iwk6F64wjA=="
     },
     "body-parser": {
       "version": "1.18.2",
@@ -203,14 +203,15 @@
       }
     },
     "bson": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/bson/-/bson-1.0.6.tgz",
-      "integrity": "sha512-D8zmlb46xfuK2gGvKmUjIklQEouN2nQ0LEHHeZ/NoHM2LDiMk2EYzZ5Ntw/Urk+bgMDosOZxaRzXxvhI5TcAVQ=="
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.1.tgz",
+      "integrity": "sha512-jCGVYLoYMHDkOsbwJZBCqwMHyH4c+wzgI9hG7Z6SZJRXWr+x58pdIbm2i9a/jFGCkRJqRUr8eoI7lDWa0hTkxg=="
     },
     "buffer-shims": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
-      "integrity": "sha1-mXjOMXOIxkmth5MCjDR37wRKi1E="
+      "integrity": "sha1-mXjOMXOIxkmth5MCjDR37wRKi1E=",
+      "dev": true
     },
     "builtin-modules": {
       "version": "1.1.1",
@@ -348,7 +349,8 @@
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+      "dev": true
     },
     "cryptiles": {
       "version": "2.0.5",
@@ -475,11 +477,6 @@
         "is-arrayish": "0.2.1"
       }
     },
-    "es6-promise": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-3.2.1.tgz",
-      "integrity": "sha1-7FYjOGgDKQkgcXDDlEjiREndH8Q="
-    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -1074,11 +1071,6 @@
       "integrity": "sha1-uDT3I8xKJCqmWWNFnfbZhMXT2Vk=",
       "dev": true
     },
-    "hooks-fixed": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/hooks-fixed/-/hooks-fixed-2.0.2.tgz",
-      "integrity": "sha512-YurCM4gQSetcrhwEtpQHhQ4M7Zo7poNGqY4kQGeBS6eZtOcT3tnNs01ThFa0jYBByAiYt1MjMjP/YApG0EnAvQ=="
-    },
     "hosted-git-info": {
       "version": "2.6.0",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.6.0.tgz",
@@ -1230,7 +1222,8 @@
     "isarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
-      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
+      "dev": true
     },
     "isexe": {
       "version": "2.0.0",
@@ -1316,9 +1309,9 @@
       }
     },
     "kareem": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/kareem/-/kareem-1.5.0.tgz",
-      "integrity": "sha1-4+QQHZ3P3imXadr0tNtk2JXRdEg="
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/kareem/-/kareem-2.3.1.tgz",
+      "integrity": "sha512-l3hLhffs9zqoDe8zjmb/mAN4B8VT3L56EUvKNqLFVs9YlFA+zx7ke1DO8STAdDyYNkeSo1nKmjuvQeI12So8Xw=="
     },
     "kind-of": {
       "version": "3.2.2",
@@ -1373,7 +1366,8 @@
     "lodash": {
       "version": "4.17.5",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.5.tgz",
-      "integrity": "sha512-svL3uiZf1RwhH+cWrfZn3A4+U58wbP0tGVTLQPbjplZxZ8ROD9VLuNgsRniTlLe7OlSqR79RUehXgpBW/s0IQw=="
+      "integrity": "sha512-svL3uiZf1RwhH+cWrfZn3A4+U58wbP0tGVTLQPbjplZxZ8ROD9VLuNgsRniTlLe7OlSqR79RUehXgpBW/s0IQw==",
+      "dev": true
     },
     "lodash.clonedeep": {
       "version": "4.5.0",
@@ -1381,11 +1375,6 @@
       "integrity": "sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=",
       "dev": true
     },
-    "lodash.get": {
-      "version": "4.4.2",
-      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
-      "integrity": "sha1-LRd/ZS+jHpObRDjVNBSZ36OCXpk="
-    },
     "longest": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
@@ -1506,54 +1495,57 @@
       }
     },
     "mongodb": {
-      "version": "2.2.34",
-      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-2.2.34.tgz",
-      "integrity": "sha1-o09Zu+thdUrsQy3nLD/iFSakTBo=",
-      "requires": {
-        "es6-promise": "3.2.1",
-        "mongodb-core": "2.1.18",
-        "readable-stream": "2.2.7"
-      }
-    },
-    "mongodb-core": {
-      "version": "2.1.18",
-      "resolved": "https://registry.npmjs.org/mongodb-core/-/mongodb-core-2.1.18.tgz",
-      "integrity": "sha1-TEYTm986HwMt7ZHbSfOO7AFlkFA=",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-3.3.2.tgz",
+      "integrity": "sha512-fqJt3iywelk4yKu/lfwQg163Bjpo5zDKhXiohycvon4iQHbrfflSAz9AIlRE6496Pm/dQKQK5bMigdVo2s6gBg==",
       "requires": {
-        "bson": "1.0.6",
-        "require_optional": "1.0.1"
+        "bson": "1.1.1",
+        "require_optional": "1.0.1",
+        "safe-buffer": "5.2.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+        }
       }
     },
     "mongoose": {
-      "version": "4.13.12",
-      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-4.13.12.tgz",
-      "integrity": "sha512-pH8NK5AYGbnPeEFFGs5ACk18vzzcy4DFT48U9kKvkfg6SI3nJZkzGfN7o1NDWjy+kP26hWyU/AMhYTfe5hSVnA==",
-      "requires": {
-        "async": "2.1.4",
-        "bson": "1.0.6",
-        "hooks-fixed": "2.0.2",
-        "kareem": "1.5.0",
-        "lodash.get": "4.4.2",
-        "mongodb": "2.2.34",
-        "mpath": "0.3.0",
-        "mpromise": "0.5.5",
-        "mquery": "2.3.3",
-        "ms": "2.0.0",
-        "muri": "1.3.0",
-        "regexp-clone": "0.0.1",
+      "version": "5.7.5",
+      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-5.7.5.tgz",
+      "integrity": "sha512-BZ4FxtnbTurc/wcm/hLltLdI4IDxo4nsE0D9q58YymTdZwreNzwO62CcjVtaHhmr8HmJtOInp2W/T12FZaMf8g==",
+      "requires": {
+        "bson": "1.1.1",
+        "kareem": "2.3.1",
+        "mongodb": "3.3.2",
+        "mongoose-legacy-pluralize": "1.0.2",
+        "mpath": "0.6.0",
+        "mquery": "3.2.2",
+        "ms": "2.1.2",
+        "regexp-clone": "1.0.0",
+        "safe-buffer": "5.1.2",
+        "sift": "7.0.1",
         "sliced": "1.0.1"
       },
       "dependencies": {
-        "async": {
-          "version": "2.1.4",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.1.4.tgz",
-          "integrity": "sha1-LSFgx3iAMuTdbL4lAvH5osj2zeQ=",
-          "requires": {
-            "lodash": "4.17.5"
-          }
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
         }
       }
     },
+    "mongoose-legacy-pluralize": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/mongoose-legacy-pluralize/-/mongoose-legacy-pluralize-1.0.2.tgz",
+      "integrity": "sha512-Yo/7qQU4/EyIS8YDFSeenIvXxZN+ld7YdV9LqFVQJzTLye8unujAWPZ4NWKfFA+RNjh+wvTWKY9Z3E5XM6ZZiQ=="
+    },
     "morgan": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/morgan/-/morgan-1.9.0.tgz",
@@ -1567,30 +1559,34 @@
       }
     },
     "mpath": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/mpath/-/mpath-0.3.0.tgz",
-      "integrity": "sha1-elj3iem1/TyUUgY0FXlg8mvV70Q="
-    },
-    "mpromise": {
-      "version": "0.5.5",
-      "resolved": "https://registry.npmjs.org/mpromise/-/mpromise-0.5.5.tgz",
-      "integrity": "sha1-9bJCWddjrMIlewoMjG2Gb9UXMuY="
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/mpath/-/mpath-0.6.0.tgz",
+      "integrity": "sha512-i75qh79MJ5Xo/sbhxrDrPSEG0H/mr1kcZXJ8dH6URU5jD/knFxCVqVC/gVSW7GIXL/9hHWlT9haLbCXWOll3qw=="
     },
     "mquery": {
-      "version": "2.3.3",
-      "resolved": "https://registry.npmjs.org/mquery/-/mquery-2.3.3.tgz",
-      "integrity": "sha512-NC8L14kn+qxJbbJ1gbcEMDxF0sC3sv+1cbRReXXwVvowcwY1y9KoVZFq0ebwARibsadu8lx8nWGvm3V0Pf0ZWQ==",
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/mquery/-/mquery-3.2.2.tgz",
+      "integrity": "sha512-XB52992COp0KP230I3qloVUbkLUxJIu328HBP2t2EsxSFtf4W1HPSOBWOXf1bqxK4Xbb66lfMJ+Bpfd9/yZE1Q==",
       "requires": {
-        "bluebird": "3.5.0",
-        "debug": "2.6.9",
-        "regexp-clone": "0.0.1",
-        "sliced": "0.0.5"
+        "bluebird": "3.5.1",
+        "debug": "3.1.0",
+        "regexp-clone": "1.0.0",
+        "safe-buffer": "5.1.2",
+        "sliced": "1.0.1"
       },
       "dependencies": {
-        "sliced": {
-          "version": "0.0.5",
-          "resolved": "https://registry.npmjs.org/sliced/-/sliced-0.0.5.tgz",
-          "integrity": "sha1-XtwETKTrb3gW1Qui/GPiXY/kcH8="
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
         }
       }
     },
@@ -1599,11 +1595,6 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
     },
-    "muri": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/muri/-/muri-1.3.0.tgz",
-      "integrity": "sha512-FiaFwKl864onHFFUV/a2szAl7X0fxVlSKNdhTf+BM8i8goEgYut8u5P9MqQqIYwvaMxjzVESsoEm/2kfkFH1rg=="
-    },
     "nan": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/nan/-/nan-2.7.0.tgz",
@@ -1782,7 +1773,8 @@
     "process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
-      "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M="
+      "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=",
+      "dev": true
     },
     "promise": {
       "version": "7.3.1",
@@ -1863,6 +1855,7 @@
       "version": "2.2.7",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.7.tgz",
       "integrity": "sha1-BwV6y+JGeyIELTb5jFrVBwVOlbE=",
+      "dev": true,
       "requires": {
         "buffer-shims": "1.0.0",
         "core-util-is": "1.0.2",
@@ -1884,9 +1877,9 @@
       }
     },
     "regexp-clone": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/regexp-clone/-/regexp-clone-0.0.1.tgz",
-      "integrity": "sha1-p8LgmJH9vzj7sQ03b7cwA+aKxYk="
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/regexp-clone/-/regexp-clone-1.0.0.tgz",
+      "integrity": "sha512-TuAasHQNamyyJ2hb97IuBEif4qBHGjPHBS64sZwytpLEqtBQ1gPJTnOaQ6qmpET16cK14kkjbazl6+p0RRv0yw=="
     },
     "repeat-string": {
       "version": "1.6.1",
@@ -2024,6 +2017,11 @@
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.0.3.tgz",
       "integrity": "sha1-ZlZ+NwQ+608E2RvWWMDL77VbjgQ="
     },
+    "sift": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/sift/-/sift-7.0.1.tgz",
+      "integrity": "sha512-oqD7PMJ+uO6jV9EQCl0LrRw1OwsiPsiFQR5AR30heR+4Dl7jBBbDLnNvWiak20tzZlSE1H7RB30SX/1j/YYT7g=="
+    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -2836,6 +2834,7 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
       "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "dev": true,
       "requires": {
         "safe-buffer": "5.1.1"
       }
@@ -3082,7 +3081,8 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
     },
     "utils-merge": {
       "version": "1.0.1",
diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 320d9576..22ce824c
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "body-parser": "^1.15.2",
     "express": "^4.14.0",
     "fs-path": "0.0.23",
-    "mongoose": "^4.7.6",
+    "mongoose": "^5.7.5",
     "morgan": "^1.7.0",
     "node-fetch": "^1.7.2",
     "nodemailer": "^4.0.1",