diff --git a/app.js b/app.js
index 65ac505e..da8a0b41 100644
--- a/app.js
+++ b/app.js
@@ -27,7 +27,7 @@ const mongoose = require("mongoose");
 mongoose.set("strictQuery", false);
 
 const dev_db_url =
-  "mongodb+srv://cooluser:coolpassword@cluster0.lz91hw2.mongodb.net/local_library?retryWrites=true&w=majority";
+  "mongodb://localhost:27017/local_library";
 const mongoDB = process.env.MONGODB_URI || dev_db_url;
 
 main().catch((err) => console.log(err));
diff --git a/package-lock.json b/package-lock.json
index ce75aa54..b0b0fef8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "express-locallibrary-tutorial",
       "version": "0.0.1",
       "dependencies": {
+        "async": "^3.2.5",
         "compression": "^1.7.4",
         "cookie-parser": "^1.4.6",
         "debug": "~4.3.5",
@@ -155,6 +156,11 @@
       "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
       "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
     },
+    "node_modules/async": {
+      "version": "3.2.5",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.5.tgz",
+      "integrity": "sha512-baNZyqaaLhyLVKm/DlvdW051MSgO6b8eVfIezl9E5PqWxFgzLm/wQntEW4zOytVburDEr0JlALEpdOFwvErLsg=="
+    },
     "node_modules/babel-runtime": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
@@ -2233,6 +2239,11 @@
       "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
       "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
     },
+    "async": {
+      "version": "3.2.5",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.5.tgz",
+      "integrity": "sha512-baNZyqaaLhyLVKm/DlvdW051MSgO6b8eVfIezl9E5PqWxFgzLm/wQntEW4zOytVburDEr0JlALEpdOFwvErLsg=="
+    },
     "babel-runtime": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
diff --git a/package.json b/package.json
index 0ee1588a..7dece09f 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "serverstart": "DEBUG=express-locallibrary-tutorial:* npm run devstart"
   },
   "dependencies": {
+    "async": "^3.2.5",
     "compression": "^1.7.4",
     "cookie-parser": "^1.4.6",
     "debug": "~4.3.5",
diff --git a/yarn.lock b/yarn.lock
index 22c12eec..65abe265 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -100,6 +100,11 @@ asap@~2.0.3:
   resolved "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz"
   integrity sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=
 
+async@^3.2.5:
+  version "3.2.5"
+  resolved "https://registry.npmjs.org/async/-/async-3.2.5.tgz"
+  integrity sha512-baNZyqaaLhyLVKm/DlvdW051MSgO6b8eVfIezl9E5PqWxFgzLm/wQntEW4zOytVburDEr0JlALEpdOFwvErLsg==
+
 babel-runtime@^6.26.0:
   version "6.26.0"
   resolved "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz"