diff --git a/README.md b/README.md
index 8cc0e77..5975058 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ At a minimum you need to provide the Discord bots Token, which can be found on t
 | DISCORD_BOT_TOKEN | Discord bots Token
 | NODE_ENV          | What environment the bot is running in | `production`, `development` or `test` |
 | LOG_LEVEL         | What level of logs should be displayed in console | `error`, `warn`, `info`, `verbose`, `debug` or `silly` |
+| MONGODB_URI | Full connection string for MongoDB database, include db_name if user is scoped to single database | mongodb://user:password@localhost:27017/venom_db |
+| MONGODB_DB_NAME | The name of the database to use for this project | venom_db |
 
 ### Bot commands
 
diff --git a/package.json b/package.json
index 180ed3e..e3b922b 100644
--- a/package.json
+++ b/package.json
@@ -19,11 +19,13 @@
     "discord.js": "~12.2.0",
     "dotenv": "~8.2.0",
     "inversify": "~5.0.1",
+    "mongodb": "~3.6.0",
     "reflect-metadata": "~0.1.13",
     "winston": "~3.3.3"
   },
   "devDependencies": {
     "@types/dotenv": "~8.2.0",
+    "@types/mongodb": "~3.5.25",
     "@types/node": "~14.0.27",
     "@types/winston": "~2.4.4",
     "nodemon": "~2.0.4",
@@ -35,4 +37,4 @@
     "tslint-react": "~5.0.0",
     "typescript": "~3.9.7"
   }
-}
\ No newline at end of file
+}
diff --git a/src/.env.template b/src/.env.template
index 515c07d..47195ab 100644
--- a/src/.env.template
+++ b/src/.env.template
@@ -1,4 +1,6 @@
 BOT_TRIGGER=!
 DISCORD_BOT_TOKEN=[replace with own token]
+MONGODB_URI=[mongo_connection_string]
+MONGODB_DB_NAME=[mongo_db_name]
 NODE_ENV=production
 LOG_LEVEL=error
\ No newline at end of file
diff --git a/src/app.ts b/src/app.ts
index a10959e..eaca1a1 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -5,6 +5,7 @@ import container from './inversity.config';
 
 import ConfigService from './core/services/config.service';
 import LoggerService from './core/services/logger.service';
+import MongoService from './core/services/mongo.service';
 
 import ICommand from './bot/commands/ICommand';
 import rawCommands from './bot/commands';
@@ -12,10 +13,18 @@ import rawCommands from './bot/commands';
 export default class App {
   private _configService: ConfigService = container.resolve<ConfigService>(ConfigService);
   private _loggerService: LoggerService = container.resolve<LoggerService>(LoggerService);
+  private _dbService: MongoService = container.resolve<MongoService>(MongoService);
 
   private _discordClient: Discord.Client;
 
   public async init(): Promise<void> {
+    try {
+      await this._dbService.connect();
+    } catch (err) {
+      this._loggerService.log('error', 'Cannot connect to database, exiting.');
+      exit(1);
+    }
+
     this._discordClient = new Discord.Client();
     const commandList = new Discord.Collection<string, ICommand>();
 
@@ -44,7 +53,7 @@ export default class App {
       };
 
       try {
-        await command.execute(message, args, prefix, commandList);
+        await command.execute(message, args, prefix, commandList, this._dbService);
       } catch (error) {
         this._loggerService.log('error', error.message);
         message.reply('there was an error trying to follow that command!');
@@ -57,11 +66,11 @@ export default class App {
       const greeting = greetings[Math.floor(Math.random() * greetings.length - 1)];
       // favor
       const flavors = [
-      "As PROMISED, grab a free pie! Courtesy of {random}!", 
-      "The water is pure here! You should ask {random} for their water purified water for a sip!",
-      "Home of the sane, the smart and {random}!"
+        "As PROMISED, grab a free pie! Courtesy of {random}!",
+        "The water is pure here! You should ask {random} for their water purified water for a sip!",
+        "Home of the sane, the smart and {random}!"
       ];
-      const randomMember = member.guild.members.cache.random(); 
+      const randomMember = member.guild.members.cache.random();
       const flavor = flavors[Math.floor(Math.random() * flavors.length - 1)];
       // result
       member.guild.systemChannel.send(greeting.replace('{name}', member.displayName) + " " + flavor.replace('{random}', randomMember.displayName));
@@ -73,4 +82,8 @@ export default class App {
         exit(1);
       });
   }
+
+  public exit() {
+    this._dbService.disconnect();
+  }
 }
diff --git a/src/bot/commands/ICommand.ts b/src/bot/commands/ICommand.ts
index 76ec39f..22e91ef 100644
--- a/src/bot/commands/ICommand.ts
+++ b/src/bot/commands/ICommand.ts
@@ -1,9 +1,10 @@
 import Discord, { Collection } from 'discord.js';
+import MongoService from 'src/core/services/mongo.service';
 
 export default interface ICommand {
   name: string;
   aliases?: string[];
   description: string;
   example?: string;
-  execute: (message: Discord.Message, args: string[], prefix?: string, commands?: Collection<string, ICommand>) => Promise<void>,
+  execute: (message: Discord.Message, args: string[], prefix?: string, commands?: Collection<string, ICommand>, dbService?: MongoService) => Promise<any>,
 }
\ No newline at end of file
diff --git a/src/bot/commands/addgreeting.ts b/src/bot/commands/addgreeting.ts
new file mode 100644
index 0000000..9cbb59f
--- /dev/null
+++ b/src/bot/commands/addgreeting.ts
@@ -0,0 +1,49 @@
+import Discord, { Collection } from 'discord.js';
+
+import MongoService from '../../core/services/mongo.service';
+import ConfigService from '../../core/services/config.service'
+
+import container from '../../inversity.config';
+
+import ICommand from './ICommand';
+
+const prefix = container.resolve<ConfigService>(ConfigService).get('BOT_TRIGGER');
+
+const command: ICommand = {
+  name: 'addgreeting',
+  aliases: ['ag'],
+  description: 'Adds a string to the list greetings used when new users connect to server! Include `{name}` in your message to replace with the new users name.',
+  example: `\`${prefix}addgreeting Welcome to the club {name}\``,
+  async execute(message: Discord.Message, args: string[], prefix?: string, commands?: Collection<string, ICommand>, dbService?: MongoService) {
+    // Only certain users can use this command
+    // TODO: Better handling of permissions for commands in a generic way
+    const permittedRoles = ['staff']
+    const isPermitted = message.member.roles.cache.some(r => permittedRoles.indexOf(r.name) !== -1);
+
+    if (!isPermitted) {
+      return message.author.send('Sorry but I can\'t let you add greetings!');
+    }
+
+    // Can't do much without a message
+    if (args.length === 0) {
+      return message.author.send('When adding a greeting you need to also provide a message!');
+    }
+
+    // Check for dupes
+    const greetingStr = args.join(' ');
+    const matchedMessages = await dbService.find(message.author.id, 'greetings', { message: greetingStr });
+    if (matchedMessages.length > 0) {
+      return message.author.send('That greeting has already been added!');
+    }
+
+    const result = await dbService.insert(message.author.id, 'greetings', [{ message: greetingStr }]);
+
+    if (!result) {
+      message.author.send('Uh-oh! Couldn\'t add that greeting!');
+    }
+
+    message.author.send('I\'ve added the greeting you told me about!');
+  },
+};
+
+export default command;
\ No newline at end of file
diff --git a/src/bot/commands/index.ts b/src/bot/commands/index.ts
index c96783d..8511997 100644
--- a/src/bot/commands/index.ts
+++ b/src/bot/commands/index.ts
@@ -2,10 +2,12 @@ import help from './help';
 import ping from './ping';
 import see from './see';
 import magicball from './8ball';
+import addgreeting from './addgreeting'
 
 export default [
   help,
   ping,
   see,
-  magicball
+  magicball,
+  addgreeting
 ]
\ No newline at end of file
diff --git a/src/core/services/config.service.ts b/src/core/services/config.service.ts
index 15a75f6..96fdc38 100644
--- a/src/core/services/config.service.ts
+++ b/src/core/services/config.service.ts
@@ -33,6 +33,8 @@ export default class ConfigService {
     this.config = {
       BOT_TRIGGER: process.env.BOT_TRIGGER || '!',
       DISCORD_BOT_TOKEN: process.env.DISCORD_BOT_TOKEN,
+      MONGODB_URI: process.env.MONGODB_URI || '',
+      MONGODB_DB_NAME: process.env.MONGODB_DB_NAME || '',
       ENVIRONMENT: (process.env.NODE_ENV as Environment) || 'development',
       LOG_LEVEL: (process.env.LOG_LEVEL as LogLevel) || 'info',
     };
diff --git a/src/core/services/mongo.service.ts b/src/core/services/mongo.service.ts
new file mode 100644
index 0000000..bb1efb2
--- /dev/null
+++ b/src/core/services/mongo.service.ts
@@ -0,0 +1,243 @@
+import mongodb from 'mongodb';
+import { injectable } from "inversify";
+import assert from 'assert';
+
+import container from '../../inversity.config';
+
+import ConfigService from './config.service';
+import LoggerService from './logger.service';
+
+@injectable()
+export default class MongoService {
+  private _configService: ConfigService = container.resolve<ConfigService>(ConfigService);
+  private _loggerService: LoggerService = container.resolve<LoggerService>(LoggerService);
+
+  private _mongoClient: mongodb.MongoClient;
+  public _db: mongodb.Db;
+
+  public async connect(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      this._mongoClient = new mongodb.MongoClient(this._configService.get('MONGODB_URI'), { useUnifiedTopology: true });
+
+      this._mongoClient.connect((err) => {
+        if (err) {
+          this._loggerService.log('error', 'Venom could not connect to MongoDB', err);
+          reject();
+        } else {
+          this._loggerService.log('info', 'Venom is connected to MongoDB');
+
+          this._db = this._mongoClient.db(this._configService.get('MONGODB_DB_NAME'));
+
+          resolve();
+        }
+      });
+    });
+  }
+
+  public disconnect() {
+    if (this._mongoClient && this._mongoClient.isConnected) {
+      this._loggerService.log('info', 'Closing connection to MongoDB');
+      this._mongoClient.close();
+    }
+  }
+
+  /**
+   * Fetches the first document that matches the query
+   *
+   * @param collection String identifier for collection document belongs to
+   * @param query key/value pairs of search conditions
+   *
+   * @returns Returns matched document
+   *
+   * @example findOne('123456', 'collectionName', { ident: 'generated-slug' })
+   */
+  public async findOne(userId: string, collection: string, query: any) {
+    try {
+      this.verifyConnection();
+
+      const resp = await this._db.collection(collection).findOne(query);
+
+      this._loggerService.log('verbose', 'Fetched single document from MongoDB', {
+        userId,
+        collection,
+        query,
+        resp,
+      });
+
+      return resp;
+    } catch (err) {
+      this._loggerService.log('error', 'Could not find document', {
+        userId,
+        error: err,
+        collection,
+        query,
+      });
+
+      return false;
+    }
+  }
+
+  /**
+   * Fetches all documents that match the query
+   *
+   * @param collection String identifier for collection documents belong to
+   * @param query key/value pairs of search conditions
+   *
+   * @returns Returns matched document
+   *
+   * @example find('123456', 'collectionName', { key: 'value' })
+   */
+  public async find(userId: string, collection: string, query: any) {
+    try {
+      this.verifyConnection();
+
+      const resp = await this._db.collection(collection).find(query).toArray();
+
+      this._loggerService.log('verbose', 'Fetched documents matching query from MongoDB', {
+        userId,
+        collection,
+        query,
+        resp,
+      });
+
+      return resp;
+    } catch (err) {
+      this._loggerService.log('error', 'Could not find documents', {
+        userId,
+        error: err,
+        collection,
+        query,
+      });
+
+      return [];
+    }
+  }
+
+  /**
+   * Adds one or more documents to given collection
+   *
+   * @param collection String identifier for collection document is to be stored again
+   * @param payload Array of objects containing the key/value pairs to be stored
+   *
+   * @returns Returns true for successful insert
+   *
+   * @example `insert('123456', 'collectionName', [{ body: 'This is a document!' }])`
+   */
+  public async insert(userId: string, collection: string, payload: any[]) {
+    try {
+      this.verifyConnection();
+
+      const resp = await this._db.collection(collection).insert(payload);
+
+      if (resp.result.ok !== 1 || resp.insertedCount !== payload.length) {
+        throw new Error(JSON.stringify(resp));
+      }
+
+      this._loggerService.log('verbose', `Inserted ${resp.insertedCount} documents into ${collection}`, {
+        userId,
+        collection,
+        payload,
+        resp
+      });
+
+      return true;
+    } catch (err) {
+      this._loggerService.log('error', 'Could not insert documents to database', {
+        userId,
+        error: err,
+        collection,
+        payload
+      });
+
+      return false;
+    }
+  }
+
+  /**
+   * Update single document from MongoDB
+   *
+   * @param collection String identifier for collection documents belong to
+   * @param query key/value pairs of search conditions
+   * @param payload Objects containing the key/value pairs to be stored against existing documents
+   *
+   * @returns Returns true for successful update
+   *
+   * @example `updateMany('123456', 'collectionName', { ident: 'generated-slug' }, { secondKey: 'new data'})`
+   */
+  public async updateMany(userId: string, collection: string, query: any, payload: any) {
+    try {
+      this.verifyConnection();
+
+      const resp = await this._db.collection(collection).updateMany(query, { $set: payload });
+
+      if (resp.result.ok !== 1) {
+        throw new Error(JSON.stringify(resp));
+      }
+
+      this._loggerService.log('verbose', `Updated documents into ${collection} with id ${resp.upsertedId}`, {
+        userId,
+        collection,
+        query,
+        payload,
+        resp
+      });
+
+      return true;
+    } catch (err) {
+      this._loggerService.log('error', 'Could not update documents', {
+        userId,
+        collection,
+        query,
+        payload,
+        err
+      });
+    }
+  }
+
+  /**
+   * Remove documents from MongoDB matching query
+   *
+   * @param collection String identifier for collection documents belong to
+   * @param query key/value pairs of search conditions
+   *
+   * @returns Returns true for successful delete
+   *
+   * @example `deleteMany('123456', 'collectionName', { ident: 'generated-slug' })`
+   */
+  public async deleteMany(userId: string, collection: string, query: any) {
+    try {
+      this.verifyConnection();
+
+      const resp = await this._db.collection(collection).deleteMany(query);
+
+      if (resp.result.ok !== 1) {
+        throw new Error(JSON.stringify(resp));
+      }
+
+      this._loggerService.log('verbose', `Deleted documents from ${collection}`, {
+        userId,
+        collection,
+        query,
+        resp
+      });
+
+      return true;
+    } catch (err) {
+      this._loggerService.log('error', 'Could not delete documents', {
+        userId,
+        collection,
+        query,
+        err
+      });
+
+      return false
+    }
+  }
+
+  private verifyConnection() {
+    if (!this._mongoClient.isConnected) {
+      this._loggerService.log('error', 'No database connection available');
+      throw new Error('No database connection available');
+    }
+  }
+}
diff --git a/src/core/types/Config.ts b/src/core/types/Config.ts
index 8b12d5a..d4c6bc5 100644
--- a/src/core/types/Config.ts
+++ b/src/core/types/Config.ts
@@ -4,6 +4,8 @@ import Environment from "./Environment";
 export default interface Config {
   BOT_TRIGGER: string;
   DISCORD_BOT_TOKEN: string;
+  MONGODB_URI: string;
+  MONGODB_DB_NAME: string;
   ENVIRONMENT: Environment;
   LOG_LEVEL: LogLevel;
 }
diff --git a/src/inversity.config.ts b/src/inversity.config.ts
index 385b298..ef394f4 100644
--- a/src/inversity.config.ts
+++ b/src/inversity.config.ts
@@ -2,9 +2,11 @@ import { Container } from "inversify";
 
 import ConfigService from "./core/services/config.service";
 import LoggerService from "./core/services/logger.service";
+import MongoService from "./core/services/mongo.service";
 
 const container = new Container();
 container.bind<ConfigService>(ConfigService).toSelf();
 container.bind<LoggerService>(LoggerService).toSelf();
+container.bind<MongoService>(MongoService).toSelf();
 
 export default container;
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 17235bd..242e972 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -7,6 +7,25 @@ const app = new App();
 
 try {
   app.init();
+
+  function exitHandler() {
+    // Cleans up the application
+    app.exit();
+    exit();
+  }
+
+  // do something when app is closing
+  process.on('exit', exitHandler);
+
+  //catches ctrl+c event
+  process.on('SIGINT', exitHandler);
+
+  // catches "kill pid" (for example: nodemon restart)
+  process.on('SIGUSR1', exitHandler);
+  process.on('SIGUSR2', exitHandler);
+
+  //catches uncaught exceptions
+  process.on('uncaughtException', exitHandler);
 } catch (e) {
   exit(1);
 }
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 84de0b7..0281906 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -58,6 +58,13 @@
   dependencies:
     defer-to-connect "^1.0.1"
 
+"@types/bson@*":
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/@types/bson/-/bson-4.0.2.tgz#7accb85942fc39bbdb7515d4de437c04f698115f"
+  integrity sha512-+uWmsejEHfmSjyyM/LkrP0orfE2m5Mx9Xel4tXNeqi1ldK5XMQcDsFkBmLDtuyKUbxj2jGDo0H240fbCRJZo7Q==
+  dependencies:
+    "@types/node" "*"
+
 "@types/color-name@^1.1.1":
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
@@ -75,7 +82,15 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha1-7ihweulOEdK4J7y+UnC86n8+ce4=
 
-"@types/node@~14.0.27":
+"@types/mongodb@~3.5.25":
+  version "3.5.25"
+  resolved "https://registry.yarnpkg.com/@types/mongodb/-/mongodb-3.5.25.tgz#ab187db04d79f8e3f15af236327dc9139d9d4736"
+  integrity sha512-2H/Owt+pHCl9YmBOYnXc3VdnxejJEjVdH+QCWL5ZAfPehEn3evygKBX3/vKRv7aTwfNbUd0E5vjJdQklH/9a6w==
+  dependencies:
+    "@types/bson" "*"
+    "@types/node" "*"
+
+"@types/node@*", "@types/node@~14.0.27":
   version "14.0.27"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.0.27.tgz#a151873af5a5e851b51b3b065c9e63390a9e0eb1"
   integrity sha512-kVrqXhbclHNHGu9ztnAwSncIgJv/FaxmzXJvGXNdcCpV1b8u1/Mi6z6m0vwy0LzKeXFTPLH0NzwmoJ3fNCIq0g==
@@ -171,6 +186,14 @@ binary-extensions@^2.0.0:
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-2.1.0.tgz#30fa40c9e7fe07dbc895678cd287024dea241dd9"
   integrity sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==
 
+bl@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/bl/-/bl-2.2.0.tgz#e1a574cdf528e4053019bb800b041c0ac88da493"
+  integrity sha512-wbgvOpqopSr7uq6fJrLH8EsvYMJf9gzfo2jCsL2eTy75qXPukA4pCgHamOQkZtY5vmfVtjB+P3LNlMHW5CEZXA==
+  dependencies:
+    readable-stream "^2.3.5"
+    safe-buffer "^5.1.1"
+
 boxen@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/boxen/-/boxen-4.2.0.tgz#e411b62357d6d6d36587c8ac3d5d974daa070e64"
@@ -200,6 +223,11 @@ braces@~3.0.2:
   dependencies:
     fill-range "^7.0.1"
 
+bson@^1.1.4:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/bson/-/bson-1.1.5.tgz#2aaae98fcdf6750c0848b0cba1ddec3c73060a34"
+  integrity sha512-kDuEzldR21lHciPQAIulLs1LZlCXdLziXI6Mb/TDkwXhb//UORJNPXgcRs2CuO4H0DcMkpfT3/ySsP3unoZjBg==
+
 buffer-from@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
@@ -405,6 +433,11 @@ delayed-stream@~1.0.0:
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
   integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
 
+denque@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/denque/-/denque-1.4.1.tgz#6744ff7641c148c3f8a69c307e51235c1f4a37cf"
+  integrity sha512-OfzPuSZKGcgr96rf1oODnfjqBFmr1DVoc/TrItj3Ohe0Ah1C5WX5Baquw/9U9KovnQ88EqmJbD66rKYUQYN1tQ==
+
 diff@^4.0.1:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.2.tgz#60f3aecb89d5fae520c11aa19efc2bb982aade7d"
@@ -801,6 +834,11 @@ make-error@^1.1.1:
   resolved "https://registry.yarnpkg.com/make-error/-/make-error-1.3.6.tgz#2eb2e37ea9b67c4891f684a1394799af484cf7a2"
   integrity sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==
 
+memory-pager@^1.0.2:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/memory-pager/-/memory-pager-1.5.0.tgz#d8751655d22d384682741c972f2c3d6dfa3e66b5"
+  integrity sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==
+
 mime-db@1.44.0:
   version "1.44.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.44.0.tgz#fa11c5eb0aca1334b4233cb4d52f10c5a6272f92"
@@ -837,6 +875,19 @@ mkdirp@^0.5.3:
   dependencies:
     minimist "^1.2.5"
 
+mongodb@~3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/mongodb/-/mongodb-3.6.0.tgz#babd7172ec717e2ed3f85e079b3f1aa29dce4724"
+  integrity sha512-/XWWub1mHZVoqEsUppE0GV7u9kanLvHxho6EvBxQbShXTKYF9trhZC2NzbulRGeG7xMJHD8IOWRcdKx5LPjAjQ==
+  dependencies:
+    bl "^2.2.0"
+    bson "^1.1.4"
+    denque "^1.4.1"
+    require_optional "^1.0.1"
+    safe-buffer "^5.1.2"
+  optionalDependencies:
+    saslprep "^1.0.0"
+
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
@@ -979,7 +1030,7 @@ rc@^1.2.8:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-readable-stream@^2.3.7:
+readable-stream@^2.3.5, readable-stream@^2.3.7:
   version "2.3.7"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.7.tgz#1eca1cf711aef814c04f62252a36a62f6cb23b57"
   integrity sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==
@@ -1027,6 +1078,19 @@ registry-url@^5.0.0:
   dependencies:
     rc "^1.2.8"
 
+require_optional@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/require_optional/-/require_optional-1.0.1.tgz#4cf35a4247f64ca3df8c2ef208cc494b1ca8fc2e"
+  integrity sha512-qhM/y57enGWHAe3v/NcwML6a3/vfESLe/sGM2dII+gEO0BpKRUkWZow/tyloNqJyN6kXSl3RyyM8Ll5D/sJP8g==
+  dependencies:
+    resolve-from "^2.0.0"
+    semver "^5.1.0"
+
+resolve-from@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-2.0.0.tgz#9480ab20e94ffa1d9e80a804c7ea147611966b57"
+  integrity sha1-lICrIOlP+h2egKgEx+oUdhGWa1c=
+
 resolve@^1.3.2:
   version "1.17.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.17.0.tgz#b25941b54968231cc2d1bb76a79cb7f2c0bf8444"
@@ -1041,15 +1105,22 @@ responselike@^1.0.2:
   dependencies:
     lowercase-keys "^1.0.0"
 
+safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.2.0:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
+
 safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
   integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
 
-safe-buffer@~5.2.0:
-  version "5.2.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
-  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
+saslprep@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/saslprep/-/saslprep-1.0.3.tgz#4c02f946b56cf54297e347ba1093e7acac4cf226"
+  integrity sha512-/MY/PEMbk2SuY5sScONwhUDsV2p77Znkb/q3nSVstq/yQzYJOH/Azh29p9oJLsl3LnQwSvZDKagDGBsBwSooag==
+  dependencies:
+    sparse-bitfield "^3.0.3"
 
 semver-diff@^3.1.1:
   version "3.1.1"
@@ -1058,7 +1129,7 @@ semver-diff@^3.1.1:
   dependencies:
     semver "^6.3.0"
 
-semver@^5.3.0, semver@^5.7.1:
+semver@^5.1.0, semver@^5.3.0, semver@^5.7.1:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
   integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
@@ -1098,6 +1169,13 @@ source-map@^0.6.0:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
+sparse-bitfield@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz#ff4ae6e68656056ba4b3e792ab3334d38273ca11"
+  integrity sha1-/0rm5oZWBWuks+eSqzM004JzyhE=
+  dependencies:
+    memory-pager "^1.0.2"
+
 sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"