diff --git a/server/README.md b/server/README.md
index 9deaac4..b4a3622 100644
--- a/server/README.md
+++ b/server/README.md
@@ -130,6 +130,36 @@ Requires `email`, `password` and `displayname` for CLI input parameters. See bel
 
 `npm run user:create --email=randomemail@gmail.com --password=anypasasword --displayname="Game Tester" --emailverified=true`
 
+### `npm run user:update`
+
+Updates an existing Firebase Auth user.<br>
+Requires one of `email` or `uid` and 1 or more optional flags for CLI input parameter. See below for example usage.<br>
+
+#### Usage:<br>
+`npm run user:update --email=randomemail@gmail.com --password=mysecretpassword`<br>
+`npm run user:update --email=randomemail@gmail.com --displayname=Hello World --account_level=0 --disabled=false`<br>
+`npm run user:update --email=randomemail@gmail.com --emailverified=false`
+
+### Flags
+
+- `--email`
+   - Firebase Auth user email
+- `--uid`
+   - Firebase Auth user ID
+- `--password`
+   - Password
+- `--displayname`
+   - Firebase Auth user display name
+- `--disabled`
+   - Disables a Firebase Auth user account
+   - Setting to `--disabled=false` enables the accouunt
+- `--emailverified`
+   - Sets a Firebase Auth user account's `"emailVerified"` status to true
+   - Setting to `--emailverified=false` sets the account's `"emailVerified"` status to false
+- `--account_level`
+   - Sets a Firebase Auth user account's `account_level` custom claims
+
+
 ### `npm run user:delete`
 
 Deletes an existing Firebase Auth user.<br>
diff --git a/server/package.json b/server/package.json
index 9a1b556..d6e03bb 100644
--- a/server/package.json
+++ b/server/package.json
@@ -7,6 +7,7 @@
     "lint": "eslint src --ignore-path .gitignore",
     "lint:fix": "eslint --ignore-path .gitignore --fix src",
     "user:create": "node src/scripts/user/create",
+    "user:update": "node src/scripts/user/update",
     "user:delete": "node src/scripts/user/delete",
     "cards:webscrape": "node src/scripts/cards/webscraper/main"
   },
diff --git a/server/src/scripts/user/update.js b/server/src/scripts/user/update.js
new file mode 100644
index 0000000..07d636e
--- /dev/null
+++ b/server/src/scripts/user/update.js
@@ -0,0 +1,114 @@
+const { updateuser, getuser } = require('../../classes/user')
+const getargs = require('../../utils/getargs')
+
+const ARGS_FALSE_VAL = ''
+const ARGS_TRUE_VAL = 'true'
+const ACCOUNT_LEVEL_SUPERADMIN = 0
+const ACCOUNT_LEVEL_ADMIN = 1
+const ACCOUNT_LEVEL_USER = 2
+
+/**
+ * Checks if a value is valid Boolean value from the "args" data
+ * @param {String} argValue - "emailverified", "disabled" Value(s) from the "arg" data
+ * @returns {Bool}
+ */
+const isArgsBoolean = (argValue) => {
+  return [ARGS_FALSE_VAL, ARGS_TRUE_VAL].includes(argValue)
+}
+
+/**
+ * Checks if a value is valid account_level Number value from the "args" data
+ * @param {Number} argValue - "account_level" Value from the "arg" data
+ * @returns {Bool}
+ */
+const isValidAccountLevel = (argValue) => {
+  return [
+    ACCOUNT_LEVEL_SUPERADMIN.toString(),
+    ACCOUNT_LEVEL_ADMIN.toString(),
+    ACCOUNT_LEVEL_USER.toString()
+  ].includes(argValue)
+}
+
+/**
+ * Updates a Firebase Auth user data
+ */
+const updateUser = async () => {
+  try {
+    const optionalKeys = ['email', 'uid', 'password', 'emailverified', 'displayname', 'account_level', 'disabled']
+    let userData
+
+    // Get the nodejs args
+    const args = getargs({
+      params: optionalKeys,
+      optional: optionalKeys
+    })
+
+    if (args.email === undefined && args.uid === undefined) {
+      throw new Error('One of "email" or "uid" must be defined.')
+    }
+
+    // Check for 1 or more optional parameters
+    const allParams = Object.keys(args).filter(key => !['email', 'uid'].includes(key))
+
+    if (allParams.length === 0) {
+      throw new Error('Missing at least 1 optional parameter.')
+    }
+
+    // Get the user data if "args.uid" is undefined
+    if (args.uid === undefined) {
+      console.log('Fetching user data...')
+
+      userData = await getuser({
+        email: args.email
+      })
+    }
+
+    const params = {
+      uid: args?.uid ?? userData.uid
+    }
+
+    // Validate and set the optional "args" parameters
+    optionalKeys.forEach(key => {
+      if (args[key] !== undefined) {
+        switch (key) {
+          case 'account_level':
+            if (!isValidAccountLevel(args[key])) {
+              throw new Error(`Invalid Number value in the "${key}" key`)
+            }
+
+            params[key] = parseInt(args[key])
+            break
+          case 'emailverified':
+          case 'disabled':
+            if (!isArgsBoolean(args[key])) {
+              throw new Error(`Invalid Boolean value in the "${key}" key`)
+            }
+
+            params[key] = (args[key] === 'true')
+            break
+          case 'displayname':
+            if (isArgsBoolean(args[key])) {
+              throw new Error('Display name format not supported.')
+            }
+
+            params[key] = args[key]
+            break
+          default:
+            params[key] = args[key]
+            break
+        }
+      }
+    })
+
+    // At least 1 of the optional args params should be present
+    console.log(`Updating user UID ${params.uid}...`)
+    const user = await updateuser(params)
+
+    console.log('User updated!')
+    console.log(user)
+  } catch (err) {
+    console.log(`[ERROR]: ${err.message}`)
+  }
+}
+
+updateUser()