diff --git a/app.js b/app.js
index 8013a9e320..cf7a571023 100644
--- a/app.js
+++ b/app.js
@@ -25,6 +25,7 @@
 
 	var fs = require('fs'),
 		async = require('async'),
+		semver = require('semver'),
 		winston = require('winston'),
 		pkg = require('./package.json'),
 		path = require('path'),
@@ -79,6 +80,10 @@
 			winston.info('Base Configuration OK.');
 		}
 
+		if (semver.gt(pkg.dependencies['nodebb-theme-cerulean'], require('./node_modules/nodebb-theme-cerulean/package.json').version)) {
+			winston.error('nodebb-theme-cerulean is out of date - please run npm install.')
+		}
+
 		require('./src/database').init(function(err) {
 			meta.configs.init(function () {