diff --git a/config/services.yaml b/config/services.yaml
index 38d3aa23..b59e8008 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -13,6 +13,8 @@ parameters:
     cvu_brand_id: "%env(CVU_BRAND_ID)%"
     country_code: "%env(COUNTRY_CODE)%"
     api_version: "%env(API_VERSION)%"
+    android_app_version: "%env(ANDROID_APP_VERSION)%"
+    ios_app_version: "%env(IOS_APP_VERSION)%"
 
 services:
     # default configuration for services in *this* file
diff --git a/src/Controller/CustomerAppAPI/AppController.php b/src/Controller/CustomerAppAPI/AppController.php
index c78eba43..553036dd 100644
--- a/src/Controller/CustomerAppAPI/AppController.php
+++ b/src/Controller/CustomerAppAPI/AppController.php
@@ -12,6 +12,7 @@ class AppController extends ApiController
         // validate params
         $missing = $this->hasMissingParams($req, [
             'version',
+            'os',
         ]);
 
         if ($missing) {
@@ -21,21 +22,23 @@ class AppController extends ApiController
         $need_update = false;
         $msg = 'Version is up to date.';
 
-        $api_version = $this->getParameter('api_version');
-
-        $app_version = $req->query->get('version');
-        // putting this in for the future, in case we have diverging versions
         $os = $req->query->get('os');
-        $platform = $req->query->get('platform');
 
-        $api_v = explode('.', $api_version);
-        $app_v = explode('.', $app_version);
+        // putting this in for the future, in case we have diverging versions
+        //$platform = $req->query->get('platform');
 
-        if ($api_v[0] < $app_v[0]) {
+        // get only the major version numbers
+        $app_version = $req->query->get('version');
+        $app_major = substr($app_version, 0, strripos($app_version, "."));
+
+        $latest_version = $this->getParameter($os . '_app_version');
+        $latest_major = substr($latest_version, 0, strripos($latest_version, "."));
+
+        if ($latest_major < $app_major) {
             return new ApiResponse(false, 'Invalid application version: ' . $app_version);
         }
 
-        if ($api_v[0] > $app_v[0]) {
+        if ($latest_major > $app_major) {
             $need_update = true;
             $msg = 'Your version is outdated and needs an update to use the latest features RES-Q has to offer.';
         }
@@ -43,6 +46,7 @@ class AppController extends ApiController
         // response
         return new ApiResponse(true, '', [
             'need_update' => $need_update,
+            'latest_version' => $latest_version,
             'message' => $msg,
         ]);
     }