diff --git a/web-services-smartapps/iot-sinatra-app/Gemfile.lock b/web-services-smartapps/iot-sinatra-app/Gemfile.lock
index 641faf2d..94fceb00 100644
--- a/web-services-smartapps/iot-sinatra-app/Gemfile.lock
+++ b/web-services-smartapps/iot-sinatra-app/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-protection (2.0.5)
       rack
     sinatra (2.0.5)