diff --git a/web-services-smartapps/iot-sinatra-app/Gemfile.lock b/web-services-smartapps/iot-sinatra-app/Gemfile.lock
index 641faf2d..94e0ce28 100644
--- a/web-services-smartapps/iot-sinatra-app/Gemfile.lock
+++ b/web-services-smartapps/iot-sinatra-app/Gemfile.lock
@@ -8,7 +8,8 @@ GEM
     multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    mustermann (1.0.3)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     oauth2 (1.4.1)
       faraday (>= 0.8, < 0.16.0)
       jwt (>= 1.0, < 3.0)
@@ -16,14 +17,15 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     rack (2.2.3)
-    rack-protection (2.0.5)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.5)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    tilt (2.0.9)
+    tilt (2.0.10)
 
 PLATFORMS
   ruby