diff --git a/sample_app/Gemfile.lock b/sample_app/Gemfile.lock
index 46ddf0c..4639e89 100644
--- a/sample_app/Gemfile.lock
+++ b/sample_app/Gemfile.lock
@@ -14,16 +14,20 @@ GEM
     i18n (0.6.5)
     minitest (4.7.5)
     multi_json (1.8.2)
-    rack (1.6.0)
-    rack-protection (1.5.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    sinatra (1.4.5)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (~> 1.3, >= 1.3.4)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     thread_safe (0.1.3)
       atomic
-    tilt (1.4.1)
+    tilt (2.0.11)
     tzinfo (0.3.38)
 
 PLATFORMS