diff --git a/demo/Gemfile b/demo/Gemfile
index 9f5d663..ef1a70d 100644
--- a/demo/Gemfile
+++ b/demo/Gemfile
@@ -1,5 +1,5 @@
 source 'http://rubygems.org'
 
-gem 'sinatra'
+gem 'sinatra', '>= 2.2.0'
 gem 'fat_fingers'
 gem 'pony'
\ No newline at end of file
diff --git a/demo/Gemfile.lock b/demo/Gemfile.lock
index 8670547..80f3a1a 100644
--- a/demo/Gemfile.lock
+++ b/demo/Gemfile.lock
@@ -8,17 +8,21 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.21)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     polyglot (0.3.3)
     pony (1.4)
       mail (> 2.0)
-    rack (1.5.2)
-    rack-protection (1.3.2)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (1.3.5)
-      rack (~> 1.4)
-      rack-protection (~> 1.3)
-      tilt (~> 1.3, >= 1.3.3)
-    tilt (1.3.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
+    tilt (2.0.10)
     treetop (1.4.12)
       polyglot
       polyglot (>= 0.3.1)
@@ -29,4 +33,7 @@ PLATFORMS
 DEPENDENCIES
   fat_fingers
   pony
-  sinatra
+  sinatra (>= 2.2.0)
+
+BUNDLED WITH
+   2.1.4