diff --git a/example/sinatra/Gemfile b/example/sinatra/Gemfile
index e3b4941..ce06a4d 100644
--- a/example/sinatra/Gemfile
+++ b/example/sinatra/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'sinatra', '~>1.4.7'
+gem 'sinatra', '~>3.0.4'
 gem 'thin',  '~>1.1'
 gem 'haml', '~>4.0.7'
 gem 'data_mapper', '~>1.2.0'
diff --git a/example/sinatra/Gemfile.lock b/example/sinatra/Gemfile.lock
index e6e4779..0329a31 100644
--- a/example/sinatra/Gemfile.lock
+++ b/example/sinatra/Gemfile.lock
@@ -70,20 +70,24 @@ GEM
     json-api-vanilla (1.0.1)
     json_pure (1.8.6)
     multi_json (1.13.1)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     public_suffix (3.0.2)
-    rack (1.6.10)
-    rack-protection (1.5.5)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
-    sinatra (1.4.8)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
+      tilt (~> 2.0)
     stringex (1.5.1)
     thin (1.7.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    tilt (2.0.8)
+    tilt (2.0.11)
     uuidtools (2.1.5)
 
 PLATFORMS
@@ -94,7 +98,7 @@ DEPENDENCIES
   dm-sqlite-adapter (~> 1.2.0)
   haml (~> 4.0.7)
   patreon!
-  sinatra (~> 1.4.7)
+  sinatra (~> 3.0.4)
   thin (~> 1.1)
 
 BUNDLED WITH