diff --git a/Gemfile b/Gemfile
index aa165ee..54fc4ab 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
 source 'http://rubygems.org'
 
-gem 'sinatra', '1.0'
+gem 'sinatra', '2.2.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index aa33ae7..6ad3bc0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,12 +1,21 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    rack (1.2.1)
-    sinatra (1.0)
-      rack (>= 1.0)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
+      rack
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (= 1.0)
+  sinatra (= 2.2.3)