diff --git a/Gemfile b/Gemfile
index 459b697..7e0e035 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,4 +17,4 @@ group :development do
   gem 'directory_watcher', '1.4.1'
 end
 
-gem 'sinatra', '~> 1.4.2'
+gem 'sinatra', '~> 2.2.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index fe3f8c9..268ffd8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,26 +26,30 @@ GEM
     liquid (2.3.0)
     maruku (0.7.3)
     mathn (0.1.0)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     posix-spawn (0.3.13)
     pygments.rb (0.3.7)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rack (1.6.11)
-    rack-protection (1.5.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rake (0.9.6)
     rb-fsevent (0.10.3)
     rdiscount (2.0.7.3)
+    ruby2_keywords (0.0.5)
     rubypants (0.2.0)
     sass (3.2.19)
     sass-globbing (1.0.0)
       sass (>= 3.1)
-    sinatra (1.4.8)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     stringex (1.4.0)
-    tilt (2.0.9)
+    tilt (2.0.11)
     yajl-ruby (1.1.0)
 
 PLATFORMS
@@ -65,5 +69,5 @@ DEPENDENCIES
   rubypants (~> 0.2.0)
   sass (~> 3.2)
   sass-globbing (~> 1.0.0)
-  sinatra (~> 1.4.2)
+  sinatra (~> 2.2.3)
   stringex (~> 1.4.0)