diff --git a/Gemfile b/Gemfile
index e0d9f97..00b09b5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source :gemcutter
 
 gem 'builder', '3.0.0'
-gem 'sinatra', '1.3.2'
+gem 'sinatra', '2.2.3'
 gem 'async_sinatra', '1.0.0'
 gem 'haml', '3.1.1'
 gem 'rake', '0.9.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 79ae078..c5704f5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,19 +8,23 @@ GEM
     daemons (1.1.8)
     eventmachine (0.12.10)
     haml (3.1.1)
-    rack (1.4.1)
-    rack-protection (1.2.0)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rake (0.9.0)
-    sinatra (1.3.2)
-      rack (~> 1.3, >= 1.3.6)
-      rack-protection (~> 1.2)
-      tilt (~> 1.3, >= 1.3.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     thin (1.2.11)
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)
       rack (>= 1.0.0)
-    tilt (1.3.3)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -30,5 +34,5 @@ DEPENDENCIES
   builder (= 3.0.0)
   haml (= 3.1.1)
   rake (= 0.9.0)
-  sinatra (= 1.3.2)
+  sinatra (= 2.2.3)
   thin (= 1.2.11)