diff --git a/Gemfile b/Gemfile
index 7bd29d5..0496f20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'thin'
 gem 'rack-ssl', '~> 1.4'
-gem 'sinatra', '~> 2.0', '>= 2.0.4'
+gem 'sinatra', '~> 2.2'
 gem 'json'
 gem 'mongo'
 gem 'rack', '~> 2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 870351e..ada586f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,24 +7,24 @@ GEM
     json (2.5.1)
     mongo (2.14.0)
       bson (>= 4.8.2, < 5.0.0)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     rack (2.2.3)
-    rack-protection (2.1.0)
+    rack-protection (2.2.3)
       rack
     rack-ssl (1.4.1)
       rack
-    ruby2_keywords (0.0.4)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.1.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     thin (1.8.1)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -34,7 +34,7 @@ DEPENDENCIES
   mongo
   rack (~> 2.1)
   rack-ssl (~> 1.4)
-  sinatra (~> 2.0, >= 2.0.4)
+  sinatra (~> 2.2)
   thin
 
 BUNDLED WITH