diff --git a/server/Gemfile b/server/Gemfile
index bc5a702..966b104 100644
--- a/server/Gemfile
+++ b/server/Gemfile
@@ -2,5 +2,5 @@ source 'https://rubygems.org'
 
 gem 'activesupport'
 gem 'paint'
-gem 'sinatra', '~> 2.0.2'
+gem 'sinatra', '~> 2.2.0'
 gem 'thin'
diff --git a/server/Gemfile.lock b/server/Gemfile.lock
index c63990a..784a78b 100644
--- a/server/Gemfile.lock
+++ b/server/Gemfile.lock
@@ -12,22 +12,24 @@ GEM
     i18n (0.9.1)
       concurrent-ruby (~> 1.0)
     minitest (5.10.3)
-    mustermann (1.0.2)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     paint (2.0.0)
-    rack (2.0.8)
-    rack-protection (2.0.3)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.3)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     thin (1.7.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.10)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
 
@@ -37,7 +39,7 @@ PLATFORMS
 DEPENDENCIES
   activesupport
   paint
-  sinatra (~> 2.0.2)
+  sinatra (~> 2.2.0)
   thin
 
 BUNDLED WITH