diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index a538ca8..8251b8a 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1,22 +1,26 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.0.0)
+    json (2.6.1)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     openssl (2.0.4)
-    rack (2.0.3)
-    rack-protection (2.0.0)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    tilt (2.0.7)
+    tilt (2.0.10)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  json
   openssl
   sinatra