diff --git a/Gemfile.lock b/Gemfile.lock
index 790cc50..ad583f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,18 +5,18 @@ GEM
     httparty (0.14.0)
       multi_xml (>= 0.5.2)
     json (2.3.0)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     multi_xml (0.6.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.2)
     puma (4.3.3)
       nio4r (~> 2.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-protection (2.0.2)
       rack
     rake (13.0.1)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     sinatra (2.0.2)
       mustermann (~> 1.0)
       rack (~> 2.0)