diff --git a/Gemfile.lock b/Gemfile.lock
index 48a974f..5022572 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,15 +1,15 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    backports (3.11.1)
     diff-lcs (1.3)
     foreman (0.84.0)
       thor (~> 0.19.1)
     kgio (2.11.2)
-    multi_json (1.13.1)
-    mustermann (1.0.2)
-    rack (2.0.4)
-    rack-protection (2.0.1)
+    multi_json (1.15.0)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     raindrops (0.19.0)
     rspec (3.7.0)
@@ -25,20 +25,20 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    sinatra (2.0.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.1)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.1)
-      backports (>= 2.0)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.1)
-      sinatra (= 2.0.1)
-      tilt (>= 1.3, < 3)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
+      tilt (~> 2.0)
     thor (0.19.4)
-    tilt (2.0.8)
+    tilt (2.0.11)
     unicorn (5.4.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)