diff --git a/Gemfile.lock b/Gemfile.lock
index b5bd95a..888b8d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,10 +1,10 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    backports (3.15.0)
     ipaddr (1.2.2)
-    multi_json (1.14.1)
-    mustermann (1.0.3)
+    multi_json (1.15.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     openssl (2.1.2)
       ipaddr
@@ -13,19 +13,19 @@ GEM
     rack (2.2.3)
     rack-contrib (2.1.0)
       rack (~> 2.0)
-    rack-protection (2.0.7)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.7)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.7)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.7)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.7)
-      sinatra (= 2.0.7)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     sqlite3 (1.4.1)
     tilt (2.0.10)