diff --git a/Gemfile.lock b/Gemfile.lock
index 3883dde..94f1946 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,22 +33,24 @@ GEM
     localhost (1.1.4)
     mapping (1.1.1)
     multipart-post (2.0.0)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.3.1)
     process-group (1.1.0)
-    rack (2.0.6)
-    rack-protection (2.0.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rainbow (3.0.0)
+    ruby2_keywords (0.0.5)
     samovar (1.9.2)
       mapping (~> 1.0)
       rainbow (>= 2.0, < 4.0)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    tilt (2.0.9)
+    tilt (2.0.11)
     timers (4.3.0)
 
 PLATFORMS