diff --git a/Gemfile.lock b/Gemfile.lock
index 840826d..af475d6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,13 +2,13 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.5.0)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     puma (5.6.4)
       nio4r (~> 2.0)
-    rack (2.2.3)
-    rack-protection (2.2.0)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -26,12 +26,12 @@ GEM
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.2.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby