diff --git a/Gemfile.lock b/Gemfile.lock
index 2a3448e..9e12307 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,20 +18,22 @@ GEM
       concurrent-ruby (~> 1.0)
     method_source (0.9.2)
     minitest (5.11.3)
-    mustermann (1.0.3)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rack (2.0.8)
-    rack-protection (2.0.5)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.5)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.10)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     zeitwerk (2.1.9)