diff --git a/Gemfile.lock b/Gemfile.lock
index 713e624..07e76a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,14 +14,16 @@ GEM
     i18n (1.7.0)
       concurrent-ruby (~> 1.0)
     minitest (5.12.2)
-    mustermann (1.0.3)
-    rack (2.0.7)
-    rack-protection (2.0.7)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.3)
+    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-partial (1.0.1)
       sinatra (>= 1.4)