diff --git a/dummy_app/Gemfile.lock b/dummy_app/Gemfile.lock
index 4069a2f1..7c73775e 100644
--- a/dummy_app/Gemfile.lock
+++ b/dummy_app/Gemfile.lock
@@ -1,17 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.0.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     puma (3.9.1)
-    rack (2.0.3)
-    rack-protection (2.0.0)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (2.0.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    tilt (2.0.8)
+    tilt (2.0.10)
 
 PLATFORMS
   ruby