diff --git a/Gemfile.lock b/Gemfile.lock
index 65ff65e..1386526 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,10 +63,10 @@ GEM
       dry-logic (~> 1.0, >= 1.0.2)
     erubis (2.7.0)
     ice_nine (0.11.2)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3.1)
-    rack-protection (2.2.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rake (13.0.1)
     rspec (3.8.0)
@@ -83,12 +83,12 @@ GEM
       rspec-support (~> 3.8.0)
     rspec-support (3.8.2)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby