diff --git a/Gemfile.lock b/Gemfile.lock
index 7741a54..52b7be8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,10 +32,11 @@ GEM
     mime-types-data (3.2018.0812)
     minitest (5.11.3)
     multi_xml (0.6.0)
-    mustermann (1.0.3)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     public_suffix (3.0.3)
-    rack (2.0.6)
-    rack-protection (2.0.5)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
     rake (10.5.0)
     request_interceptor (1.0.0)
@@ -59,15 +60,16 @@ GEM
     rspec-support (3.8.0)
     rspec_junit_formatter (0.4.1)
       rspec-core (>= 2, < 4, != 2.12.0)
+    ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
-    sinatra (2.0.5)
+    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)
     smart_properties (1.13.1)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.10)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     tzinfo-data (1.2018.5)