diff --git a/Gemfile.lock b/Gemfile.lock
index 6e121d9..59e8f18 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -44,17 +44,18 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.1.1)
-    rack (2.0.7)
+    rack (2.2.4)
     rack-flash3 (1.0.5)
       rack
-    rack-protection (2.0.5)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -82,12 +83,13 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.2)
+    ruby2_keywords (0.0.5)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     sinatra-activerecord (2.0.13)
       activerecord (>= 3.2)
@@ -98,7 +100,7 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tux (0.3.0)
       ripl (>= 0.3.5)
       ripl-multi_line (>= 0.2.4)