diff --git a/Gemfile.lock b/Gemfile.lock
index b1c670d..fba5db9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -190,7 +190,9 @@ GEM
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
     middleware (0.1.0)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.3.1)
@@ -200,7 +202,7 @@ GEM
     multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.3)
     net-scp (3.0.0)
@@ -232,8 +234,8 @@ GEM
     public_suffix (4.0.4)
     puma (4.3.3)
       nio4r (~> 2.0)
-    rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-proxy (0.6.5)
       rack
@@ -299,7 +301,7 @@ GEM
       rspec-mocks (~> 3.9)
       rspec-support (~> 3.9)
     rspec-support (3.9.2)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     ruby_dep (1.5.0)
     rubyzip (2.3.0)
     sass-rails (6.0.0)
@@ -322,10 +324,10 @@ GEM
       rack (~> 2.0)
       rack-protection (>= 1.5.0)
       redis (>= 3.3.5, < 4.2)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     slim (4.0.1)
       temple (>= 0.7.6, < 0.9)
@@ -358,7 +360,7 @@ GEM
       riddle (~> 2.3)
     thor (1.0.1)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)