diff --git a/Gemfile.lock b/Gemfile.lock
index 8baf1d1..6bfa0d7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -132,7 +132,9 @@ GEM
     mime-types (3.0)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0221)
-    mimemagic (0.3.1)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.0.0)
     minitest (5.8.4)
     mocha (1.1.0)
@@ -140,6 +142,8 @@ GEM
     mono_logger (1.1.0)
     multi_json (1.12.0)
     multipart-post (2.0.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     net_dav (0.5.0)
       nokogiri (>= 1.3.0)
     nio4r (1.2.1)
@@ -153,8 +157,9 @@ GEM
       multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
     power_assert (0.3.0)
-    rack (2.0.0.rc1)
-      json
+    rack (2.2.3)
+    rack-protection (2.2.0)
+      rack
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0.rc1)
@@ -216,6 +221,7 @@ GEM
       mono_logger (~> 1.0)
       resque (>= 1.9.1)
     rinku (1.7.3)
+    ruby2_keywords (0.0.5)
     sass (3.4.22)
     sass-rails (5.0.4)
       railties (>= 4.0.0, < 5.0)
@@ -224,8 +230,11 @@ GEM
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
     semantic (1.4.1)
-    sinatra (1.0)
-      rack (>= 1.0)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     sprockets (3.6.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)