diff --git a/Gemfile.lock b/Gemfile.lock
index 5afdcd5..a4c24e4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -125,11 +125,14 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
-    mustermann (1.0.2)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.3.1)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
@@ -142,8 +145,8 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.2)
-    rack (2.0.5)
-    rack-protection (2.0.2)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
@@ -199,15 +202,16 @@ GEM
       rspec-mocks (~> 3.7.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
+    ruby2_keywords (0.0.5)
     sidekiq (5.2.7)
       connection_pool (~> 2.2, >= 2.2.2)
       rack (>= 1.5.0)
       rack-protection (>= 1.5.0)
       redis (>= 3.3.5, < 5)
-    sinatra (2.0.2)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.2)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     slim (3.0.9)
       temple (>= 0.7.6, < 0.9)
@@ -226,7 +230,7 @@ GEM
     temple (0.8.0)
     thor (0.20.0)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.11)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     warden (1.2.7)