diff --git a/Gemfile.lock b/Gemfile.lock
index 6175b16..dde98de 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,9 @@ 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 (2.1.0)
     minitest (5.8.4)
     multi_json (1.11.2)
@@ -157,7 +159,7 @@ GEM
       pdf-core (~> 0.6.1)
       ttfunk (~> 1.4.0)
     prawn-table (0.1.2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5.1)