diff --git a/Gemfile.lock b/Gemfile.lock
index 3f3e204..42a9777 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -146,7 +146,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.6.1)
     minitest (5.10.3)
     minitest-rails (3.0.0)
       minitest (~> 5.8)
@@ -159,11 +159,13 @@ GEM
     multi_json (1.13.1)
     multi_test (0.1.2)
     nio4r (2.2.0)
-    nokogiri (1.8.2)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     populator (1.0.0)
     public_suffix (3.0.1)
     puma (3.11.0)
+    racc (1.5.2)
     rack (2.0.4)
     rack-contrib (2.0.1)
       rack (~> 2.0)