diff --git a/Gemfile.lock b/Gemfile.lock
index b007578..e13c173 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,12 +100,11 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.4.0)
     minitest (4.7.5)
     multi_json (1.12.1)
-    nokogiri (1.6.8)
-      mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
+    nokogiri (1.9.1)
+      mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     owlcarousel-rails (1.1.3.3)
       jquery-rails
@@ -115,7 +114,6 @@ GEM
       cocaine (~> 0.5.3)
       mime-types
     pg (0.15.1)
-    pkg-config (1.1.7)
     polyglot (0.3.5)
     public_activity (1.4.2)
       actionpack (>= 3.0.0)