diff --git a/Gemfile.lock b/Gemfile.lock
index 1c896604..8a91f56a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -97,13 +97,13 @@ GEM
     builder (3.2.3)
     byebug (10.0.2)
     cancancan (2.2.0)
-    capybara (2.6.2)
+    capybara (3.6.0)
       addressable
-      mime-types (>= 1.16)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (~> 2.0)
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      xpath (~> 3.1)
     carrierwave (0.11.0)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
@@ -272,14 +272,15 @@ GEM
     mail (2.6.6)
       mime-types (>= 1.16, < 4)
     method_source (0.8.2)
-    mime-types (3.1)
+    mime-types (3.2.2)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mime-types-data (3.2018.0812)
     mimemagic (0.3.2)
     mina (0.3.8)
       open4 (~> 1.3.4)
       rake
     mini_magick (4.8.0)
+    mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     momentjs-rails (2.8.1)
@@ -344,10 +345,9 @@ GEM
       actionpack
       activesupport
       rails (>= 3.0.0)
-    poltergeist (1.9.0)
-      capybara (~> 2.1)
+    poltergeist (1.18.1)
+      capybara (>= 2.1, < 4)
       cliver (~> 0.3.1)
-      multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
     powerpack (0.1.1)
     prawn (1.0.0)
@@ -363,7 +363,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    public_suffix (3.0.2)
+    public_suffix (3.0.3)
     puma (3.12.0)
     rack (2.0.5)
     rack-openid (1.3.1)
@@ -575,8 +575,8 @@ GEM
     whenever (0.9.2)
       activesupport (>= 2.3.4)
       chronic (>= 0.6.3)
-    xpath (2.0.0)
-      nokogiri (~> 1.3)
+    xpath (3.1.0)
+      nokogiri (~> 1.8)
     yajl-ruby (1.3.1)
 
 PLATFORMS