diff --git a/Gemfile.lock b/Gemfile.lock
index 43213e73085..99ed6d189c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,39 +1,39 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (5.1.6)
-      actionpack (= 5.1.6)
-      actionview (= 5.1.6)
-      activejob (= 5.1.6)
+    actionmailer (5.1.4)
+      actionpack (= 5.1.4)
+      actionview (= 5.1.4)
+      activejob (= 5.1.4)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.6)
-      actionview (= 5.1.6)
-      activesupport (= 5.1.6)
+    actionpack (5.1.4)
+      actionview (= 5.1.4)
+      activesupport (= 5.1.4)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.6)
-      activesupport (= 5.1.6)
+    actionview (5.1.4)
+      activesupport (= 5.1.4)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
     active_model_serializers (0.8.3)
       activemodel (>= 3.0)
-    activejob (5.1.6)
-      activesupport (= 5.1.6)
+    activejob (5.1.4)
+      activesupport (= 5.1.4)
       globalid (>= 0.3.6)
-    activemodel (5.1.6)
-      activesupport (= 5.1.6)
-    activerecord (5.1.6)
-      activemodel (= 5.1.6)
-      activesupport (= 5.1.6)
+    activemodel (5.1.4)
+      activesupport (= 5.1.4)
+    activerecord (5.1.4)
+      activemodel (= 5.1.4)
+      activesupport (= 5.1.4)
       arel (~> 8.0)
-    activesupport (5.1.6)
+    activesupport (5.1.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
+      i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.5.1)
@@ -80,7 +80,7 @@ GEM
     cppjieba_rb (0.3.0)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
-    crass (1.0.4)
+    crass (1.0.3)
     debug_inspector (0.0.3)
     diff-lcs (1.3)
     discourse_image_optim (0.24.5)
@@ -103,7 +103,7 @@ GEM
       jquery-rails (>= 1.0.17)
       railties (>= 3.1)
     ember-source (2.13.3)
-    erubi (1.7.1)
+    erubi (1.6.1)
     erubis (2.7.0)
     excon (0.56.0)
     execjs (2.7.0)
@@ -124,7 +124,7 @@ GEM
       thor (~> 0.19.1)
     fspath (3.1.0)
     gc_tracer (1.5.1)
-    globalid (0.4.1)
+    globalid (0.4.0)
       activesupport (>= 4.2.0)
     guess_html_encoding (0.0.11)
     hashdiff (0.3.4)
@@ -134,8 +134,7 @@ GEM
     hkdf (0.3.0)
     htmlentities (4.3.4)
     http_accept_language (2.0.5)
-    i18n (1.0.1)
-      concurrent-ruby (~> 1.0)
+    i18n (0.8.6)
     image_size (1.5.0)
     in_threads (1.4.0)
     jmespath (1.3.1)
@@ -176,7 +175,7 @@ GEM
       libv8 (~> 6.3)
     mini_suffix (0.3.0)
       ffi (~> 1.9)
-    minitest (5.11.3)
+    minitest (5.10.3)
     mocha (1.2.1)
       metaclass (~> 0.0.1)
     mock_redis (0.17.3)
@@ -261,7 +260,7 @@ GEM
       ruby-openid (>= 2.1.8)
     rack-protection (2.0.1)
       rack
-    rack-test (1.0.0)
+    rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
@@ -271,15 +270,15 @@ GEM
     rails_multisite (2.0.4)
       activerecord (> 4.2, < 6)
       railties (> 4.2, < 6)
-    railties (5.1.6)
-      actionpack (= 5.1.6)
-      activesupport (= 5.1.6)
+    railties (5.1.4)
+      actionpack (= 5.1.4)
+      activesupport (= 5.1.4)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (3.0.0)
     raindrops (0.19.0)
-    rake (12.3.1)
+    rake (12.3.0)
     rake-compiler (1.0.4)
       rake
     rb-fsevent (0.9.8)
@@ -374,7 +373,7 @@ GEM
     thread_safe (0.3.6)
     tilt (2.0.7)
     trollop (2.1.2)
-    tzinfo (1.2.5)
+    tzinfo (1.2.3)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)