diff --git a/Gemfile.lock b/Gemfile.lock
index 97082b5..11decac 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,6 +6,7 @@ PATH
       bootsnap (>= 1.1.0)
       bundler
       diff-lcs
+      dig_rb (~> 1.0.0)
       draper (~> 3.0)
       fluent-plugin-elasticsearch (~> 2.10)
       fluent-plugin-mongo (~> 1.1)
@@ -158,9 +159,9 @@ GEM
       elasticsearch
       excon
       fluentd (>= 0.14.20)
-    fluent-plugin-mongo (1.1.1)
+    fluent-plugin-mongo (1.1.2)
       fluentd (>= 0.14.12, < 2)
-      mongo (~> 2.2.0)
+      mongo (~> 2.6.0)
     fluent-plugin-s3 (1.1.3)
       aws-sdk-s3 (~> 1.0)
       aws-sdk-sqs (~> 1.0)
@@ -230,8 +231,8 @@ GEM
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
-    mongo (2.2.7)
-      bson (~> 4.0)
+    mongo (2.6.1)
+      bson (>= 4.3.0, < 5.0.0)
     msgpack (1.2.4)
     multi_json (1.13.1)
     multipart-post (2.0.0)
@@ -302,7 +303,7 @@ GEM
       sexp_processor (~> 4.9)
     rubyzip (1.2.1)
     safe_yaml (1.0.4)
-    sass (3.5.6)
+    sass (3.5.7)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)