diff --git a/fluentd/Gemfile b/fluentd/Gemfile
index 7fb7ddb9a..bf3e2e41e 100644
--- a/fluentd/Gemfile
+++ b/fluentd/Gemfile
@@ -17,6 +17,7 @@ gem 'fluent-plugin-splunk-hec', '1.3.2'
 gem 'fluent-plugin-label-router'
 gem 'libxml-ruby' #aws-sdk-core
 gem 'typhoeus' # gems that supports elasticsearch
+gem 'webrick',  '1.8.2'
 
 # gems that support fluentd
 gem 'oj'
diff --git a/fluentd/Gemfile.lock b/fluentd/Gemfile.lock
index cf9a22d75..7ae8b0f83 100644
--- a/fluentd/Gemfile.lock
+++ b/fluentd/Gemfile.lock
@@ -280,7 +280,7 @@ GEM
       activesupport
       faraday (~> 1.7)
       faraday_middleware (~> 1.1)
-    webrick (1.8.1)
+    webrick (1.8.2)
     yajl-ruby (1.4.3)
 
 PLATFORMS
@@ -319,6 +319,7 @@ DEPENDENCIES
   remote_syslog_sender!
   syslog_protocol!
   typhoeus
+  webrick (= 1.8.2)
 
 BUNDLED WITH
    2.3.7