diff --git a/Gemfile b/Gemfile
index e2c1acfef..f30415665 100644
--- a/Gemfile
+++ b/Gemfile
@@ -39,6 +39,7 @@ group :production do
   gem 'aws-ses'
   gem 'qiniu', '~> 6.5.1'
   gem 'http', '~> 1.0'
+  gem 'nokogiri', '~> 1.8.5'
 end
 
 gem 'rspec'
diff --git a/Gemfile.lock b/Gemfile.lock
index ee5490f4a..08508cecc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,7 @@ GEM
       net-ssh (>= 2.6.5)
     net-ssh (3.2.0)
     netrc (0.11.0)
-    nokogiri (1.8.2)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     open4 (1.3.0)
     pagerduty (2.0.0)
@@ -222,6 +222,7 @@ DEPENDENCIES
   net-scp
   net-sftp
   net-ssh
+  nokogiri (~> 1.8.5)
   open4
   pagerduty
   pry
@@ -237,4 +238,4 @@ DEPENDENCIES
   yard
 
 BUNDLED WITH
-   1.16.1
+   1.16.2
diff --git a/backup.gemspec b/backup.gemspec
index 59d73e9a9..e2fed21a9 100644
--- a/backup.gemspec
+++ b/backup.gemspec
@@ -79,7 +79,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'net-sftp', '= 2.1.2'
   gem.add_dependency 'net-ssh', '= 3.2.0'
   gem.add_dependency 'netrc', '= 0.11.0'
-  gem.add_dependency 'nokogiri', '= 1.8.2'
+  gem.add_dependency 'nokogiri', '= 1.8.5'
   gem.add_dependency 'open4', '= 1.3.0'
   gem.add_dependency 'pagerduty', '= 2.0.0'
   gem.add_dependency 'public_suffix', '= 3.0.2'