diff --git a/Gemfile b/Gemfile
index 65aefa7b..d0342d3a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,6 +12,7 @@ gem 'html2rss-configs', github: 'html2rss/html2rss-configs'
 # gem 'html2rss-configs', path: '../html2rss-configs'
 
 gem 'erubi'
+gem 'parallel'
 gem 'rack-cache'
 gem 'rack-timeout'
 gem 'rack-unreloader'
diff --git a/Gemfile.lock b/Gemfile.lock
index e4a7acbb..d3653a11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,6 +150,7 @@ DEPENDENCIES
   erubi
   html2rss
   html2rss-configs!
+  parallel
   puma
   rack-cache
   rack-timeout
diff --git a/app/health_check.rb b/app/health_check.rb
index 9a363b61..f0c56094 100644
--- a/app/health_check.rb
+++ b/app/health_check.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'parallel'
+
 require_relative 'local_config'
 
 module App
@@ -44,7 +46,7 @@ def run
     # @return [Array<String>]
     def errors
       [].tap do |errors|
-        LocalConfig.feed_names.each do |feed_name|
+        Parallel.each(LocalConfig.feed_names, in_threads: 4) do |feed_name|
           Html2rss.feed_from_yaml_config(LocalConfig::CONFIG_FILE, feed_name.to_s).to_s
         rescue StandardError => e
           errors << "[#{feed_name}] #{e.class}: #{e.message}"