diff --git a/fluent-package/update-gemfile.rb b/fluent-package/update-gemfile.rb
new file mode 100644
index 000000000..81bc814e4
--- /dev/null
+++ b/fluent-package/update-gemfile.rb
@@ -0,0 +1,115 @@
+#
+# Utility to update fluent-package-builder/fluent-package/Gemfile
+#
+
+require 'optparse'
+require 'open-uri'
+require 'json'
+require 'fileutils'
+begin
+  require 'term/ansicolor'
+rescue LoadError
+  puts "Prerequisite:\n\tgem install term-ansicolor"
+  exit 1
+end
+
+options = {
+  lts: false,
+  replace: true,
+  gemfile: "Gemfile"
+}
+
+opt = OptionParser.new
+opt.on("--lts", "LTS") {|v| options[:lts] = true }
+opt.on("--[no-]replace", "Specify whether Gemfile should be replaced or not") {|v| options[:replace] = v }
+opt.on("--gemfile", "Specify path of Gemfile") {|v| options[:gemfile] = v }
+paths = opt.parse!(ARGV)
+
+unless paths.empty?
+  gemfile_path = paths.select do |path|
+    path.end_with?("Gemfile")
+  end
+  options[:gemfile] = gemfile_path
+end
+
+class GemfileUpdateChecker
+  def initialize(options)
+    @options = options
+    @gemfile_path = options[:gemfile]
+    @new_gemfile_path = @gemfile_path + ".new"
+  end
+
+  def fetch_latest_version(gem, version)
+    base_version = version.split(".")[0..-2].join(".")
+    latest_version = version
+    message = ""
+    URI.open("https://rubygems.org/api/v1/gems/#{gem}.json") do |request|
+      fetched_version = JSON.parse(request.read)["version"]
+      if @options[:lts]
+        if Gem::Version.new(fetched_version) < Gem::Version.new("#{base_version.succ}")
+          latest_version = fetched_version
+        else
+          message = Term::ANSIColor.yellow { Term::ANSIColor.on_black { "WARN: skip #{gem} #{fetched_version} for LTS" }}
+        end
+      else
+        latest_version = fetched_version
+      end
+    end
+    [latest_version, message]
+  end
+
+  def show_latest_version(gem, version, latest_version, appendix = "")
+    if version != latest_version
+      puts "GEM: #{gem} #{version} => #{Term::ANSIColor.magenta { Term::ANSIColor.on_black{ latest_version }}} #{appendix}"
+    else
+      puts "GEM: #{gem} #{latest_version} #{appendix}"
+    end
+  end
+
+  def generate_updated_gemfile
+    contents = ""
+    File.open(@gemfile_path, "r") do |gemfile|
+      gemfile.readlines.each do |line|
+        if line.start_with?("gem")
+          if line =~ /^gem "(.+)", "(.+)"(.*)/
+            plugin=$1
+            version=$2
+            rest=$3
+            latest_version, warning = fetch_latest_version(plugin, version)
+            show_latest_version(plugin, version, latest_version, warning)
+            contents << "gem \"#{plugin}\", \"#{latest_version}\"#{rest}\n"
+          elsif line =~ /^gem "(.+)", '(.+)'/
+            plugin=$1
+            version=$2
+            latest_version, warning = fetch_latest_version(plugin, version)
+            show_latest_version(plugin, version, latest_version, warning)
+            contents << "gem \"#{plugin}\", \"#{latest_version}\"\n"
+          else
+            contents << line
+          end
+        else
+          contents << line
+        end
+      end
+    end
+    contents
+  end
+
+  def run
+    File.open(@new_gemfile_path, "w+") do |gemfile|
+      contents = generate_updated_gemfile
+      gemfile.puts(contents)
+      puts "#{@new_gemfile_path} was generated successfully"
+    end
+    if @options[:replace]
+      FileUtils.cp(@new_gemfile_path, @gemfile_path)
+      puts "#{@gemfile_path} was replaced with #{@new_gemfile_path} successfully"
+    else
+      puts "#{@gemfile_path} was not replaced with #{@new_gemfile_path}"
+    end
+  end
+end
+
+checker = GemfileUpdateChecker.new(options)
+checker.run
+