diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index d8b4bb3..6c592a7 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2016-11-14 18:28:34 +0300 using RuboCop version 0.45.0.
+# on 2017-05-25 14:46:57 +0300 using RuboCop version 0.49.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
diff --git a/Changelog.md b/Changelog.md
index 49e55f9..450144c 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,9 @@
 # Change log
 
-# 1.0.0
+## master (unrelased)
+* Fix RuboCop 0.49 warnings (minor speedup by `Performance/Caller` cop)
+
+## 1.0.0
 * Shorter call `OnlyofficeLoggerHelper.log` instead of longer variant `OnlyofficeLoggerHelper::log.print_to_log`
 
 ## 0.0.1
diff --git a/lib/onlyoffice_logger_helper/logger_helper.rb b/lib/onlyoffice_logger_helper/logger_helper.rb
index 669edd8..b450c1c 100644
--- a/lib/onlyoffice_logger_helper/logger_helper.rb
+++ b/lib/onlyoffice_logger_helper/logger_helper.rb
@@ -1,7 +1,7 @@
 # Module for output stuff in console
 module OnlyofficeLoggerHelper
   def self.log(entry, color_code = nil)
-    caller_name = caller[0].to_s[/\w+.rb/].chomp('.rb')
+    caller_name = caller(1..1).first.to_s[/\w+.rb/].chomp('.rb')
     time_stamp = Time.now.strftime('%T/%d.%m.%y')
     message = "#{time_stamp}    [#{caller_name}] #{entry}"
     color_code ? puts(colorize(message, color_code)) : puts(message)
diff --git a/onlyoffice_logger_helper.gemspec b/onlyoffice_logger_helper.gemspec
index a177557..50763c7 100644
--- a/onlyoffice_logger_helper.gemspec
+++ b/onlyoffice_logger_helper.gemspec
@@ -1,4 +1,3 @@
-# coding: utf-8
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'onlyoffice_logger_helper/version'
@@ -7,7 +6,7 @@ Gem::Specification.new do |spec|
   spec.name          = 'onlyoffice_logger_helper'
   spec.version       = OnlyofficeLoggerHelper::VERSION
   spec.authors       = ['ONLYOFFICE', 'Pavel Lobashov', 'Roman Zagudaev']
-  spec.email         = %w(shockwavenn@gmail.com rzagudaev@gmail.com)
+  spec.email         = %w[shockwavenn@gmail.com rzagudaev@gmail.com]
 
   spec.summary       = 'Simple logging gem for ONLYOFFICE projects'
   spec.description   = 'Simple logging gem for ONLYOFFICE projects. Used in QA'