diff --git a/Gemfile.lock b/Gemfile.lock
index 9c43d96..a634fa3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,8 @@ PATH
   remote: .
   specs:
     crono (1.1.2)
-      rails (>= 4.0)
+      rails (>= 5.2.8)
+
 
 GEM
   remote: https://rubygems.org/
@@ -61,6 +62,12 @@ GEM
       marcel (~> 0.3.1)
       mimemagic (~> 0.3.2)
     activesupport (6.1.2.1)
+    activemodel (7.0.3)
+      activesupport (= 7.0.3)
+    activerecord (7.0.3)
+      activemodel (= 7.0.3)
+      activesupport (= 7.0.3)
+    activesupport (7.0.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
@@ -168,16 +175,66 @@ PLATFORMS
   arm64-darwin-20
 
 DEPENDENCIES
+    byebug (11.1.3)
+    concurrent-ruby (1.1.10)
+    daemons (1.4.1)
+    diff-lcs (1.5.0)
+    haml (5.2.2)
+      temple (>= 0.8.0)
+      tilt
+    i18n (1.10.0)
+      concurrent-ruby (~> 1.0)
+    minitest (5.15.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.3.1)
+    rack-protection (2.2.0)
+      rack
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rake (13.0.6)
+    rspec (3.11.0)
+      rspec-core (~> 3.11.0)
+      rspec-expectations (~> 3.11.0)
+      rspec-mocks (~> 3.11.0)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-support (3.11.0)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
+    sqlite3 (1.4.2)
+    temple (0.8.2)
+    tilt (2.0.10)
+    timecop (0.9.5)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+
+PLATFORMS
+  arm64-darwin-21
+
+DEPENDENCIES
+  bundler (>= 2)
   byebug
   combustion (~> 1.3)
   crono!
   daemons
   rack-test
-  rake (>= 10.0)
-  rspec (>= 3.0)
-  rspec-rails (>= 4.0)
+  rake (>= 13.0.1)
+  rspec (>= 3.10)
+  sinatra
   sqlite3
   timecop (>= 0.7)
 
 BUNDLED WITH
-   2.2.7
+   2.3.14
+
diff --git a/README.md b/README.md
index c8e629f..cdfeb1d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Crono — Job scheduler for Rails
+Job scheduler for Rails
 ------------------------
 [![Gem Version](https://badge.fury.io/rb/crono.svg)](http://badge.fury.io/rb/crono)
 [![Build Status](https://travis-ci.org/plashchynski/crono.svg?branch=master)](https://travis-ci.org/plashchynski/crono)
@@ -7,6 +7,9 @@ Crono — Job scheduler for Rails
 
 Crono is a time-based background job scheduler daemon (just like Cron) for Ruby on Rails.
 
+## Deprecated
+
+Unfortunately, I don't have time to support this project.
 
 ## The Purpose
 
diff --git a/bin/console b/bin/console
deleted file mode 100755
index db0b023..0000000
--- a/bin/console
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/usr/bin/env ruby
-
-require "bundler/setup"
-require "crono"
-
-# You can add fixtures and/or initialization code here to make experimenting
-# with your gem easier. You can also use a different console, if you like.
-
-# (If you use this, don't forget to add pry to your Gemfile!)
-# require "pry"
-# Pry.start
-
-require "irb"
-IRB.start
diff --git a/exe/crono b/bin/crono
similarity index 100%
rename from exe/crono
rename to bin/crono
diff --git a/bin/setup b/bin/setup
deleted file mode 100644
index b65ed50..0000000
--- a/bin/setup
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-set -euo pipefail
-IFS=$'\n\t'
-
-bundle install
-
-# Do any other automated setup that you need to do here
diff --git a/crono.gemspec b/crono.gemspec
index 9e046b4..a3795c2 100644
--- a/crono.gemspec
+++ b/crono.gemspec
@@ -1,21 +1,32 @@
+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
 require_relative 'lib/crono/version'
 
-Gem::Specification.new do |spec|
-  spec.name          = 'crono'
-  spec.version       = Crono::VERSION
-  spec.authors       = ['Dzmitry Plashchynski']
-  spec.email         = ['plashchynski@gmail.com']
+Gem::Specification.new do |s|
+  s.name          = 'crono'
+  s.version       = Crono::VERSION
+  s.authors       = ['Dzmitry Plashchynski']
+  s.email         = ['plashchynski@gmail.com']
 
-  spec.summary       = 'Job scheduler for Rails'
-  spec.description   = 'A time-based background job scheduler daemon (just like Cron) for Rails'
-  spec.homepage      = 'https://github.com/plashchynski/crono'
-  spec.license       = 'Apache-2.0'
+  s.summary       = 'Job scheduler for Rails'
+  s.description   = 'A time-based background job scheduler daemon (just like Cron) for Rails'
+  s.homepage      = 'https://github.com/plashchynski/crono'
+  s.license       = 'Apache-2.0'
 
-  spec.files = Dir['{app,config,db,lib}/**/*', 'LICENSE', 'Rakefile', 'README.rdoc']
-  spec.bindir        = 'exe' # http://bundler.io/blog/2015/03/20/moving-bins-to-exe.html
-  spec.executables   = ['crono']
-  spec.require_paths = ['lib']
-  spec.test_files = Dir['spec/**/*']
+  s.files = Dir['{app,config,db,lib}/**/*', 'LICENSE', 'Rakefile', 'README.rdoc']
+  s.test_files = Dir['spec/**/*']
+  s.executables   = ['crono']
+  s.require_paths = ["lib"]
 
-  spec.add_dependency 'rails', '>= 4.0'
+  s.add_dependency 'rails', '>= 5.2.8'
+  s.add_development_dependency 'rake', '>= 13.0.1'
+  s.add_development_dependency 'bundler', '>= 2'
+  s.add_development_dependency 'rspec', '>= 3.10'
+  s.add_development_dependency 'timecop', '>= 0.7'
+  s.add_development_dependency 'sqlite3'
+  s.add_development_dependency 'byebug'
+  s.add_development_dependency 'sinatra'
+  s.add_development_dependency 'haml'
+  s.add_development_dependency 'rack-test'
+  s.add_development_dependency 'daemons'
 end
diff --git a/lib/crono/period.rb b/lib/crono/period.rb
index 802145e..ffa9b62 100644
--- a/lib/crono/period.rb
+++ b/lib/crono/period.rb
@@ -78,7 +78,8 @@ module Crono
     end
 
     def time_atts
-      { hour: @at_hour, min: @at_min }.compact
+      atts = { hour: @at_hour, min: @at_min }
+      atts.respond_to?(:compact) ? atts.compact : atts.select { |_, value| !value.nil? }
     end
   end
 end