diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9a28ac8..7bf7b71 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.6, 2.7, '3.0', 3.1]
+        ruby: ['3.0', 3.1, 3.2, 3.3, 3.4]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/enumerations.gemspec b/enumerations.gemspec
index efbf02c..2fc228a 100644
--- a/enumerations.gemspec
+++ b/enumerations.gemspec
@@ -1,4 +1,6 @@
-require File.expand_path('../lib/enumerations/version', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/enumerations/version', __dir__)
 
 Gem::Specification.new do |s|
   s.name        = 'enumerations'
@@ -8,8 +10,9 @@ Gem::Specification.new do |s|
   s.description = 'Extends ActiveRecord with enumeration capabilites.'
   s.homepage    = 'https://github.com/infinum/enumerations'
   s.license     = 'MIT'
+  s.required_ruby_version = '>= 3.0'
 
-  s.authors     = [
+  s.authors = [
     'Tomislav Car', 'Nikica Jokić', 'Nikola Santić', 'Stjepan Hadjić', 'Petar Ćurković'
   ]
 
diff --git a/test/helpers/test_helper.rb b/test/helpers/test_helper.rb
index 61d8b65..b23a18a 100644
--- a/test/helpers/test_helper.rb
+++ b/test/helpers/test_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'simplecov'
 SimpleCov.start
 
@@ -10,9 +12,9 @@
 require_relative 'locale_helper'
 
 class Status < Enumerations::Base
-  values draft:           { id: 1, name: 'Draft' },
-         review_pending:  { id: 2, name: 'Review pending' },
-         published:       { id: 3, name: 'Published' }
+  values draft: { id: 1, name: 'Draft' },
+         review_pending: { id: 2, name: 'Review pending' },
+         published: { id: 3, name: 'Published' }
 
   value :none,    id: 4, name: 'None', visible: true, deleted: false
   value :deleted, id: 5, deleted: true