diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 74d2c52..b621a07 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.7', '3.0', '3.1', '3.2']
+        ruby-version: ['3.0', '3.1', '3.2', '3.3']
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.rubocop.yml b/.rubocop.yml
index f972fb6..b34b8e4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -5,7 +5,7 @@ require:
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 2.7
+  TargetRubyVersion: 3.0
 
 Layout/EmptyLinesAroundAttributeAccessor:
   Enabled: true
diff --git a/Gemfile b/Gemfile
index f069748..c8110ce 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,12 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in henkei.gemspec
 gemspec
+
+gem 'bundler', '~> 2.0'
+gem 'rake', '~> 12.3'
+gem 'rspec', '~> 3.7'
+gem 'rubocop', '~> 1.26'
+gem 'rubocop-performance', '~> 1.13'
+gem 'rubocop-rake', '~> 0.6'
+gem 'rubocop-rspec', '~> 2.9'
+gem 'simplecov', '~> 0.15', '< 0.18'
diff --git a/henkei.gemspec b/henkei.gemspec
index 5a4cd22..5ca6637 100644
--- a/henkei.gemspec
+++ b/henkei.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |spec|
                        '(.doc, .docx, .pages, .odt, .rtf, .pdf) using Apache Tika toolkit'
   spec.homepage      = 'https://github.com/abrom/henkei'
   spec.license       = 'MIT'
-  spec.required_ruby_version = ['>= 2.7.0', '< 3.3.0']
+  spec.required_ruby_version = ['>= 3.0.0', '< 3.4.0']
 
   # Prevent pushing this gem to RubyGems.org by setting 'allowed_push_host', or
   # delete this section to allow pushing this gem to any host.
@@ -30,14 +30,4 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'json', '>= 1.8', '< 3'
   spec.add_runtime_dependency 'mini_mime', '>= 0.1.1', '< 2'
-
-  spec.add_development_dependency 'bundler', '~> 2.0'
-  spec.add_development_dependency 'rails', '~> 5.0'
-  spec.add_development_dependency 'rake', '~> 12.3'
-  spec.add_development_dependency 'rspec', '~> 3.7'
-  spec.add_development_dependency 'rubocop', '~> 1.26'
-  spec.add_development_dependency 'rubocop-performance', '~> 1.13'
-  spec.add_development_dependency 'rubocop-rake', '~> 0.6'
-  spec.add_development_dependency 'rubocop-rspec', '~> 2.9'
-  spec.add_development_dependency 'simplecov', '~> 0.15', '< 0.18'
 end
diff --git a/lib/henkei.rb b/lib/henkei.rb
index 9092e4b..d37c4db 100644
--- a/lib/henkei.rb
+++ b/lib/henkei.rb
@@ -268,7 +268,7 @@ def self.server_read(data)
     resp = +''
     loop do
       chunk = s.recv(65_536)
-      break if chunk.empty? || !chunk
+      break if !chunk || chunk.empty?
 
       resp << chunk
     end