diff --git a/colorls.gemspec b/colorls.gemspec
index 390117fd..4588341e 100644
--- a/colorls.gemspec
+++ b/colorls.gemspec
@@ -75,7 +75,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'ronn', '~> 0'
   spec.add_development_dependency 'rspec', '~> 3.7'
   spec.add_development_dependency 'rspec-its', '~> 1.2'
-  spec.add_development_dependency 'rubocop', '~> 1.39.0'
+  spec.add_development_dependency 'rubocop', '~> 1.44.0'
   spec.add_development_dependency 'rubocop-performance', '~> 1.15.0'
   spec.add_development_dependency 'rubocop-rake', '~> 0.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.17.0'
diff --git a/lib/colorls/core.rb b/lib/colorls/core.rb
index 7448e830..aa6a09b1 100644
--- a/lib/colorls/core.rb
+++ b/lib/colorls/core.rb
@@ -317,7 +317,7 @@ def long_info(content)
       line_array.push links if @hard_links_count
       line_array.push user_info(content) if @show_user
       line_array.push group_info(content.group) if @show_group
-      line_array.concat [size_info(content.size), mtime_info(content.mtime)]
+      line_array.push(size_info(content.size), mtime_info(content.mtime))
       line_array.join('   ')
     end
 
diff --git a/spec/color_ls/core_spec.rb b/spec/color_ls/core_spec.rb
index 6cce9dd8..907abbb7 100644
--- a/spec/color_ls/core_spec.rb
+++ b/spec/color_ls/core_spec.rb
@@ -55,7 +55,7 @@
         executable?: false
       )
 
-      allow(::Dir).to receive(:entries).and_return([camera])
+      allow(Dir).to receive(:entries).and_return([camera])
 
       allow(ColorLS::FileInfo).to receive(:new).and_return(file_info)
 
diff --git a/spec/color_ls/flags_spec.rb b/spec/color_ls/flags_spec.rb
index 33d3c927..d4e8992a 100644
--- a/spec/color_ls/flags_spec.rb
+++ b/spec/color_ls/flags_spec.rb
@@ -149,8 +149,8 @@
     end
 
     it 'returns no user / group info' do
-      allow(::Etc).to receive(:getpwuid).and_return(nil)
-      allow(::Etc).to receive(:getgrgid).and_return(nil)
+      allow(Etc).to receive(:getpwuid).and_return(nil)
+      allow(Etc).to receive(:getgrgid).and_return(nil)
 
       expect { subject }.to output(/\s+  \d+  \s+  \d+  .*  a.txt/mx).to_stdout
     end
@@ -338,7 +338,7 @@
     let(:args) { ['--snafu'] }
 
     it 'issues a warning, hint about `--help` and exit' do # rubocop:todo RSpec/MultipleExpectations
-      allow(::Kernel).to receive(:warn) do |message|
+      allow(Kernel).to receive(:warn) do |message|
         expect(message).to output '--snafu'
       end