diff --git a/lib/masking/cli.rb b/lib/masking/cli.rb
index e0f42a3..2daeab6 100644
--- a/lib/masking/cli.rb
+++ b/lib/masking/cli.rb
@@ -44,7 +44,7 @@ def define_config_option(parser)
     def define_version_option(parser)
       parser.on('-v', '--version', 'version') do
         puts Masking::VERSION
-        exit(true)
+        exit
       end
     end
   end
diff --git a/lib/masking/insert_statement.rb b/lib/masking/insert_statement.rb
index 26e0f4a..1c9ef87 100644
--- a/lib/masking/insert_statement.rb
+++ b/lib/masking/insert_statement.rb
@@ -79,7 +79,7 @@ def values_regexp
     #   e.g. INSERT ... VALUES (123,'string ),( abc'),(456,'ab');
     # refs: implementation of parsing CSV on ruby standard library FasterCSV (ja): https://www.clear-code.com/blog/2018/12/25.html
     def recursive_pattern_value_concat!(value_rows, index)
-      return if value_rows[index].gsub(/\\\\/, '').gsub(/\\'/, '').count(?').even?
+      return if value_rows[index].gsub('\\\\', '').gsub("\\'", '').count(?').even?
 
       # make destructive change for values_rows
       value_rows[index] += VALUE_ROW_SPLITTER + value_rows.delete_at(index + 1)
diff --git a/spec/masking/cli_spec.rb b/spec/masking/cli_spec.rb
index 67c937c..1dec739 100644
--- a/spec/masking/cli_spec.rb
+++ b/spec/masking/cli_spec.rb
@@ -27,7 +27,7 @@
 
     shared_examples 'print Version and exit' do
       it do
-        expect { subject }.to raise_error(SystemExit) & \
+        expect { subject }.to raise_error(SystemExit) &
                               output("#{Masking::VERSION}\n").to_stdout
       end
 
@@ -75,7 +75,7 @@
 
       shared_examples 'with errormessage and exitstatus is 1' do |error_text|
         it do
-          expect { subject }.to raise_error(SystemExit) & \
+          expect { subject }.to raise_error(SystemExit) &
                                 output(error_text).to_stderr
         end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 147c960..06cd512 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,7 +5,7 @@
 require 'tapp'
 require 'simplecov'
 
-if ENV['CI'] == 'true' && \
+if ENV['CI'] == 'true' &&
    # compare only for major/minor version of Ruby in order to enable report for Coverall
    Gem::Version.new(RUBY_VERSION).segments[0..1] == \
    Gem::Version.new(File.read(File.join(File.dirname(__FILE__), '../.ruby-version'))).segments[0..1]