diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index ee825f6..3dba2dd 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,12 +1,12 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 180`
-# on 2023-04-04 23:31:01 UTC using RuboCop version 1.49.0.
+# on 2023-05-23 23:30:57 UTC using RuboCop version 1.51.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 8
+# Offense count: 9
 # Configuration parameters: EnforcedStyle, AllowedGems, Include.
 # SupportedStyles: Gemfile, gems.rb, gemspec
 # Include: **/*.gemspec, **/Gemfile, **/gems.rb
@@ -137,15 +137,6 @@ Style/KeywordParametersOrder:
   Exclude:
     - 'lib/china_bank/payroll_text_file/line.rb'
 
-# Offense count: 3
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: literals, strict
-Style/MutableConstant:
-  Exclude:
-    - 'lib/china_bank/payroll_text_file/line.rb'
-    - 'lib/china_bank/payroll_text_file/version.rb'
-
 # Offense count: 2
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: PreferredDelimiters.
diff --git a/lib/china_bank/payroll_text_file/line.rb b/lib/china_bank/payroll_text_file/line.rb
index 890611c..b110d5d 100644
--- a/lib/china_bank/payroll_text_file/line.rb
+++ b/lib/china_bank/payroll_text_file/line.rb
@@ -6,11 +6,11 @@ module PayrollTextFile
     class Line
       include ActiveModel::Model
 
-      AMOUNT_RANGE = BigDecimal("0")..BigDecimal("99999999999.99")
+      AMOUNT_RANGE = (BigDecimal("0")..BigDecimal("99999999999.99")).freeze
       TYPES = {
         credit: "C",
         debit: "D"
-      }
+      }.freeze
 
       attr_accessor :account_type,
                     :account_number,
diff --git a/lib/china_bank/payroll_text_file/version.rb b/lib/china_bank/payroll_text_file/version.rb
index a15f86a..c668b99 100644
--- a/lib/china_bank/payroll_text_file/version.rb
+++ b/lib/china_bank/payroll_text_file/version.rb
@@ -1,7 +1,7 @@
 # :nocov:
 module ChinaBank
   module PayrollTextFile
-    VERSION = "1.1.0"
+    VERSION = "1.1.0".freeze
   end
 end
 # :nocov: