diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 6127c6a..81aeaed 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 180`
-# on 2024-01-16 23:33:30 UTC using RuboCop version 1.60.0.
+# on 2024-01-18 23:34:08 UTC using RuboCop version 1.60.1.
 # 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
@@ -263,14 +263,6 @@ Metrics/MethodLength:
 Metrics/ParameterLists:
   Max: 6
 
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyleForLeadingUnderscores.
-# SupportedStylesForLeadingUnderscores: disallowed, required, optional
-Naming/MemoizedInstanceVariableName:
-  Exclude:
-    - 'lib/excel_templating/render_helper.rb'
-
 # Offense count: 1
 # Configuration parameters: NamePrefix, ForbiddenPrefixes, AllowedMethods, MethodDefinitionMacros.
 # NamePrefix: is_, has_, have_
@@ -291,16 +283,6 @@ Style/Alias:
     - 'lib/excel_templating/excel_abstraction/cell_range.rb'
     - 'lib/excel_templating/excel_abstraction/row.rb'
 
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowOnlyRestArgument, UseAnonymousForwarding, RedundantRestArgumentNames, RedundantKeywordRestArgumentNames, RedundantBlockArgumentNames.
-# RedundantRestArgumentNames: args, arguments
-# RedundantKeywordRestArgumentNames: kwargs, options, opts
-# RedundantBlockArgumentNames: blk, block, proc
-Style/ArgumentsForwarding:
-  Exclude:
-    - 'lib/excel_templating/document.rb'
-
 # Offense count: 7
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, AllowedMethods, AllowedPatterns, AllowBracesOnProceduralOneLiners, BracesRequiredMethods.
diff --git a/lib/excel_templating/render_helper.rb b/lib/excel_templating/render_helper.rb
index 87a0f8c..19fee53 100644
--- a/lib/excel_templating/render_helper.rb
+++ b/lib/excel_templating/render_helper.rb
@@ -8,7 +8,7 @@ def letter_for(one_based_index)
       private
 
       def letters
-        @row_letters ||= ('A' .. 'ZZ').to_a
+        @letters ||= ('A' .. 'ZZ').to_a
       end
     end
   end