diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 01fb0c2f..f4d09cf3 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -71,9 +71,3 @@ Naming/AccessorMethodName:
 Naming/BinaryOperatorParameterName:
   Exclude:
     - 'lib/pry/method.rb'
-
-# Offense count: 5
-Naming/ConstantName:
-  Exclude:
-    - 'lib/pry/input_completer.rb'
-    - 'spec/completion_spec.rb'
diff --git a/lib/pry/input_completer.rb b/lib/pry/input_completer.rb
index 7ff93030..1b54613d 100644
--- a/lib/pry/input_completer.rb
+++ b/lib/pry/input_completer.rb
@@ -15,7 +15,7 @@ class Pry
     GLOBALVARIABLE_REGEXP = /^(\$[^.]*)$/.freeze
     VARIABLE_REGEXP = /^([^."].*)\.([^.]*)$/.freeze
 
-    ReservedWords = %w[
+    RESERVED_WORDS = %w[
       BEGIN END
       alias and
       begin break
@@ -214,7 +214,7 @@ class Pry
             ).collect(&:to_s)
           end
           candidates =
-            (candidates | ReservedWords | custom_completions)
+            (candidates | RESERVED_WORDS | custom_completions)
               .grep(/^#{Regexp.quote(input)}/)
           candidates.collect(&path)
         end
diff --git a/spec/completion_spec.rb b/spec/completion_spec.rb
index dc2ea38d..4216ea74 100644
--- a/spec/completion_spec.rb
+++ b/spec/completion_spec.rb
@@ -99,16 +99,16 @@ describe Pry::InputCompleter do
 
     # Constant
     module Mod
-      remove_const :Con if defined? Con
-      Con = 'Constant'.freeze
+      remove_const :CON if defined? CON
+      CON = 'Constant'.freeze
       module Mod2
       end
     end
 
-    completer_test(Mod).call('Con')
+    completer_test(Mod).call('CON')
 
     # Constants or Class Methods
-    completer_test(o).call('Mod::Con')
+    completer_test(o).call('Mod::CON')
 
     # Symbol
     _foo = :symbol
@@ -132,10 +132,10 @@ describe Pry::InputCompleter do
     end
 
     module Baz
-      remove_const :Con if defined? Con
+      remove_const :CON if defined? CON
       @bar = Bar
       @bazvar = :baz
-      Con = :constant
+      CON = :constant
     end
 
     pry = Pry.new(target: Baz)
@@ -143,7 +143,7 @@ describe Pry::InputCompleter do
 
     b = Pry.binding_for(Bar)
     completer_test(b, pry).call("../@bazvar")
-    completer_test(b, pry).call('/Con')
+    completer_test(b, pry).call('/CON')
   end
 
   it 'should complete for stdlib symbols' do
@@ -172,16 +172,16 @@ describe Pry::InputCompleter do
 
     # Constant
     module Mod
-      remove_const :Con if defined? Con
-      Con = 'Constant'.freeze
+      remove_const :CON if defined? CON
+      CON = 'Constant'.freeze
       module Mod2
       end
     end
 
-    completer_test(Mod).call('Con')
+    completer_test(Mod).call('CON')
 
     # Constants or Class Methods
-    completer_test(o).call('Mod::Con')
+    completer_test(o).call('Mod::CON')
 
     # Symbol
     _foo = :symbol
@@ -205,10 +205,10 @@ describe Pry::InputCompleter do
     end
 
     module Baz
-      remove_const :Con if defined? Con
+      remove_const :CON if defined? CON
       @bar = Bar
       @bazvar = :baz
-      Con = :constant
+      CON = :constant
     end
 
     pry = Pry.new(target: Baz)
@@ -216,7 +216,7 @@ describe Pry::InputCompleter do
 
     b = Pry.binding_for(Bar)
     completer_test(b, pry).call("../@bazvar")
-    completer_test(b, pry).call('/Con')
+    completer_test(b, pry).call('/CON')
   end
 
   it 'should not return nil in its output' do