diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 4ca68ff..756237e 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -33,13 +33,6 @@ Metrics/MethodLength:
 Metrics/PerceivedComplexity:
   Max: 12
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Performance/StringReplacement:
-  Exclude:
-    - 'app/models/notification_services/gtalk_service.rb'
-    - 'lib/hoptoad/v2.rb'
-
 # Offense count: 4
 # Cop supports --auto-correct.
 # Configuration parameters: Include.
diff --git a/app/models/notification_services/gtalk_service.rb b/app/models/notification_services/gtalk_service.rb
index a209925..71fd68c 100644
--- a/app/models/notification_services/gtalk_service.rb
+++ b/app/models/notification_services/gtalk_service.rb
@@ -60,7 +60,7 @@ class NotificationServices::GtalkService < NotificationService
   private
  
   def send_to_users client, message
-    user_id.gsub(/ /i, ",").gsub(/;/i, ",").split(",").map(&:strip).reject(&:empty?).each do |user|
+    user_id.tr(' ', ",").tr(';', ",").split(",").map(&:strip).reject(&:empty?).each do |user|
       client.send(Jabber::Message.new(user, message))
     end
   end
diff --git a/lib/hoptoad/v2.rb b/lib/hoptoad/v2.rb
index 40bd937..73099f3 100644
--- a/lib/hoptoad/v2.rb
+++ b/lib/hoptoad/v2.rb
@@ -36,7 +36,7 @@ module Hoptoad
     end
 
     def self.normalize_key(key)
-      key.gsub('.', '_')
+      key.tr('.', '_')
     end
 
     def self.normalize(notice)
--
libgit2 0.21.2