diff --git a/Casks/firefox-esr-uk.rb b/Casks/firefox-esr-uk.rb
index d0454c374..c0a7f8642 100644
--- a/Casks/firefox-esr-uk.rb
+++ b/Casks/firefox-esr-uk.rb
@@ -1,11 +1,18 @@
 cask :v1 => 'firefox-esr-uk' do
-  version '38.0.1'
-  sha256 'a403737175eee03b449762aef6d87f1ddf889747e65ed6384214123bd31d7896'
+  version '38.2.1'
+  sha256 '0b2fbdd4569724b3b7fc61c6496193c9d1e6c273636eb081ffb99d0130f4a375'
 
   url "https://download.mozilla.org/?product=firefox-#{version}esr-SSL&os=osx&lang=uk"
+  name 'Firefox'
+  name 'Mozilla Firefox'
   homepage 'https://www.mozilla.org/uk/firefox/organizations/'
   license :mpl
   tags :vendor => 'Mozilla'
 
   app 'Firefox.app'
+  
+  zap :delete => [
+                  '~/Library/Application Support/Firefox',
+                  '~/Library/Caches/Firefox',
+                 ]
 end