diff --git a/Casks/firefox-esr-uk.rb b/Casks/firefox-esr-uk.rb
index 6b5fe9fb6..512d6be08 100644
--- a/Casks/firefox-esr-uk.rb
+++ b/Casks/firefox-esr-uk.rb
@@ -1,6 +1,6 @@
 cask 'firefox-esr-uk' do
-  version '45.0'
-  sha256 '255124f6ed60056b2e4f96428b773d007dc1883d6600462d404388e803ba0f79'
+  version '45.2.0'
+  sha256 '94e8d474688c5d1e084dab88e50b5568cdc675ada401adb0bd8d472c1b1bf0da'
 
   url "https://download-installer.cdn.mozilla.net/pub/firefox/releases/#{version}esr/mac/uk/Firefox%20#{version}esr.dmg"
   name 'Mozilla Firefox'