diff --git a/Casks/firefox-esr.rb b/Casks/firefox-esr.rb
index 970d1a10d..a5e63e593 100644
--- a/Casks/firefox-esr.rb
+++ b/Casks/firefox-esr.rb
@@ -1,6 +1,6 @@
 cask 'firefox-esr' do
-  version '45.1.1'
-  sha256 '0f3b42692237456af0c8989ef51f7487a462380c67adbe4c130ab253d5226f51'
+  version '45.2.0'
+  sha256 '789e708ca817ceccfd9075826f16b95023752be0a868abe491c3dc7875e7926c'
 
   url "https://download-installer.cdn.mozilla.net/pub/firefox/releases/#{version}esr/mac/en-US/Firefox%20#{version}esr.dmg"
   name 'Mozilla Firefox'