diff --git a/Casks/firefox.rb b/Casks/firefox.rb
index 737741c919d..048823468f4 100644
--- a/Casks/firefox.rb
+++ b/Casks/firefox.rb
@@ -1,10 +1,10 @@
 cask 'firefox' do
-  version '45.0.0'
+  version '45.0.1'
   sha256 '2eb674c00e35357dcb18a5642f19422cf086e72d42562346ae48aa1e3f29802a'
 
   url "https://ftp.mozilla.org/pub/firefox/releases/#{version.major_minor}/mac/en-US/Firefox%20#{version.major_minor}.dmg"
   appcast "https://aus5.mozilla.org/update/3/Firefox/#{version}/0/Darwin_x86_64-gcc3-u-i386-x86_64/en-US/release/Darwin%2015.3.0/default/default/update.xml?force=1",
-          checkpoint: 'c82e11d0ac89e159a538cb614d4ae90e9232e9f761910222c92c3fa8938dcfbe'
+          checkpoint: '9aa94b34be9931f59c0d24a5b9088a886f6fae79095a6ba880c673a236f22457'
   name 'Mozilla Firefox'
   homepage 'https://www.mozilla.org/en-US/firefox/'
   license :mpl