diff --git a/Casks/firefox-esr.rb b/Casks/firefox-esr.rb
index 77439b491..482db91d7 100644
--- a/Casks/firefox-esr.rb
+++ b/Casks/firefox-esr.rb
@@ -1,6 +1,6 @@
 cask 'firefox-esr' do
-  version '38.5.2'
-  sha256 '10d76f41fcec23f5b8af4ed1b271c78950c980b66c5e9021e9cf93daaf8a43da'
+  version '38.6.0'
+  sha256 '4bd7e28da15996957654adfb69e5b8450da9fe8627664d8cbaec7cc9be77a480'
 
   url "https://download-installer.cdn.mozilla.net/pub/firefox/releases/#{version}esr/mac/en-US/Firefox%20#{version}esr.dmg"
   name 'Mozilla Firefox'