diff --git a/Casks/stack.rb b/Casks/stack.rb
index 9bf1aacf9f..3197113b4d 100644
--- a/Casks/stack.rb
+++ b/Casks/stack.rb
@@ -1,10 +1,10 @@
 cask 'stack' do
-  version '2.6.2.20200306'
-  sha256 'f3b03c6a3a6f4bdafdceb2a7c626ed473cdb127e8254a517c4c998d5c286eabd'
+  version '2.6.4.20200506'
+  sha256 '676241a70d26832f8910bdeb64e5c44f8ff265a27b1267c2daf15beefe4e4a00'
 
   # transip.net/stack/ was verified as official when first introduced to the cask
   url "https://mirror.transip.net/stack/software/osx/stack-#{version}.pkg"
-  appcast 'https://mirror.transip.net/stack/update/?version=0.0.0&platform=macos&oem=stack&versionsuffix=&sparkle=true'
+  appcast 'https://mirror.transip.net/stack/update/?version=0.0.0&platform=macos&oem=stack&versionsuffix=&updatesegment=18&sparkle=true'
   name 'STACK'
   homepage 'https://www.transip.nl/stack'