diff --git a/Casks/emacs-app-nightly.rb b/Casks/emacs-app-nightly.rb
index 447d6862..c7d75728 100644
--- a/Casks/emacs-app-nightly.rb
+++ b/Casks/emacs-app-nightly.rb
@@ -5,16 +5,16 @@ cask 'emacs-app-nightly' do
   desc 'GNU Emacs text editor (nightly build)'
   homepage 'https://github.com/jimeh/emacs-builds'
 
-  version '2025-08-24.45ffc0e.master'
+  version '2025-08-25.21b072c.master'
 
   on_arm do
-    sha256 '095f17f4726f440859cea790634eb5c813425c95211342d0309b793c0ac8d51f'
-    url 'https://github.com/jimeh/emacs-builds/releases/download/Emacs.2025-08-24.45ffc0e.master/Emacs.2025-08-24.45ffc0e.master.macOS-11.arm64.dmg'
+    sha256 'de4a60775ef8175be0b098fb6201f325f7447c6b6cd000baf1ddcd7dfc8132b3'
+    url 'https://github.com/jimeh/emacs-builds/releases/download/Emacs.2025-08-25.21b072c.master/Emacs.2025-08-25.21b072c.master.macOS-11.arm64.dmg'
     depends_on macos: '>= :big_sur'
   end
   on_intel do
-    sha256 'af24966aa4d8d7f605b25783b4ad9d45716cb65d6b42120adc7f3d682d099e44'
-    url 'https://github.com/jimeh/emacs-builds/releases/download/Emacs.2025-08-24.45ffc0e.master/Emacs.2025-08-24.45ffc0e.master.macOS-11.x86_64.dmg'
+    sha256 'a07d5457df8c830516a12818c5caf3494008dee32d927d517ba40e419546cbd0'
+    url 'https://github.com/jimeh/emacs-builds/releases/download/Emacs.2025-08-25.21b072c.master/Emacs.2025-08-25.21b072c.master.macOS-11.x86_64.dmg'
     depends_on macos: '>= :big_sur'
   end