diff --git a/Casks/emacs-app-nightly/meta.json b/Casks/emacs-app-nightly/meta.json
index 744dc191..8c9130c9 100644
--- a/Casks/emacs-app-nightly/meta.json
+++ b/Casks/emacs-app-nightly/meta.json
@@ -7,13 +7,13 @@
   ],
   "desc": "GNU Emacs text editor (nightly build)",
   "homepage": "https://github.com/jimeh/emacs-builds",
-  "url": "https://github.com/jimeh/emacs-builds/releases/download/Emacs.2021-12-19.1ffb757.master/Emacs.2021-12-19.1ffb757.master.macOS-10-15.x86_64.dmg",
+  "url": "https://github.com/jimeh/emacs-builds/releases/download/Emacs.2021-12-20.aa1fdb3.master/Emacs.2021-12-20.aa1fdb3.master.macOS-10-15.x86_64.dmg",
   "appcast": null,
-  "version": "2021-12-19.1ffb757.master",
+  "version": "2021-12-20.aa1fdb3.master",
   "versions": {},
   "installed": null,
   "outdated": false,
-  "sha256": "2ab40ba7b0d7189258a41d7b8188211e7b27fcde6810e6898f70bab6c158869d",
+  "sha256": "047ff1b9da76f47f1e05bd373cc6295f43f9835af9ed4ba07d4d3e1557f10185",
   "artifacts": [
     [
       "Emacs.app"
diff --git a/Casks/emacs-app-nightly/shield.json b/Casks/emacs-app-nightly/shield.json
index 11d40b7f..c4e64af7 100644
--- a/Casks/emacs-app-nightly/shield.json
+++ b/Casks/emacs-app-nightly/shield.json
@@ -5,5 +5,5 @@
   "namedLogo": "GNU Emacs",
   "logoColor": "white",
   "label": "nightly",
-  "message": "2021-12-19.1ffb757.master"
+  "message": "2021-12-20.aa1fdb3.master"
 }