diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 6c2d05a3fd9a..02d8615c2ae1 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -64,13 +64,13 @@
 
   firefox-devedition = buildMozillaMach rec {
     pname = "firefox-devedition";
-    version = "132.0b9";
+    version = "133.0b1";
     applicationName = "Mozilla Firefox Developer Edition";
     requireSigning = false;
     branding = "browser/branding/aurora";
     src = fetchurl {
       url = "mirror://mozilla/devedition/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "3393bb677c6e735860ef49c837ffab10720c6eb47d6cfb6c7960267e3676c69c8293b5f7e49de3f91b6eb88fa4780300db2b2653dde1ae38d546f473bca7e34b";
+      sha512 = "dced4aba71b07b68ee31c283945e7d62a7032f08f5cf71aa261fc7ba32f58277acbe9fdbdd28777d7f4b824e411815b069cab0ce791438088c9ad19c3d2de62e";
     };
 
     meta = {