diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
index c7e29fc1677f..e93b0cfff180 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
@@ -10,13 +10,13 @@
 buildMozillaMach rec {
   pname = "firefox-devedition";
   binaryName = pname;
-  version = "141.0b9";
+  version = "142.0b3";
   applicationName = "Firefox Developer Edition";
   requireSigning = false;
   branding = "browser/branding/aurora";
   src = fetchurl {
     url = "mirror://mozilla/devedition/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "0acb95c53c35d086aa777a96563e5cdc2838b8fedceeba344a2d4f5c9b0cbd148e8d1313463c35cf98fb52048bebd1b7a3aefc63e0d3ac9ae66de69fa25fc2e8";
+    sha512 = "5752c77307e59ad188385bb7bbb440e01a256f437088e051d1bc74e0ccdbde4ddf68c97fdcf0401c03636293753c5e8f7132352aed5f5e9e537c96eaf8784f21";
   };
 
   # buildMozillaMach sets MOZ_APP_REMOTINGNAME during configuration, but