diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-devedition.nix
index c65b04e5ac36..2c74b044c326 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 = "firefox-devedition";
-  version = "145.0b9";
+  version = "146.0b9";
   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 = "36000021b8f30eb5e80ce3b2e4ae05499e8b8cbdec93ba97dfb9c8f107cbe80202a13c4923491c01c8c245fc1810bb6fc82a46a06817ab7e70a47c04385b306e";
+    sha512 = "6fac88325150620388f49ffe1ba0385216184b98e0faa54e01804292563798a032a8cef375dbc78a41b9ba3e18d1e9258aca5e090bc827f2e7e842f76ee34c25";
   };
 
   # buildMozillaMach sets MOZ_APP_REMOTINGNAME during configuration, but