diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
index 6864ad465b89..a1037c52818f 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
@@ -10,11 +10,11 @@
 buildMozillaMach rec {
   pname = "firefox-beta";
   binaryName = "firefox-beta";
-  version = "150.0b9";
+  version = "151.0b9";
   applicationName = "Firefox Beta";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "5afa7b27ee38e809717ca02fede9aa5ebe27f9aeb78d7953e7b0790e30edb663bf0053335e42e258b7bf01b8859e6b0a10c23851cf8b495217f954ac41a386d4";
+    sha512 = "2d50cbe82dd470ab94148ab57585324ff98950fa25b806065b61ab2f541c795d826f4d9a454225ec798cdcd77dfd453dc50d26f0ccf8bdb5fcdf010244aec45a";
   };
 
   meta = {