diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
index 9dfc70f6151f..8397223f78b5 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
@@ -9,10 +9,10 @@
 
 buildMozillaMach rec {
   pname = "firefox";
-  version = "136.0.2";
+  version = "136.0.3";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "50dfbedb6bd513a3c6cf90558d7c6993cc78558cccc69fcc882f8e54eb8e8bec9779dce6fb7211c1a0234ac4a189438c5fa55ee9d0d06fcbae5cf44778af2ef1";
+    sha512 = "59cb54bc946aecea810169970aad4ba3f7b3092e56f15f86ff3d51fa2752c89632a057a1bda016f0005665ec5099d9b9f9a4786b9c02e3f5656eb2003b6a1747";
   };
 
   meta = {