diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 8d7a44b73135..00b9f32888b2 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -96,10 +96,10 @@
 
   firefox-esr-128 = buildMozillaMach rec {
     pname = "firefox";
-    version = "128.0esr";
+    version = "128.1.0esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "b65f28a530016fd0cf46bc5f55fdec2a0cc66bd9a71b606b8d6dace1f6ce1d8744b08298549cf9c338eca1d9331dd506874ed3244bd3b856c153bd765e6071be";
+      sha512 = "8055a7f83acf0cab6124ba5809aff1c082e81a0d30ff318ec719f8fd3f4af9aa60e2094c1abd6c981193d751075a9569370176e20e50f3c1959fe27a15511388";
     };
 
     meta = {