diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 15abc8ece172..86b36c6cfa3b 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -55,11 +55,11 @@ rec {
 
   firefox-esr-91 = buildMozillaMach rec {
     pname = "firefox-esr-91";
-    version = "91.12.0esr";
+    version = "91.13.0esr";
     applicationName = "Mozilla Firefox ESR";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "323fb752488b45872b40f0b0ee1d8c1dffa16874dbff2afde19a54286c824ef48177233e029faeafa5946184e71c31c6bc5ba7ec17a571e21af64fc5f7334042";
+      sha512 = "38b4cc52de21e76d6061e6ba175e1cbfd888a16070aa951f5a44283f2db9d7e94f2504621f0da78feac6e71491a6d0e7038f63dd0ae112dcad700eb02e9aa516";
     };
 
     meta = {