diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 297261c5eb84..9e50bdae1738 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -28,11 +28,11 @@ rec {
 
   firefox-esr-91 = buildMozillaMach rec {
     pname = "firefox-esr";
-    version = "91.9.1esr";
+    version = "91.10.0esr";
     applicationName = "Mozilla Firefox ESR";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "d432d559f2c5f4b0bc66a755db7d61585e24a727cd8d18630854b3fb8633d54baf61ed65b580345b13d52b66288aa15ca8ca5cfcde8231e88108241f0b007683";
+      sha512 = "8344b829d7bd86250afdd4cb582e27ed5705b3ef48aec50b9a39abc17deba86c9fd721f4667f5c2155e3d7cd1d6e1f82ff8e218ced3a16a4e06bb414ee0690f8";
     };
 
     meta = {