diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 7a3fc9b9a07..9629c590122 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -7,10 +7,10 @@ in
 rec {
   firefox = common rec {
     pname = "firefox";
-    ffversion = "87.0";
+    ffversion = "88.0";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "c1c08be2283e7a162c8be2f2647ec2bb85cab592738dc45e4b4ffb72969229cc0019a30782a4cb27f09a13b088c63841071dd202b3543dfba295140a7d6246a4";
+      sha512 = "f58f44f2f0d0f54eae5ab4fa439205feb8b9209b1bf2ea2ae0c9691e9e583bae2cbd4033edb5bdf4e37eda5b95fca688499bed000fe26ced8ff4bbc49347ce31";
     };
 
     meta = {
@@ -32,10 +32,10 @@ rec {
 
   firefox-esr-78 = common rec {
     pname = "firefox-esr";
-    ffversion = "78.9.0esr";
+    ffversion = "78.10.0esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "28582fc0a03fb50c0a817deb1083817bb7f2f5d38e98439bf655ed4ee18c83568b3002a59ef76edf357bfb11f55832a221d14130f116aac19d850768fba3ac8b";
+      sha512 = "5e2cf137dc781855542c29df6152fa74ba749801640ade3cf01487ce993786b87a4f603d25c0af9323e67c7e15c75655523428c1c1426527b8623c7ded9f5946";
     };
 
     meta = {