diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 7b3e16557d75..7283a54bc3ff 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";
-    version = "99.0.1";
+    version = "100.0";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "0006b773ef1057a6e0b959d4f39849ad4a79272b38d565da98062b9aaf0effd2b729349c1f9fa10fccf7d2462d2c536b02c167ae6ad4556d6e519c6d22c25a7f";
+      sha512 = "29c56391c980209ff94c02a9aba18fe27bea188bdcbcf7fe0c0f27f61e823f4507a3ec343b27cb5285cf3901843e9cc4aca8e568beb623c4b69b7282e662b2aa";
     };
 
     meta = {