diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 43703daf2787..297261c5eb84 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -3,10 +3,10 @@
 rec {
   firefox = buildMozillaMach rec {
     pname = "firefox";
-    version = "100.0.2";
+    version = "101.0";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "6d9922e35e496fa63833ba03d1466e075287e40e50854ddc4f4a2036d9c7ca1f35c03bc6f708a3c469e0ec3b389b3346ac754bb84df0fecb86955fc21c05e00f";
+      sha512 = "fffe7e0940c1443fcdc5b205677764cb4e04b29f33fcfafb2857d383700584f309806b81fc4989efb56cc12a3cca1ff7d451b647050c43e98777b5c952ed5d56";
     };
 
     meta = {