diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
index df69a59f6c39..a40e941fa9b2 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
@@ -9,10 +9,10 @@
 
 buildMozillaMach rec {
   pname = "firefox";
-  version = "139.0";
+  version = "139.0.1";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "84a2b47f2ff71aac226a774ab0ac9ab8d9a16f5620a06f7abb6648732209d022aef35a9d4873e91ebd67a4fc494fc238524e25c38fad8046db26afda06e6f970";
+    sha512 = "78ae10fc14900eb1273b7ff798a159504f68166c39b1f12ef9ea04243debc78472c24499da01641590feb5d2b28475131d2ec94d6f28fd4f2f644a721f7f40ba";
   };
 
   meta = {