diff --git a/pkgs/applications/networking/mailreaders/thunderbird/default.nix b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
index 026f8d41b4a..4e17cbe6b44 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
@@ -73,13 +73,13 @@ assert waylandSupport -> gtk3Support == true;
 
 stdenv.mkDerivation rec {
   pname = "thunderbird";
-  version = "78.11.0";
+  version = "78.12.0";
 
   src = fetchurl {
     url =
       "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
     sha512 =
-      "1m12kx830pfzvby8j9i5nb9c5v71vlg4wr0qrjgg3pw5ml9j5x7myrqyfd49l2qppm3xjn08srvmf45avnwq0lrys4sb83iwsd46sf6";
+      "8a9275f6a454b16215e9440d8b68926e56221dbb416f77ea0cd0a42853bdd26f35514e792564879c387271bd43d8ee966577f133f8ae7781f43e8bec9ab78696";
   };
 
   nativeBuildInputs = [