diff --git a/pkgs/applications/networking/mailreaders/thunderbird/default.nix b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
index 447c4b3f3b5..046e83e493c 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 = "78.9.0";
+  version = "78.9.1";
 
   src = fetchurl {
     url =
       "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
     sha512 =
-      "35n9l1kjx52davwf1k5gdx2y81hws3mfb5755464z9db48n0vfj756jlg9d8f2m2s29js27bdswl64mralw4j085dl11661g7p9ypzs";
+      "3370ngycp6syvxfnindzz06xg39vb2knfi2zshsm87aqrapk52vmfbdagv5a85vwlmd2h5gd47zcmz2mj5360mcfxlc380hrqks69zs";
   };
 
   nativeBuildInputs = [