diff --git a/pkgs/applications/networking/mailreaders/thunderbird/default.nix b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
index 34aac296523..b7d00890fb7 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
@@ -69,13 +69,13 @@ assert waylandSupport -> gtk3Support == true;
 
 stdenv.mkDerivation rec {
   pname = "thunderbird";
-  version = "78.2.0";
+  version = "78.2.1";
 
   src = fetchurl {
     url =
       "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
     sha512 =
-      "2mcd2ywa8kgz3gcah5acpw7wwc194plwca9f09l18ibml64mxbdk6ilmp8cbq2mgkap99brdz923apslf9y4fdlcw64g2s4m8xdy3mj";
+      "2iya9a5qaini524wrdrnxx6wsrgb8fa2b1m42mlypskxjjgb7n66vpxlbpi9x9mqzc63ca2ag36fjpbpsvbv5ppxvpfwk2j1zbfvb5w";
   };
 
   nativeBuildInputs = [