diff --git a/pkgs/applications/networking/mailreaders/thunderbird/default.nix b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
index fa68ef83a085..4abedec52318 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
@@ -70,13 +70,13 @@ assert waylandSupport -> gtk3Support == true;
 
 stdenv.mkDerivation rec {
   pname = "thunderbird";
-  version = "78.3.0";
+  version = "78.3.1";
 
   src = fetchurl {
     url =
       "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
     sha512 =
-      "2jxwx7yli1f032bdz1d8gd724am8kjxla7d767p0dl1zcw761xnimhl41m4ik7cc9dhj8s6wfhjgrga70794c2dfd7c36dlhgjqp9mx";
+      "16b05e51776ba16503bc5fba02a6d0b5050a206e264a4707544354ad76af61902fd2dcf5d97b82b432dc69362ccd18543a0acccd80e06648e6c6f470886da450";
   };
 
   nativeBuildInputs = [