diff --git a/pkgs/applications/networking/mailreaders/thunderbird/packages.nix b/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
index f90350586c8d..1e968220efee 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
@@ -43,13 +43,13 @@ rec {
 
   thunderbird-115 = (buildMozillaMach rec {
     pname = "thunderbird";
-    version = "115.2.3";
+    version = "115.3.0";
     application = "comm/mail";
     applicationName = "Mozilla Thunderbird";
     binaryName = pname;
     src = fetchurl {
       url = "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
-      sha512 = "983547b2be67ffbe7727efa50bd925f576ec19bcfcf940d5d36def19aebea27494b3af0a37756a441b544ebbca0cf546fcaf8737e76a859b4d860c8294bba1dc";
+      sha512 = "a6fd99f9eccea5cfc8a6236a1651444fae9db99efd0ae667366638f664513e70529c63e2947b53433c1013517b23f3561cffada81d1181bd9359a02d3e059503";
     };
     extraPatches = [
       # The file to be patched is different from firefox's `no-buildconfig-ffx90.patch`.