diff --git a/pkgs/applications/networking/mailreaders/thunderbird/packages.nix b/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
index b99d5dedd4b..46191b2b318 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/packages.nix
@@ -10,12 +10,12 @@ in
 rec {
   thunderbird = (common rec {
     pname = "thunderbird";
-    version = "91.8.1";
+    version = "91.9.0";
     application = "comm/mail";
     binaryName = pname;
     src = fetchurl {
       url = "mirror://mozilla/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.xz";
-      sha512 = "1591f3e9c76c1f2ea7fa5e194a7d030c8657a7855a95c8a177e8067c5aa838f0d8ca2652cd049b4bc88d0c9e604285a47b0c8316c190e2ceadfc1130d1e4de6c";
+      sha512 = "474b5aca9c5e54fdc72eebff938f0d217bc039c3ac8d1caf965fb61bd1cf349f389a1df751a525de567a1eeabd7bb1bf2246014e84c7aab89edce059fe2e72d1";
     };
     extraPatches = [
       # The file to be patched is different from firefox's `no-buildconfig-ffx90.patch`.