Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: fastmail-desktop 0 -> 1
attrpath: fastmail-desktop
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/4y2waa85s938lhw2jzx66f5mlzr60b7m-packages.json.drv
building '/nix/store/4y2waa85s938lhw2jzx66f5mlzr60b7m-packages.json.drv'...

Going to be running update for following packages:
 - fastmail-desktop-1.1.0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - fastmail-desktop-1.1.0: UPDATING ...
 - fastmail-desktop-1.1.0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/fa/fastmail-desktop/sources.nix b/pkgs/by-name/fa/fastmail-desktop/sources.nix
index 8cd885bf99e0..180f077640e2 100644
--- a/pkgs/by-name/fa/fastmail-desktop/sources.nix
+++ b/pkgs/by-name/fa/fastmail-desktop/sources.nix
@@ -1,19 +1,19 @@
 # Generated by ./update.sh - do not update manually!
-# Last updated: 2026-02-26
+# Last updated: 2026-04-07
 { fetchurl, fetchzip }:
 {
   aarch64-darwin = {
-    version = "1.1.0";
+    version = "1.2.1";
     src = fetchurl {
-      url = "https://dl.fastmailcdn.com/desktop/production/mac/arm64/Fastmail-1.1.0-arm64-mac.zip";
-      hash = "sha512-z1iW4DnPKY3b1SnIvmgsA62unqMR8nLJpql0jbMuHxyAxWntAZZjpxY0GhmwmZl/WjaCn2SeXj0iYlTJTecZjQ==";
+      url = "https://dl.fastmailcdn.com/desktop/production/mac/arm64/Fastmail-1.2.1-arm64-mac.zip";
+      hash = "sha512-bu6IeL8X8ogD1qSlAuApWTBTCYIk5QrjWrzjOv8fel+kqYfCIcDXP1DP1FdJwULe91zoZn4M/uDX8CoOPWa0cA==";
     };
   };
   x86_64-linux = {
-    version = "1.1.0";
+    version = "1.2.1";
     src = fetchurl {
-      url = "https://dl.fastmailcdn.com/desktop/production/linux/x64/Fastmail-1.1.0.AppImage";
-      hash = "sha512-lXvgZ61M1Ex7jJzFjfC9rYLodGojrbca/t4IOaQ7k/CDI4DyFRDkAGqkGioq7EwzbooS9zTO3fbdYmbOyODFTQ==";
+      url = "https://dl.fastmailcdn.com/desktop/production/linux/x64/com.fastmail.Fastmail-1.2.1.AppImage";
+      hash = "sha512-xudOPNjOaumYxD7yZyjQnYhuiKqDO10cBwMdFJtVEOfHVia0jJMgdUTJx03otIBn9ijM3/1Qo6wsq1HF0A/zlQ==";
     };
   };
 }

An auto update branch exists with message `fastmail-desktop: 1.0.7 -> 1.0.8`. New version is 1.2.1.
The auto update branch does not match or exceed the new version.
There might already be an open PR for this update:
- fastmail-desktop: 1.1.0 -> 1.2.1
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/503002"