diff --git a/pkgs/by-name/sm/smtp4dev/package.nix b/pkgs/by-name/sm/smtp4dev/package.nix
index 6b646d67af72..7a4abeaa4a71 100644
--- a/pkgs/by-name/sm/smtp4dev/package.nix
+++ b/pkgs/by-name/sm/smtp4dev/package.nix
@@ -7,27 +7,20 @@
   npmHooks,
   fetchNpmDeps,
   dotnetCorePackages,
-  nix-update-script,
 }:
-let
+
+buildDotnetModule (finalAttrs: {
+  pname = "smtp4dev";
   version = "3.8.6";
+
   src = fetchFromGitHub {
     owner = "rnwood";
     repo = "smtp4dev";
-    tag = version;
+    tag = finalAttrs.version;
     hash = "sha256-k4nerh4cVVcFQF7a4Wvcfhefa3SstEOASk+0soN0n9k=";
   };
-  npmRoot = "Rnwood.Smtp4dev/ClientApp";
+
   patches = [ ./smtp4dev-npm-packages.patch ];
-in
-buildDotnetModule {
-  inherit
-    version
-    src
-    npmRoot
-    patches
-    ;
-  pname = "smtp4dev";
 
   nativeBuildInputs = [
     nodejs
@@ -36,10 +29,12 @@ buildDotnetModule {
     stdenv.cc # c compiler is needed for compiling npm-deps
   ];
 
+  npmRoot = "Rnwood.Smtp4dev/ClientApp";
+
   npmDeps = fetchNpmDeps {
-    inherit src patches;
+    inherit (finalAttrs) src patches;
     hash = "sha256-Uj0EnnsA+QHq5KHF2B93OG8rwxYrV6sEgMTbd43ttCA=";
-    postPatch = "cd ${npmRoot}";
+    postPatch = "cd ${finalAttrs.npmRoot}";
   };
 
   dotnet-sdk = dotnetCorePackages.sdk_8_0;
@@ -52,9 +47,7 @@ buildDotnetModule {
     mv $out/bin/Rnwood.Smtp4dev $out/bin/smtp4dev
   '';
 
-  passthru.updateScript = nix-update-script {
-    extraArgs = [ "--version-regex=^(\\d+\\.\\d+\\.\\d+)$" ];
-  };
+  passthru.updateScript = ./update.sh;
 
   meta = {
     description = "Fake smtp email server for development and testing";
@@ -64,7 +57,8 @@ buildDotnetModule {
     maintainers = with lib.maintainers; [
       rucadi
       jchw
+      defelo
     ];
     platforms = lib.platforms.unix;
   };
-}
+})
diff --git a/pkgs/by-name/sm/smtp4dev/update.sh b/pkgs/by-name/sm/smtp4dev/update.sh
new file mode 100755
index 000000000000..3f673377909c
--- /dev/null
+++ b/pkgs/by-name/sm/smtp4dev/update.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq nix-update
+
+version=$(curl ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} -sfL "https://api.github.com/repos/rnwood/smtp4dev/releases/latest" | jq -r .tag_name)
+nix-update --version="$version" smtp4dev