diff --git a/pkgs/by-name/sm/smtp4dev/package.nix b/pkgs/by-name/sm/smtp4dev/package.nix
index 8d397f268941..9bf28dcf869e 100644
--- a/pkgs/by-name/sm/smtp4dev/package.nix
+++ b/pkgs/by-name/sm/smtp4dev/package.nix
@@ -7,7 +7,6 @@
   npmHooks,
   fetchNpmDeps,
   dotnetCorePackages,
-  nix-update-script,
 }:
 
 buildDotnetModule (finalAttrs: {
@@ -48,9 +47,7 @@ buildDotnetModule (finalAttrs: {
     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";
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