diff --git a/pkgs/by-name/bu/butterfly/package.nix b/pkgs/by-name/bu/butterfly/package.nix
index b8a87e17654c..7407c72586a8 100644
--- a/pkgs/by-name/bu/butterfly/package.nix
+++ b/pkgs/by-name/bu/butterfly/package.nix
@@ -2,6 +2,11 @@
   lib,
   fetchFromGitHub,
   flutter327,
+  runCommand,
+  butterfly,
+  yq,
+  _experimental-update-script-combinators,
+  gitUpdater,
 }:
 flutter327.buildFlutterApplication rec {
   pname = "butterfly";
@@ -37,7 +42,21 @@ flutter327.buildFlutterApplication rec {
     cp -r linux/debian/usr/share $out/share
   '';
 
-  passthru.updateScript = ./update.sh;
+  passthru = {
+    pubspecSource =
+      runCommand "pubspec.lock.json"
+        {
+          buildInputs = [ yq ];
+          inherit (butterfly) src;
+        }
+        ''
+          cat $src/app/pubspec.lock | yq > $out
+        '';
+    updateScript = _experimental-update-script-combinators.sequence [
+      (gitUpdater { rev-prefix = "v"; })
+      (_experimental-update-script-combinators.copyAttrOutputToFile "butterfly.pubspecSource" ./pubspec.lock.json)
+    ];
+  };
 
   meta = {
     description = "Powerful, minimalistic, cross-platform, opensource note-taking app";
diff --git a/pkgs/by-name/bu/butterfly/update.sh b/pkgs/by-name/bu/butterfly/update.sh
deleted file mode 100755
index 19732e0a7406..000000000000
--- a/pkgs/by-name/bu/butterfly/update.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -I nixpkgs=./. -i bash -p curl jq yq nix bash coreutils nix-update
-
-set -eou pipefail
-
-ROOT="$(dirname "$(readlink -f "$0")")"
-
-latestTag=$(curl ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} -sL https://api.github.com/repos/LinwoodDev/Butterfly/releases/latest | jq --raw-output .tag_name)
-latestVersion=$(echo "$latestTag" | sed 's/^v//')
-
-currentVersion=$(nix-instantiate --eval -E "with import ./. {}; butterfly.version or (lib.getVersion butterfly)" | tr -d '"')
-
-if [[ "$currentVersion" == "$latestVersion" ]]; then
-    echo "package is up-to-date: $currentVersion"
-    exit 0
-fi
-
-nix-update butterfly
-
-curl https://raw.githubusercontent.com/LinwoodDev/Butterfly/${latestTag}/app/pubspec.lock | yq . >$ROOT/pubspec.lock.json