diff --git a/pkgs/by-name/st/stylelint-lsp/package.nix b/pkgs/by-name/st/stylelint-lsp/package.nix
index b78025195b8d..0749b80460e4 100644
--- a/pkgs/by-name/st/stylelint-lsp/package.nix
+++ b/pkgs/by-name/st/stylelint-lsp/package.nix
@@ -1,48 +1,44 @@
 {
   fetchFromGitHub,
   lib,
-  nodejs,
-  pnpm_9,
+  nodejs-slim,
+  pnpm_11,
   fetchPnpmDeps,
   pnpmConfigHook,
+  pnpmBuildHook,
   stdenvNoCC,
   nix-update-script,
+  runCommand,
+  stylelint-lsp,
 }:
+let
+  pnpm = pnpm_11;
+in
 stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "stylelint-lsp";
-  version = "2.0.1";
+  version = "2.0.1-unstable-2026-07-19";
 
   src = fetchFromGitHub {
     owner = "bmatcuk";
     repo = "stylelint-lsp";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-LUX/H7yY8Dl44vgpf7vOgtMdY7h//m5BAfrK5RRH9DM=";
+    rev = "0362a26ffaf1879b9ec02e2a52a11792a2d4f8d4";
+    hash = "sha256-qRc67tvgncERh6FDJdydN6aL/a5bVSsQQir3KPp1cFk=";
   };
 
-  buildInputs = [
-    nodejs
-  ];
-
   nativeBuildInputs = [
+    nodejs-slim
     pnpmConfigHook
-    pnpm_9
+    pnpmBuildHook
+    pnpm
   ];
 
   pnpmDeps = fetchPnpmDeps {
     inherit (finalAttrs) pname version src;
-    pnpm = pnpm_9;
-    fetcherVersion = 3;
-    hash = "sha256-qzUvA00ujnIibQAONOPlp5BsXcwQb/gQvOPp83hMT5A=";
+    inherit pnpm;
+    fetcherVersion = 4;
+    hash = "sha256-EuCvuErydwe2LGG62VHcZtN/51Gv1uhhBN3/sEiqzME=";
   };
 
-  buildPhase = ''
-    runHook preBuild
-
-    pnpm build
-
-    runHook postBuild
-  '';
-
   preInstall = ''
     # remove unnecessary files
     CI=true pnpm --ignore-scripts prune --prod
@@ -57,13 +53,34 @@ stdenvNoCC.mkDerivation (finalAttrs: {
 
     mkdir -p $out/{bin,lib/stylelint-lsp}
     mv {dist,node_modules} $out/lib/stylelint-lsp
+
     chmod a+x $out/lib/stylelint-lsp/dist/index.js
+    patchShebangs $out/lib/stylelint-lsp/dist/index.js
     ln -s $out/lib/stylelint-lsp/dist/index.js $out/bin/stylelint-lsp
 
     runHook postInstall
   '';
 
-  passthru.updateScript = nix-update-script { };
+  passthru = {
+    updateScript = nix-update-script {
+      extraArgs = [ "--version=branch" ];
+    };
+
+    tests.smoke = runCommand "stylelint-lsp-smoke-test" { } ''
+      INIT_REQUEST='{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"processId":null,"rootUri":"file:///tmp","workspaceFolders":[{"uri":"file:///tmp","name":"test"}],"capabilities":{}}}'
+      CONTENT_LENGTH=''${#INIT_REQUEST}
+
+      RESPONSE=$(
+        {
+          printf "Content-Length: %d\r\n\r\n%s" "$CONTENT_LENGTH" "$INIT_REQUEST"
+          sleep 1
+        } | timeout 3  ${lib.getExe stylelint-lsp} --stdio 2>&1 | head -c 1000
+      ) || true
+
+      echo "$RESPONSE" | grep -q '"capabilities"'
+      touch $out
+    '';
+  };
 
   meta = {
     description = "Stylelint Language Server";