diff --git a/pkgs/applications/editors/vscode/extensions/ms-dotnettools.csharp/default.nix b/pkgs/applications/editors/vscode/extensions/ms-dotnettools.csharp/default.nix
index 7d6318ca2093..9f53c83a95d2 100644
--- a/pkgs/applications/editors/vscode/extensions/ms-dotnettools.csharp/default.nix
+++ b/pkgs/applications/editors/vscode/extensions/ms-dotnettools.csharp/default.nix
@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  fetchzip,
   vscode-utils,
   autoPatchelfHook,
   icu,
@@ -17,29 +18,41 @@ let
     {
       x86_64-linux = {
         arch = "linux-x64";
-        hash = "sha256-PlA1uuudUPnKCas5brviS8ZMDweFEdti6N5fu8XCzvY=";
+        hash = "sha256-FPhB2oWx5x/qr2k4sAg8w2Wx+LvW/Syfc/u8nnTCQFU=";
       };
       aarch64-linux = {
         arch = "linux-arm64";
-        hash = "sha256-DyOT9AZAdW48G7SZfiFdveY9JwZDZjtT4Mp/LYY2JRk=";
+        hash = "sha256-qVZ9Go+/mVIoUr8Qt/kJv8gvOWd7NLu1wk7YZ2v6Lw8=";
       };
       x86_64-darwin = {
         arch = "darwin-x64";
-        hash = "sha256-vew5YkrX7soPNiYO+KX5Uy2HOiJ701YWWZULtH5Aq+I=";
+        hash = "sha256-7G9t84clyi4T3k7FxoPIfaIs4VabBTvGilTptd3AHOw=";
       };
       aarch64-darwin = {
         arch = "darwin-arm64";
-        hash = "sha256-rc6KVNZWNJYt8RkbqyPB4Q7aJB6jtlWMsd4UHGbqsoI=";
+        hash = "sha256-fmWlcLVUUY6Ekx5mtsBYFrYFdXpSUg8PctDBUovETV4=";
       };
     }
     .${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}")
   );
+
+  # Get url from runtimeDependencies in package.json
+  # TODO: Automate fetching runtimeDependencies from package.json
+  #       ideally should be done at the vscode-extensions level for
+  #       everyone to reuse.
+  roslyn-copilot = fetchzip {
+    url = "https://roslyn.blob.core.windows.net/releases/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer-18.0.479-alpha.zip";
+    hash = "sha256-xq66gY3N3/R9bG6XWqLy53T/ExzGdZi3ZBNEzYAeqM8=";
+    postFetch = ''
+      touch install.Lock
+    '';
+  };
 in
 vscode-utils.buildVscodeMarketplaceExtension {
   mktplcRef = {
     name = "csharp";
     publisher = "ms-dotnettools";
-    version = "2.87.31";
+    version = "2.89.19";
     inherit (extInfo) hash arch;
   };
 
@@ -62,6 +75,10 @@ vscode-utils.buildVscodeMarketplaceExtension {
       --replace-fail 'uname -m' '${lib.getExe' coreutils "uname"} -m'
   '';
 
+  postInstall = ''
+    ln -s ${roslyn-copilot} "$out"/share/vscode/extensions/ms-dotnettools.csharp/.roslynCopilot
+  '';
+
   preFixup = ''
     (
       set -euo pipefail