diff --git a/pkgs/misc/vscode-extensions/default.nix b/pkgs/misc/vscode-extensions/default.nix
index 37a0a0c0f5fb..704a6554b9cb 100644
--- a/pkgs/misc/vscode-extensions/default.nix
+++ b/pkgs/misc/vscode-extensions/default.nix
@@ -924,8 +924,8 @@ let
         mktplcRef = {
           name = "language-haskell";
           publisher = "justusadam";
-          version = "3.2.1";
-          sha256 = "0lxp8xz17ciy93nj4lzxqvz71vw1zdyamrnh2n792yair8890rr6";
+          version = "3.4.0";
+          sha256 = "0ab7m5jzxakjxaiwmg0jcck53vnn183589bbxh3iiylkpicrv67y";
         };
         meta = {
           license = lib.licenses.bsd3;