diff --git a/pkgs/by-name/ta/tartan/package.nix b/pkgs/by-name/ta/tartan/package.nix
index ba1bfcb20ee1..dbe20491888a 100644
--- a/pkgs/by-name/ta/tartan/package.nix
+++ b/pkgs/by-name/ta/tartan/package.nix
@@ -5,7 +5,7 @@
   meson,
   ninja,
   pkg-config,
-  llvmPackages,
+  llvmPackages_20,
   gobject-introspection,
   glib,
   unstableGitUpdater,
@@ -32,8 +32,9 @@ stdenv.mkDerivation {
   buildInputs = [
     gobject-introspection
     glib
-    llvmPackages.libclang
-    llvmPackages.libllvm
+    # https://gitlab.freedesktop.org/tartan/tartan/-/merge_requests/29
+    llvmPackages_20.libclang
+    llvmPackages_20.libllvm
   ];
 
   passthru = {