diff --git a/doc/release-notes/rl-2511.section.md b/doc/release-notes/rl-2511.section.md
index 2a9912f269fc..9f0efa3e7b57 100644
--- a/doc/release-notes/rl-2511.section.md
+++ b/doc/release-notes/rl-2511.section.md
@@ -287,6 +287,8 @@
   Use `python3Packages.ddgs` instead.
   See [release note for v9.0.0](https://github.com/deedy5/ddgs/releases/tag/v9.0.0)
 
+- `ra-multiplex` has been renamed to/replaced by `lspmux`. Its wrapper no longer includes `rust-analyzer`.
+
 ## Other Notable Changes {#sec-nixpkgs-release-25.11-notable-changes}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
diff --git a/pkgs/by-name/ls/lspmux/package.nix b/pkgs/by-name/ls/lspmux/package.nix
new file mode 100644
index 000000000000..deeb333f59f3
--- /dev/null
+++ b/pkgs/by-name/ls/lspmux/package.nix
@@ -0,0 +1,28 @@
+{
+  lib,
+  fetchFromGitea,
+  rustPlatform,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "lspmux";
+  version = "0.3.0";
+
+  src = fetchFromGitea {
+    domain = "codeberg.org";
+    owner = "p2502";
+    repo = "lspmux";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-WNmejKA1wXbu7+cwxBu1tv0kUunt1LAcGP48fWon/b4=";
+  };
+
+  cargoHash = "sha256-Um4BZ1QTHCilOslo/GR7cGvPCX1xNitf6WU8QaehAaE=";
+
+  meta = with lib; {
+    description = "Share one language server instance between multiple LSP clients to save resources";
+    mainProgram = "lspmux";
+    homepage = "https://codeberg.org/p2502/lspmux";
+    license = with licenses; [ eupl12 ];
+    maintainers = with maintainers; [ mrcjkb ];
+  };
+})
diff --git a/pkgs/by-name/ra/ra-multiplex/package.nix b/pkgs/by-name/ra/ra-multiplex/package.nix
deleted file mode 100644
index 5024c50e43c3..000000000000
--- a/pkgs/by-name/ra/ra-multiplex/package.nix
+++ /dev/null
@@ -1,36 +0,0 @@
-{
-  lib,
-  fetchFromGitHub,
-  makeWrapper,
-  rustPlatform,
-  rust-analyzer,
-}:
-
-rustPlatform.buildRustPackage rec {
-  pname = "ra-multiplex";
-  version = "0.2.5";
-
-  src = fetchFromGitHub {
-    owner = "pr2502";
-    repo = "ra-multiplex";
-    rev = "v${version}";
-    hash = "sha256-aBrn9g+MGXLAsOmHqw1Tt6NPFGJTyYv/L9UI/vQU4i8=";
-  };
-
-  cargoHash = "sha256-NVE/ROk6x1R0D5eyOzz1gYPvgG0lX5L2tCuZGIS9kzs=";
-
-  nativeBuildInputs = [ makeWrapper ];
-
-  postInstall = ''
-    wrapProgram $out/bin/ra-multiplex \
-      --suffix PATH : ${lib.makeBinPath [ rust-analyzer ]}
-  '';
-
-  meta = with lib; {
-    description = "Multiplexer for rust-analyzer";
-    mainProgram = "ra-multiplex";
-    homepage = "https://github.com/pr2502/ra-multiplex";
-    license = with licenses; [ mit ];
-    maintainers = with maintainers; [ norfair ];
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 645d34baada4..af692a2e3ce1 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1332,6 +1332,7 @@ mapAliases {
   quicksynergy = throw "'quicksynergy' has been removed due to lack of maintenance upstream. Consider using 'deskflow' instead."; # Added 2025-06-18
   quorum = throw "'quorum' has been removed as it was broken and unmaintained upstream"; # Added 2025-11-07
   qv2ray = throw "'qv2ray' has been removed as it was unmaintained"; # Added 2025-06-03
+  ra-multiplex = lib.warnOnInstantiate "'ra-multiplex' has been renamed to/replaced by 'lspmux'" lspmux; # Added 2025-10-27
   radicale3 = throw "'radicale3' has been renamed to/replaced by 'radicale'"; # Converted to throw 2025-10-27
   railway-travel = throw "'railway-travel' has been renamed to/replaced by 'diebahn'"; # Converted to throw 2025-10-27
   rambox-pro = throw "'rambox-pro' has been renamed to/replaced by 'rambox'"; # Converted to throw 2025-10-27