diff --git a/flake.nix b/flake.nix
index fdbfd62..799fc62 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,8 +16,25 @@
   in
   {
     packages.${system} = {
-      gpt4all-chat = pkgs.qt6Packages.callPackage ./gpt4all-chat.nix { src=gpt4all; };
-      gpt4all-chat-avx = pkgs.qt6Packages.callPackage ./gpt4all-chat.nix { src=gpt4all; withAvx2 = false; };
+      gpt4all-chat-2_5_4 = 
+      let
+        version = "2.5.4";
+      in
+      pkgs.qt6Packages.callPackage ./gpt4all-chat.nix {
+        src = pkgs.fetchFromGitHub {
+          owner = "nomic-ai";
+          repo = "gpt4all";
+          rev = "v${version}";
+          fetchSubmodules = true;
+          sha256 = "sha256-JZ8O9a0XRwRR81b+A97sWOtiL0M12cqLh9eoE+VkDVg=";
+        };
+        inherit version;
+      };
+      gpt4all-chat-avx-2_5_4 = self.packages.${system}.gpt4all-chat-2_5_4.override { withAvx2 = false; };
+      gpt4all-chat-nightly = pkgs.qt6Packages.callPackage ./gpt4all-chat.nix { src=gpt4all; };
+      gpt4all-chat-avx-nightly = self.packages.${system}.gpt4all-chat-nightly.override { withAvx2 = false; };
+      gpt4all-chat = self.packages.${system}.gpt4all-chat-2_5_4;
+      gpt4all-chat-avx = self.packages.${system}.gpt4all-chat-avx-2_5_4;
       default = self.packages.${system}.gpt4all-chat;
     };
 
diff --git a/gpt4all-chat.nix b/gpt4all-chat.nix
index 401d460..7a0d18c 100644
--- a/gpt4all-chat.nix
+++ b/gpt4all-chat.nix
@@ -13,14 +13,15 @@
 , vulkan-headers
 , wayland
 , wrapQtAppsHook
+, version ? "nightly"
 , withAvx2 ? true
 }:
 
 stdenv.mkDerivation {
   pname = "gpt4all-chat";
-  version = "nightly";
 
   inherit src;
+  inherit version;
 
   postPatch = ''
     substituteInPlace CMakeLists.txt \