diff --git a/config/Ollama.nix b/config/Ollama.nix
index 3dff178..edac282 100644
--- a/config/Ollama.nix
+++ b/config/Ollama.nix
@@ -1,7 +1,7 @@
 {
-  pkgsUnstable,
-  lib,
   config,
+  lib,
+  pkgsUnstable,
   ...
 }:
 let
@@ -9,40 +9,12 @@ let
 in
 {
   config = lib.mkIf cfg.enable {
-    # Specify default model.
-    environment.variables.OLLAMA_MODEL = cfg.primaryModel;
-
-    systemd.services = {
-      # Enable Ollama server.
-      ollama = {
-        description = "Ollama LLM server";
-        wantedBy = [ "multi-user.target" ];
-        serviceConfig = {
-          Type = "simple";
-        };
-        script = ''
-          HOME=/root ${lib.getExe pkgsUnstable.ollama} serve
-        '';
-      };
-
-      # Download Ollama models.
-      ollama-pull = {
-        description = "Ollama LLM model";
-        wantedBy = [ "multi-user.target" ];
-        serviceConfig.Type = "simple";
-        after = [
-          "NetworkManager-wait-online.service"
-          "ollama.service"
-        ];
-        wants = [
-          "NetworkManager-wait-online.service"
-          "ollama.service"
-        ];
-        script = ''
-          sleep 5
-          HOME=/root ${lib.getExe pkgsUnstable.ollama} pull ${lib.concatStringsSep " " cfg.models}
-        '';
-      };
+    services.ollama = {
+      enable = true;
+      host = "[::1]";
+      loadModels = cfg.models;
+      package = pkgsUnstable.ollama;
+      # acceleration = false;
     };
   };
 }
diff --git a/option/Ollama.nix b/option/Ollama.nix
index 89e2277..bda3b66 100644
--- a/option/Ollama.nix
+++ b/option/Ollama.nix
@@ -13,8 +13,9 @@ in
       default = [ cfg.primaryModel ];
       type = with lib.types; listOf str;
     };
+    # REF: https://ollama.com/library
     primaryModel = lib.mkOption {
-      default = "llama3.2";
+      default = "deepseek-r1";
       type = lib.types.str;
     };
   };