diff --git a/antd-php/src/AntdClient.php b/antd-php/src/AntdClient.php
index 3bde6ed..ecd79a3 100644
--- a/antd-php/src/AntdClient.php
+++ b/antd-php/src/AntdClient.php
@@ -182,11 +182,7 @@ function (\Throwable $e) {
      */
     public function health(): HealthStatus
     {
-        $json = $this->doJson('GET', '/health');
-        return new HealthStatus(
-            ok: ($json['status'] ?? '') === 'ok',
-            network: $json['network'] ?? '',
-        );
+        return self::healthStatusFromJson($this->doJson('GET', '/health'));
     }
 
     /**
@@ -197,10 +193,28 @@ public function health(): HealthStatus
     public function healthAsync(): PromiseInterface
     {
         return $this->doJsonAsync('GET', '/health')->then(
-            fn(?array $json) => new HealthStatus(
-                ok: ($json['status'] ?? '') === 'ok',
-                network: $json['network'] ?? '',
-            ),
+            fn(?array $json) => self::healthStatusFromJson($json),
+        );
+    }
+
+    /**
+     * Convert a /health JSON response to a typed HealthStatus. Diagnostic
+     * fields default to '' / 0 when talking to a pre-0.4.0 daemon.
+     *
+     * @param array<string, mixed>|null $json
+     */
+    private static function healthStatusFromJson(?array $json): HealthStatus
+    {
+        $json ??= [];
+        return new HealthStatus(
+            ok: ($json['status'] ?? '') === 'ok',
+            network: $json['network'] ?? '',
+            version: $json['version'] ?? '',
+            evmNetwork: $json['evm_network'] ?? '',
+            uptimeSeconds: (int)($json['uptime_seconds'] ?? 0),
+            buildCommit: $json['build_commit'] ?? '',
+            paymentTokenAddress: $json['payment_token_address'] ?? '',
+            paymentVaultAddress: $json['payment_vault_address'] ?? '',
         );
     }
 
diff --git a/antd-php/src/Models/HealthStatus.php b/antd-php/src/Models/HealthStatus.php
index 8f1eadb..eb55e57 100644
--- a/antd-php/src/Models/HealthStatus.php
+++ b/antd-php/src/Models/HealthStatus.php
@@ -4,10 +4,25 @@
 
 namespace Autonomi\Antd\Models;
 
+/**
+ * Health check result from the antd daemon.
+ *
+ * The diagnostic fields ({@see $version}, {@see $evmNetwork},
+ * {@see $uptimeSeconds}, {@see $buildCommit}, {@see $paymentTokenAddress},
+ * {@see $paymentVaultAddress}) were added in antd 0.4.0. They default to
+ * empty / 0 so the class stays constructable when talking to a pre-0.4.0
+ * daemon that doesn't report them.
+ */
 readonly class HealthStatus
 {
     public function __construct(
         public bool $ok,
         public string $network,
+        public string $version = '',
+        public string $evmNetwork = '',
+        public int $uptimeSeconds = 0,
+        public string $buildCommit = '',
+        public string $paymentTokenAddress = '',
+        public string $paymentVaultAddress = '',
     ) {}
 }
diff --git a/antd-php/tests/AntdClientTest.php b/antd-php/tests/AntdClientTest.php
index 9af9cfa..fd56871 100644
--- a/antd-php/tests/AntdClientTest.php
+++ b/antd-php/tests/AntdClientTest.php
@@ -37,12 +37,43 @@ private function jsonResponse(int $status, array $body): Response
     public function testHealth(): void
     {
         $mock = new MockHandler([
-            $this->jsonResponse(200, ['status' => 'ok', 'network' => 'local']),
+            $this->jsonResponse(200, [
+                'status' => 'ok',
+                'network' => 'local',
+                'version' => '0.4.0',
+                'evm_network' => 'local',
+                'uptime_seconds' => 42,
+                'build_commit' => 'abcdef123456',
+                'payment_token_address' => '0xtoken',
+                'payment_vault_address' => '0xvault',
+            ]),
         ]);
         $client = $this->createClient($mock);
         $health = $client->health();
         $this->assertTrue($health->ok);
         $this->assertSame('local', $health->network);
+        $this->assertSame('0.4.0', $health->version);
+        $this->assertSame('local', $health->evmNetwork);
+        $this->assertSame(42, $health->uptimeSeconds);
+        $this->assertSame('abcdef123456', $health->buildCommit);
+        $this->assertSame('0xtoken', $health->paymentTokenAddress);
+        $this->assertSame('0xvault', $health->paymentVaultAddress);
+    }
+
+    public function testHealthPreV0_4_0Daemon(): void
+    {
+        // Older daemons reply with just status + network; the empty defaults
+        // populate the diagnostic fields rather than throwing.
+        $mock = new MockHandler([
+            $this->jsonResponse(200, ['status' => 'ok', 'network' => 'default']),
+        ]);
+        $client = $this->createClient($mock);
+        $health = $client->health();
+        $this->assertTrue($health->ok);
+        $this->assertSame('default', $health->network);
+        $this->assertSame('', $health->version);
+        $this->assertSame('', $health->evmNetwork);
+        $this->assertSame(0, $health->uptimeSeconds);
     }
 
     // --- Data Public ---