diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8426257..bceb863 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Fix empty payload serialization.
 
+### Deprecated
+
+* Deprecate `Config::$version`, will be removed in `0.5.0`.
+
 ## [0.3.0] 2025-10-23
 
 ### Added
diff --git a/composer.json b/composer.json
index cbd1894..f310bf9 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
         "amphp/socket": "^2.3.1",
         "cuyz/valinor": "^1.15 || ^2.3",
         "revolt/event-loop": "^1.0.7",
+        "thesis/package-version": "^0.1.2",
         "thesis/time-span": "^0.2.3"
     },
     "require-dev": {
diff --git a/src/Config.php b/src/Config.php
index e8f50c1..fada1f2 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -17,7 +17,10 @@
     private const int DEFAULT_MAX_PINGS = 5;
     private const string DEFAULT_CLIENT_NAME = 'thesis/nats';
 
-    /** @var non-empty-string */
+    /**
+     * @var non-empty-string
+     * @deprecated will be removed in 0.5.0
+     */
     public string $version;
 
     /**
@@ -52,7 +55,7 @@ public function __construct(
         public ?string $jetStreamDomain = null,
         public string $clientName = self::DEFAULT_CLIENT_NAME,
     ) {
-        $this->version = '0.1.x'; // TODO: replace with actual version.
+        $this->version = '0.1.x';
     }
 
     public static function default(): self
diff --git a/src/Internal/Connection/SocketConnection.php b/src/Internal/Connection/SocketConnection.php
index 4cb7363..16d9b14 100644
--- a/src/Internal/Connection/SocketConnection.php
+++ b/src/Internal/Connection/SocketConnection.php
@@ -12,12 +12,15 @@
 use Thesis\Nats\Internal\Hooks;
 use Thesis\Nats\Internal\Nkey\Signer;
 use Thesis\Nats\Internal\Protocol;
+use function Thesis\Package\version;
 
 /**
  * @internal
  */
 final class SocketConnection implements Connection
 {
+    private const string PACKAGE_NAME = 'thesis/nats';
+
     private readonly Framer $framer;
 
     /** @var \SplQueue<DeferredFuture<Protocol\Frame>> */
@@ -71,7 +74,7 @@ public function startup(): void
             pedantic: $this->config->pedantic,
             tlsRequired: false,
             name: $this->config->clientName,
-            version: $this->config->version,
+            version: version(self::PACKAGE_NAME),
             user: $this->config->user,
             pass: $this->config->password,
             sig: $this->generateSignature($frame->nonce, $this->config->nkey),
diff --git a/tests/Internal/Connection/SocketConnectionJwtTest.php b/tests/Internal/Connection/SocketConnectionJwtTest.php
index 00e8d24..a65bdda 100644
--- a/tests/Internal/Connection/SocketConnectionJwtTest.php
+++ b/tests/Internal/Connection/SocketConnectionJwtTest.php
@@ -10,6 +10,7 @@
 use Thesis\Nats\Config;
 use Thesis\Nats\Internal\Nkey\Signer;
 use Thesis\Nats\Internal\Protocol\Connect;
+use function Thesis\Package\version;
 
 #[CoversClass(Connect::class)]
 #[CoversClass(Signer::class)]
@@ -26,7 +27,7 @@ public function testConnectProtocolCreationWithJwtOnly(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             user: $config->user,
             pass: $config->password,
             sig: null,
@@ -59,7 +60,7 @@ public function testConnectProtocolCreationWithNkeyOnly(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             user: $config->user,
             pass: $config->password,
             sig: $signature,
@@ -94,7 +95,7 @@ public function testConnectProtocolCreationWithBothJwtAndNkey(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             user: $config->user,
             pass: $config->password,
             sig: $signature,
@@ -122,7 +123,7 @@ public function testConnectProtocolCreationWithoutJwtAndNkey(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             user: $config->user,
             pass: $config->password,
             sig: null,
@@ -168,7 +169,7 @@ public function testConfigBackwardCompatibility(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             authToken: null,
             user: $config->user,
             pass: $config->password,
@@ -202,7 +203,7 @@ public function testJwtAndNkeyPrecedenceOverUserPassword(): void
             pedantic: $config->pedantic,
             tlsRequired: false,
             name: 'thesis/nats',
-            version: $config->version,
+            version: version('thesis/nats'),
             user: $config->user,
             pass: $config->password,
             sig: $signature,