diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9408c239..01fcaea3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   test:
-    name: Run tests with PHP v8.3
+    name: Run tests with PHP v8.4
     runs-on: ubuntu-latest
     steps:
       - name: Start Typesense
@@ -24,10 +24,10 @@ jobs:
           --enable-cors
 
       - uses: actions/checkout@v4
-      - name: Setup PHP 8.3
+      - name: Setup PHP 8.4
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           coverage: xdebug
       - uses: php-actions/composer@v6
       - name: Run tests
diff --git a/src/CurationSet.php b/src/CurationSet.php
index db1c7fec..ad466c8e 100644
--- a/src/CurationSet.php
+++ b/src/CurationSet.php
@@ -22,10 +22,7 @@ class CurationSet
      */
     private ApiCall $apiCall;
 
-    /**
-     * @var CurationSetItems
-     */
-    private CurationSetItems $items;
+    private array $typesenseCurationSetItems = [];
 
     /**
      * CurationSet constructor.
@@ -37,7 +34,24 @@ public function __construct(string $curationSetName, ApiCall $apiCall)
     {
         $this->curationSetName = $curationSetName;
         $this->apiCall         = $apiCall;
-        $this->items           = new CurationSetItems($curationSetName, $apiCall);
+    }
+
+    /**
+     * @param $id
+     *
+     * @return mixed
+     */
+    public function __get($id)
+    {
+        if (isset($this->{$id})) {
+            return $this->{$id};
+        }
+
+        if (!isset($this->typesenseCurationSetItems[$id])) {
+            $this->typesenseCurationSetItems[$id] = new CurationSetItems($this->curationSetName, $this->apiCall);
+        }
+
+        return $this->typesenseCurationSetItems[$id];
     }
 
     /**
@@ -86,6 +100,6 @@ public function delete(): array
      */
     public function getItems(): CurationSetItems
     {
-        return $this->items;
+        return $this->__get('items');
     }
 }
diff --git a/src/SynonymSet.php b/src/SynonymSet.php
index 95aa4775..e8d5c86a 100644
--- a/src/SynonymSet.php
+++ b/src/SynonymSet.php
@@ -21,6 +21,8 @@ class SynonymSet
      * @var ApiCall
      */
     private ApiCall $apiCall;
+    
+    private array $typesenseSynonymSetItems = [];
 
     /**
      * SynonymSet constructor.
@@ -34,6 +36,24 @@ public function __construct(string $synonymSetName, ApiCall $apiCall)
         $this->apiCall        = $apiCall;
     }
 
+    /**
+     * @param $id
+     *
+     * @return mixed
+     */
+    public function __get($id)
+    {
+        if (isset($this->{$id})) {
+            return $this->{$id};
+        }
+
+        if (!isset($this->typesenseSynonymSetItems[$id])) {
+            $this->typesenseSynonymSetItems[$id] = new SynonymSetItems($this->synonymSetName, $this->apiCall);
+        }
+
+        return $this->typesenseSynonymSetItems[$id];
+    }
+
     /**
      * @return string
      */
@@ -74,4 +94,12 @@ public function delete(): array
     {
         return $this->apiCall->delete($this->endPointPath());
     }
-} 
\ No newline at end of file
+
+    /**
+     * @return SynonymSetItems
+     */
+    public function getItems(): SynonymSetItems
+    {
+        return $this->__get('items');
+    }
+}
diff --git a/src/SynonymSetItem.php b/src/SynonymSetItem.php
new file mode 100644
index 00000000..e3ac6971
--- /dev/null
+++ b/src/SynonymSetItem.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Typesense;
+
+use Http\Client\Exception as HttpClientException;
+use Typesense\Exceptions\TypesenseClientError;
+
+/**
+ * Class SynonymSetItem
+ *
+ * @package \Typesense
+ */
+class SynonymSetItem
+{
+    /**
+     * @var string
+     */
+    private string $synonymSetName;
+
+    /**
+     * @var string
+     */
+    private string $itemId;
+
+    /**
+     * @var ApiCall
+     */
+    private ApiCall $apiCall;
+
+    /**
+     * SynonymSetItem constructor.
+     *
+     * @param string $synonymSetName
+     * @param string $itemId
+     * @param ApiCall $apiCall
+     */
+    public function __construct(string $synonymSetName, string $itemId, ApiCall $apiCall)
+    {
+        $this->synonymSetName = $synonymSetName;
+        $this->itemId         = $itemId;
+        $this->apiCall        = $apiCall;
+    }
+
+    /**
+     * @return string
+     */
+    private function endPointPath(): string
+    {
+        return sprintf(
+            '%s/%s/items/%s',
+            SynonymSets::RESOURCE_PATH,
+            encodeURIComponent($this->synonymSetName),
+            encodeURIComponent($this->itemId)
+        );
+    }
+
+    /**
+     * @return array
+     * @throws TypesenseClientError|HttpClientException
+     */
+    public function retrieve(): array
+    {
+        return $this->apiCall->get($this->endPointPath(), []);
+    }
+
+    /**
+     * @param array $params
+     *
+     * @return array
+     * @throws TypesenseClientError|HttpClientException
+     */
+    public function upsert(array $params): array
+    {
+        return $this->apiCall->put($this->endPointPath(), $params);
+    }
+
+    /**
+     * @return array
+     * @throws TypesenseClientError|HttpClientException
+     */
+    public function delete(): array
+    {
+        return $this->apiCall->delete($this->endPointPath());
+    }
+}
diff --git a/src/SynonymSetItems.php b/src/SynonymSetItems.php
new file mode 100644
index 00000000..ce7141ad
--- /dev/null
+++ b/src/SynonymSetItems.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Typesense;
+
+use Http\Client\Exception as HttpClientException;
+use Typesense\Exceptions\TypesenseClientError;
+
+/**
+ * Class SynonymSetItems
+ *
+ * @package \Typesense
+ */
+class SynonymSetItems implements \ArrayAccess
+{
+    /**
+     * @var string
+     */
+    private string $synonymSetName;
+
+    /**
+     * @var ApiCall
+     */
+    private ApiCall $apiCall;
+
+    /**
+     * @var array
+     */
+    private array $items = [];
+
+    /**
+     * SynonymSetItems constructor.
+     *
+     * @param string $synonymSetName
+     * @param ApiCall $apiCall
+     */
+    public function __construct(string $synonymSetName, ApiCall $apiCall)
+    {
+        $this->synonymSetName = $synonymSetName;
+        $this->apiCall        = $apiCall;
+    }
+
+    /**
+     * @return string
+     */
+    private function endPointPath(): string
+    {
+        return sprintf(
+            '%s/%s/items',
+            SynonymSets::RESOURCE_PATH,
+            encodeURIComponent($this->synonymSetName)
+        );
+    }
+
+    /**
+     * @return array
+     * @throws TypesenseClientError|HttpClientException
+     */
+    public function retrieve(): array
+    {
+        return $this->apiCall->get($this->endPointPath(), []);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function offsetExists($itemId): bool
+    {
+        return isset($this->items[$itemId]);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function offsetGet($itemId): SynonymSetItem
+    {
+        if (!isset($this->items[$itemId])) {
+            $this->items[$itemId] = new SynonymSetItem($this->synonymSetName, $itemId, $this->apiCall);
+        }
+
+        return $this->items[$itemId];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function offsetSet($itemId, $value): void
+    {
+        $this->items[$itemId] = $value;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function offsetUnset($itemId): void
+    {
+        unset($this->items[$itemId]);
+    }
+}
diff --git a/tests/Feature/SynonymSetItemsTest.php b/tests/Feature/SynonymSetItemsTest.php
new file mode 100644
index 00000000..f30428a5
--- /dev/null
+++ b/tests/Feature/SynonymSetItemsTest.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Feature;
+
+use Tests\TestCase;
+use Exception;
+
+class SynonymSetItemsTest extends TestCase
+{
+    private $synonymSets = null;
+    private $synonymSetData = [
+        'items' => [
+            [
+                'id' => 'synonym-rule-1',
+                'synonyms' => ['foo', 'bar', 'baz'],
+                'root' => '',
+            ],
+        ],
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        if (!$this->isV30OrAbove()) {
+            $this->markTestSkipped('SynonymSetItems is only supported in Typesense v30+');
+        }
+
+        $this->synonymSets = $this->client()->synonymSets;
+        $this->synonymSets->upsert('test-synonym-set-items', $this->synonymSetData);
+    }
+
+    protected function tearDown(): void
+    {
+        try {
+            if ($this->synonymSets !== null) {
+                $this->synonymSets['test-synonym-set-items']->delete();
+            }
+        } catch (Exception $e) {
+            // Ignore cleanup errors
+        }
+        parent::tearDown();
+    }
+
+    public function testCanListItemsInASynonymSet(): void
+    {
+        $items = $this->synonymSets['test-synonym-set-items']->getItems()->retrieve();
+
+        $this->assertIsArray($items);
+        $this->assertGreaterThan(0, count($items));
+        $this->assertEquals('foo', $items[0]['synonyms'][0]);
+    }
+
+    public function testCanUpsertRetrieveAndDeleteAnItem(): void
+    {
+        $upserted = $this->synonymSets['test-synonym-set-items']->getItems()['synonym-rule-1']->upsert([
+            'id' => 'synonym-rule-1',
+            'synonyms' => ['red', 'crimson'],
+            'root' => '',
+        ]);
+
+        $this->assertEquals('synonym-rule-1', $upserted['id']);
+
+        $fetched = $this->synonymSets['test-synonym-set-items']->getItems()['synonym-rule-1']->retrieve();
+        $this->assertEquals('red', $fetched['synonyms'][0]);
+
+        $deletion = $this->synonymSets['test-synonym-set-items']->getItems()['synonym-rule-1']->delete();
+        $this->assertEquals('synonym-rule-1', $deletion['id']);
+    }
+}