diff --git a/src/Shared/v2/Api.php b/src/Shared/v2/Api.php
index dda53032..ab0f9732 100644
--- a/src/Shared/v2/Api.php
+++ b/src/Shared/v2/Api.php
@@ -226,4 +226,24 @@ public function deleteShareAccessRule(): array
             ],
         ];
     }
+    /**
+     * @link https://docs.openstack.org/api-ref/shared-file-system/?expanded=extend-share-detail#extend-share
+     * @return array
+     */
+    public function extendShare(): array
+    {
+        return [
+            'method'  => 'POST',
+            'path'    => 'shares/{id}/action',
+            'jsonKey' => 'extend',
+            'params'  => [
+                'id' => $this->params->shareIdPath(),
+                'new_size' => $this->params->size(),
+            ],
+            'headers' => [
+                'Vary' => 'X-OpenStack-Manila-API-Version',
+                'X-Openstack-Manila-Api-Version' => '2.42',
+            ],
+        ];
+    }
 }
diff --git a/src/Shared/v2/Models/Share.php b/src/Shared/v2/Models/Share.php
index 85933114..91d8d882 100644
--- a/src/Shared/v2/Models/Share.php
+++ b/src/Shared/v2/Models/Share.php
@@ -4,6 +4,7 @@
 
 namespace OpenStack\Shared\v2\Models;
 
+use RuntimeException;
 use DateTimeImmutable;
 use OpenStack\Common\Resource\Alias;
 use OpenStack\Common\Resource\OperatorResource;
@@ -159,6 +160,25 @@ public function delete()
     {
         $this->executeWithState($this->api->deleteShare());
     }
+
+    /**
+     * @param int $new_size
+     */
+    public function extend(int $new_size)
+    {
+        if (is_null($this->size)) {
+            $this->retrieve();
+        }
+
+        if ($new_size < $this->size) {
+            throw new RuntimeException(sprintf('The new size of the share must be larger than the current size of the share. Current size: %sGB. Requested new size: %sGB', $this->size, $new_size));
+        }
+
+        $this->execute($this->api->extendShare(), [
+            'id' => $this->id,
+            'new_size' => $new_size,
+        ]);
+    }
     /**
      * @return array
      */