diff --git a/src/Adapters/DatabaseAdapter.php b/src/Adapters/DatabaseAdapter.php
index 72e2d21..2709253 100755
--- a/src/Adapters/DatabaseAdapter.php
+++ b/src/Adapters/DatabaseAdapter.php
@@ -7,6 +7,7 @@ namespace Lauthz\Adapters;
 use Lauthz\Models\Rule;
 use Lauthz\Contracts\DatabaseAdapter as DatabaseAdapterContract;
 use Lauthz\Contracts\BatchDatabaseAdapter as BatchDatabaseAdapterContract;
+use Lauthz\Contracts\UpdatableDatabaseAdapter as UpdatableDatabaseAdapterContract; 
 use Casbin\Model\Model;
 use Casbin\Persist\AdapterHelper;
 use DateTime;
@@ -15,7 +16,7 @@ use DateTime;
  *
  * @author techlee@qq.com
  */
-class DatabaseAdapter implements DatabaseAdapterContract, BatchDatabaseAdapterContract
+class DatabaseAdapter implements DatabaseAdapterContract, BatchDatabaseAdapterContract, UpdatableDatabaseAdapterContract
 {
     use AdapterHelper;
 
@@ -207,4 +208,28 @@ class DatabaseAdapter implements DatabaseAdapterContract, BatchDatabaseAdapterCo
             }
         }
     }
+
+    /**
+     * Updates a policy rule from storage.
+     * This is part of the Auto-Save feature.
+     *
+     * @param string $sec
+     * @param string $ptype
+     * @param string[] $oldRule
+     * @param string[] $newPolicy
+     */
+    public function updatePolicy(string $sec, string $ptype, array $oldRule, array $newPolicy): void
+    {
+        $instance = $this->eloquent->where('p_type', $ptype);
+        foreach($oldRule as $k => $v) {
+            $instance->where('v' . $k, $v);
+        }
+        $instance->first();
+        $update = [];
+        foreach($newPolicy as $k => $v) {
+            $item = 'v' . $k;
+            $update[$item] = $k;
+        }
+        $instance->update($update);
+    }
 }
diff --git a/src/Contracts/UpdatableDatabaseAdapter.php b/src/Contracts/UpdatableDatabaseAdapter.php
new file mode 100644
index 0000000..581f410
--- /dev/null
+++ b/src/Contracts/UpdatableDatabaseAdapter.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Lauthz\Contracts;
+
+use Casbin\Persist\UpdatableAdapter;
+
+interface UpdatableDatabaseAdapter extends UpdatableAdapter
+{
+}
diff --git a/tests/DatabaseAdapterTest.php b/tests/DatabaseAdapterTest.php
index 48966dd..b147dfa 100644
--- a/tests/DatabaseAdapterTest.php
+++ b/tests/DatabaseAdapterTest.php
@@ -101,4 +101,31 @@ class DatabaseAdapterTest extends TestCase
         $this->assertFalse(Enforcer::enforce('bob', 'data2', 'write'));
         $this->assertFalse(Enforcer::enforce('alice', 'data2', 'write'));
     }
+
+    public function testUpdatePolicy()
+    {
+        $this->assertEquals([
+            ['alice', 'data1', 'read'],
+            ['bob', 'data2', 'write'],
+            ['data2_admin', 'data2', 'read'],
+            ['data2_admin', 'data2', 'write'],
+        ], Enforcer::getPolicy());
+
+        Enforcer::updatePolicy(
+            ['alice', 'data1', 'read'],
+            ['alice', 'data1', 'write']
+        );
+
+        Enforcer::updatePolicy(
+            ['bob', 'data2', 'write'],
+            ['bob', 'data2', 'read']
+        );
+
+        $this->assertEquals([
+            ['alice', 'data1', 'write'],
+            ['bob', 'data2', 'read'],
+            ['data2_admin', 'data2', 'read'],
+            ['data2_admin', 'data2', 'write'],
+        ], Enforcer::getPolicy());
+    }
 }