diff --git a/src/Personal.php b/src/Personal.php
index 1b80148..7683b00 100644
--- a/src/Personal.php
+++ b/src/Personal.php
@@ -15,7 +15,9 @@ use Web3\Providers\Provider;
 use Web3\Providers\HttpProvider;
 use Web3\RequestManagers\RequestManager;
 use Web3\RequestManagers\HttpRequestManager;
+use Web3\Validators\AddressValidator;
 use Web3\Validators\StringValidator;
+use Web3\Validators\QuantityValidator;
 
 class Personal
 {
@@ -40,6 +42,18 @@ class Personal
                 ]
             ]
         ],
+        'personal_unlockAccount' => [
+            'params' => [
+                [
+                    'validators' => AddressValidator::class
+                ], [
+                    'validators' => StringValidator::class
+                ], [
+                    'default' => 300,
+                    'validators' => QuantityValidator::class
+                ]
+            ]
+        ],
     ];
 
     /**
diff --git a/test/unit/PersonalApiTest.php b/test/unit/PersonalApiTest.php
index 768cfb1..11b53c5 100644
--- a/test/unit/PersonalApiTest.php
+++ b/test/unit/PersonalApiTest.php
@@ -70,6 +70,28 @@ class PersonalApiTest extends TestCase
         });
     }
 
+    /**
+     * testUnlockAccount
+     * 
+     * @return void
+     */
+    public function testUnlockAccount()
+    {
+        $personal = $this->personal;
+
+        $personal->unlockAccount('0x407d73d8a49eeb85d32cf465507dd71d507100c1', '123456', function ($err, $account) {
+            if ($err !== null) {
+                // infura banned us to use unlock account
+                return $this->assertTrue($err->getCode() === 405);
+            }
+            if (isset($account->result)) {
+                $this->assertTrue(is_array($account->result));
+            } else {
+                $this->fail($account->error->message);
+            }
+        });
+    }
+
     /**
      * testUnallowedMethod
      *