diff --git a/src/ConvertKit_API_Traits.php b/src/ConvertKit_API_Traits.php
index 28e03a6..93f1c2e 100644
--- a/src/ConvertKit_API_Traits.php
+++ b/src/ConvertKit_API_Traits.php
@@ -1514,6 +1514,7 @@ public function create_subscribers(array $subscribers, string $callback_url = ''
      *                                                              - 'count_less_than' (int|null).
      *                                                              - 'after' (\DateTime|null).
      *                                                              - 'before' (\DateTime|null).
+     *                                                              - 'states' (array<string>).
      *                                                              - 'any' (array<int|string, mixed>|null).
      * @param boolean                          $include_total_count To include the total count of records in the response, use true.
      * @param string                           $after_cursor        Return results after the given pagination cursor.
@@ -1538,6 +1539,10 @@ public function filter_subscribers(
         foreach ($all as $condition) {
             $option = [];
 
+            if (array_key_exists('type', $condition) && !empty($condition['type'])) {
+                $option['type'] = $condition['type'];
+            }
+
             if (array_key_exists('count_greater_than', $condition) && $condition['count_greater_than'] !== null) {
                 $option['count_greater_than'] = $condition['count_greater_than'];
             }
@@ -1554,6 +1559,10 @@ public function filter_subscribers(
                 $option['before'] = $condition['before']->format('Y-m-d');
             }
 
+            if (array_key_exists('states', $condition) && !empty($condition['states'])) {
+                $option['states'] = (array) $condition['states'];
+            }
+
             if (array_key_exists('any', $condition) && !empty($condition['any'])) {
                 $option['any'] = (array) $condition['any'];
             }
diff --git a/tests/ConvertKitAPITest.php b/tests/ConvertKitAPITest.php
index c2b013a..33bb640 100644
--- a/tests/ConvertKitAPITest.php
+++ b/tests/ConvertKitAPITest.php
@@ -4438,6 +4438,9 @@ public function testFilterSubscribers()
                     'count_less_than' => 100,
                     'after' => new \DateTime('2024-01-01'),
                     'before' => new \DateTime('2027-01-01'),
+                    'states' => [
+                        'active',
+                    ],
                 ]
             ]
         );
@@ -4465,6 +4468,9 @@ public function testFilterSubscribersWithMultipleConditions()
                     'count_less_than' => 100,
                     'after' => new \DateTime('2024-01-01'),
                     'before' => new \DateTime('2027-01-01'),
+                    'states' => [
+                        'active',
+                    ],
                 ],
                 [
                     'type' => 'clicks',
@@ -4483,7 +4489,7 @@ public function testFilterSubscribersWithMultipleConditions()
 
     /**
      * Test that filter_subscribers() returns the expected data
-     * when multiple any conditions are specified.
+     * when no parameters are specified.
      *
      * @since   2.4.0
      *
@@ -4498,6 +4504,29 @@ public function testFilterSubscribersWithNoParameters()
         $this->assertPaginationExists($result);
     }
 
+    /**
+     * Test that filter_subscribers() throws a ServerException
+     * when invalid parameters are specified.
+     *
+     * @since   2.4.0
+     *
+     * @return void
+     */
+    public function testFilterSubscribersWithInvalidParameters()
+    {
+        $this->expectException(ServerException::class);
+        $result = $this->api->filter_subscribers(
+            [
+                [
+                    'foo' => 'bar',
+                ],
+                [
+                    'type' => 'not-a-real-type',
+                ]
+            ]
+        );
+    }
+
     /**
      * Test that filter_subscribers() returns the expected data
      * when the total count is included.