diff --git a/src/ClientContextInterface.php b/src/ClientContextInterface.php
index e3521156..c6708fd2 100644
--- a/src/ClientContextInterface.php
+++ b/src/ClientContextInterface.php
@@ -68,8 +68,10 @@ use Predis\Command\CommandInterface;
  * @method $this cfmexists(string $key, ...$item)
  * @method $this cfinfo(string $key)
  * @method $this cfinsert(string $key, int $capacity = -1, bool $noCreate = false, string ...$item)
+ * @method $this cfinsertnx(string $key, int $capacity = -1, bool $noCreate = false, string ...$item)
  * @method $this cfreserve(string $key, int $capacity, int $bucketSize = -1, int $maxIterations = -1, int $expansion = -1)
  * @method $this cfscandump(string $key, int $iterator) * @method $this decr($key)
+ * @method $this decr($key)
  * @method $this decrby($key, $decrement)
  * @method $this failover(?To $to = null, bool $abort = false, int $timeout = -1)
  * @method $this get($key)
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index af26e273..6d000d1d 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -77,6 +77,7 @@ use Predis\Response\Status;
  * @method int               cfmexists(string $key, ...$item)
  * @method array             cfinfo(string $key)
  * @method array             cfinsert(string $key, int $capacity = -1, bool $noCreate = false, string ...$item)
+ * @method array             cfinsertnx(string $key, int $capacity = -1, bool $noCreate = false, string ...$item)
  * @method Status            cfreserve(string $key, int $capacity, int $bucketSize = -1, int $maxIterations = -1, int $expansion = -1)
  * @method array             cfscandump(string $key, int $iterator)
  * @method int               decr(string $key)
diff --git a/src/Command/Redis/CuckooFilter/CFINSERTNX.php b/src/Command/Redis/CuckooFilter/CFINSERTNX.php
new file mode 100644
index 00000000..629327b4
--- /dev/null
+++ b/src/Command/Redis/CuckooFilter/CFINSERTNX.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\CuckooFilter;
+
+/**
+ * @see https://redis.io/commands/cf.insertnx/
+ *
+ * Adds one or more items to a cuckoo filter, allowing the filter
+ * to be created with a custom capacity if it does not exist yet.
+ */
+class CFINSERTNX extends CFINSERT
+{
+    public function getId()
+    {
+        return 'CF.INSERTNX';
+    }
+}
diff --git a/tests/Predis/Command/Redis/CuckooFilter/CFINSERTNX_Test.php b/tests/Predis/Command/Redis/CuckooFilter/CFINSERTNX_Test.php
new file mode 100644
index 00000000..1a88d711
--- /dev/null
+++ b/tests/Predis/Command/Redis/CuckooFilter/CFINSERTNX_Test.php
@@ -0,0 +1,164 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\CuckooFilter;
+
+use Predis\Command\Redis\PredisCommandTestCase;
+use Predis\Response\ServerException;
+
+class CFINSERTNX_Test extends PredisCommandTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedCommand(): string
+    {
+        return CFINSERTNX::class;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedId(): string
+    {
+        return 'CFINSERTNX';
+    }
+
+    /**
+     * @group disconnected
+     * @dataProvider argumentsProvider
+     */
+    public function testFilterArguments(array $actualArguments, array $expectedArguments): void
+    {
+        $command = $this->getCommand();
+        $command->setArguments($actualArguments);
+
+        $this->assertSameValues($expectedArguments, $command->getArguments());
+    }
+
+    /**
+     * @group connected
+     * @dataProvider filtersProvider
+     * @param  array  $filterArguments
+     * @param  string $key
+     * @param  int    $expectedCapacity
+     * @param  array  $expectedResponse
+     * @return void
+     * @requiresRedisBfVersion >= 1.0.0
+     */
+    public function testInsertItemsIntoNonExistingCuckooFilter(
+        array $filterArguments,
+        string $key,
+        int $expectedCapacity,
+        array $expectedResponse
+    ): void {
+        $redis = $this->getClient();
+
+        $actualResponse = $redis->cfinsertnx(...$filterArguments);
+        $info = $redis->cfinfo($key);
+
+        $this->assertSame($expectedResponse, $actualResponse);
+        $this->assertSame($expectedCapacity, $info['Size']);
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 1.0.0
+     */
+    public function testDoNotInsertAlreadyExistingItems(): void
+    {
+        $redis = $this->getClient();
+
+        $redis->cfadd('filter', 'item1');
+        $redis->cfadd('filter', 'item2');
+
+        $actualResponse = $redis->cfinsertnx('filter', -1, false, 'item1', 'item2');
+        $this->assertSame([0, 0], $actualResponse);
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 1.0.0
+     */
+    public function testInsertThrowsErrorOnInsertingIntoNonExistingFilterWithNoCreateModifier(): void
+    {
+        $redis = $this->getClient();
+
+        $this->expectException(ServerException::class);
+        $this->expectExceptionMessage('ERR not found');
+
+        $redis->cfinsertnx('key', -1, true, 'item');
+    }
+
+    /**
+     * @group connected
+     * @return void
+     * @requiresRedisBfVersion >= 1.0.0
+     */
+    public function testInsertIntoAlreadyExistingFilterWithNoCreateModifier(): void
+    {
+        $redis = $this->getClient();
+
+        $redis->cfadd('filter', 'item');
+
+        $actualResponse = $redis->cfinsertnx('filter', -1, true, 'item1');
+        $this->assertSame([1], $actualResponse);
+    }
+
+    public function argumentsProvider(): array
+    {
+        return [
+            'with default arguments' => [
+                ['key', -1, false, 'item1'],
+                ['key', 'ITEMS', 'item1'],
+            ],
+            'with CAPACITY modifier' => [
+                ['key', 500, false, 'item1'],
+                ['key', 'CAPACITY', 500, 'ITEMS', 'item1'],
+            ],
+            'with NOCREATE modifier' => [
+                ['key', -1, true, 'item1'],
+                ['key', 'NOCREATE', 'ITEMS', 'item1'],
+            ],
+            'with all arguments' => [
+                ['key', 500, true, 'item1', 'item2'],
+                ['key', 'CAPACITY', 500, 'NOCREATE', 'ITEMS', 'item1', 'item2'],
+            ],
+        ];
+    }
+
+    public function filtersProvider(): array
+    {
+        return [
+            'with default arguments' => [
+                ['key', -1, false, 'item1'],
+                'key',
+                1080,
+                [1],
+            ],
+            'with modified CAPACITY' => [
+                ['key', 500, false, 'item1'],
+                'key',
+                568,
+                [1],
+            ],
+            'with multiple items' => [
+                ['key', -1, false, 'item1', 'item2'],
+                'key',
+                1080,
+                [1, 1],
+            ],
+        ];
+    }
+}