diff --git a/src/CollectionManager.php b/src/CollectionManager.php
index 68dc7fd..5dd1e9f 100644
--- a/src/CollectionManager.php
+++ b/src/CollectionManager.php
@@ -2,6 +2,7 @@
 
 namespace TSterker\SolariumCollectionManager;
 
+use InvalidArgumentException;
 use Solarium\Client;
 use Solarium\Core\Client\State\CollectionState;
 use Solarium\Core\Query\Result\ResultInterface;
@@ -85,7 +86,7 @@ public function ensureCollection(string $name): void
      */
     public function create(string $name, array $options = []): ResultInterface
     {
-        $options = array_merge([
+        $defaults = [
             'num_shards' => 1,
             'router_name' => 'compositeId',
             'nrt_replicas' => 1,  // alias: replication_factor
@@ -95,7 +96,15 @@ public function create(string $name, array $options = []): ResultInterface
             // NOTE: maxShardsPerNode has been removed in Solr 9.0
             // @see https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html
             // 'max_shards_per_node' => 1,
-        ], $options);
+        ];
+
+        $unknownKeys = array_diff_key($options, $defaults);
+
+        if (count($unknownKeys) > 0) {
+            throw new InvalidArgumentException("Unknown options: " . json_encode(array_keys($unknownKeys)));
+        }
+
+        $options = array_merge($defaults, $options);
 
         $q = $this->client->createCollections();
 
diff --git a/tests/Unit/CollectionManagerTest.php b/tests/Unit/CollectionManagerTest.php
index ec630b6..4ca53fb 100644
--- a/tests/Unit/CollectionManagerTest.php
+++ b/tests/Unit/CollectionManagerTest.php
@@ -2,6 +2,7 @@
 
 namespace TSterker\SolariumCollectionManager\Tests\Unit;
 
+use InvalidArgumentException;
 use Mockery;
 use Mockery\MockInterface;
 use Solarium\Client;
@@ -64,6 +65,21 @@ public function it_accepts_options()
 
         $this->assertEquals(['dummy' => 'data'], $data->getData());
     }
+
+    /** @test */
+    public function it_throws_on_unknown_options()
+    {
+        $manager = new CollectionManager(Mockery::mock(Client::class));
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage("Unknown options: [\"foo\",\"bar\"]");
+
+        $data = $manager->create('foo', [
+            'num_shards' => 111,
+            'foo' => 'xxx',
+            'bar' => 'yyy',
+        ]);
+    }
 }
 
 class ClientMockBuilder
@@ -80,10 +96,9 @@ public function __construct()
 
         $this->query = Mockery::mock(Query::class);
 
-        $this->client->shouldReceive('createCollections')->once()->andReturn($this->query);
+        $this->client->shouldReceive('createCollections')->andReturn($this->query);
 
         $this->client->shouldReceive('collections')
-            ->once()
             ->with($this->query)
             ->andReturn(Mockery::mock(
                 ClusterStatusResult::class,