diff --git a/app/Console/AbstractMappingCommand.php b/app/Console/AbstractMappingCommand.php
index 10ea985f..51f0acb5 100644
--- a/app/Console/AbstractMappingCommand.php
+++ b/app/Console/AbstractMappingCommand.php
@@ -8,15 +8,9 @@
 
 abstract class AbstractMappingCommand extends AbstractElasticSearchCommand
 {
-    /**
-     * @var string
-     */
-    protected $indexName;
+    protected string $indexName;
 
-    /**
-     * @var string
-     */
-    protected $documentType;
+    protected string $documentType;
 
     public function __construct(Client $client, string $indexName, string $documentType)
     {
diff --git a/app/Console/AbstractReindexCommand.php b/app/Console/AbstractReindexCommand.php
index 5f294c51..088b8771 100644
--- a/app/Console/AbstractReindexCommand.php
+++ b/app/Console/AbstractReindexCommand.php
@@ -15,25 +15,13 @@
 
 abstract class AbstractReindexCommand extends AbstractElasticSearchCommand
 {
-    /**
-     * @var string
-     */
-    private $readIndexName;
-
-    /**
-     * @var string
-     */
-    private $scrollTtl;
-
-    /**
-     * @var int
-     */
-    private $scrollSize;
-
-    /**
-     * @var int
-     */
-    private $bulkThreshold;
+    private string $readIndexName;
+
+    private string $scrollTtl;
+
+    private int $scrollSize;
+
+    private int $bulkThreshold;
 
     private EventBus $eventBus;
 
diff --git a/src/ElasticSearch/Aggregation/Aggregation.php b/src/ElasticSearch/Aggregation/Aggregation.php
index 68d46f6c..497ee3e3 100644
--- a/src/ElasticSearch/Aggregation/Aggregation.php
+++ b/src/ElasticSearch/Aggregation/Aggregation.php
@@ -18,7 +18,7 @@ final class Aggregation
     /**
      * @var Bucket[]
      */
-    private $buckets;
+    private array $buckets;
 
     /**
      * @param Bucket ...$buckets
diff --git a/src/ElasticSearch/JsonDocument/Properties/Url.php b/src/ElasticSearch/JsonDocument/Properties/Url.php
index ea486b9c..bde44825 100644
--- a/src/ElasticSearch/JsonDocument/Properties/Url.php
+++ b/src/ElasticSearch/JsonDocument/Properties/Url.php
@@ -10,10 +10,7 @@ final class Url
 {
     private string $url;
 
-    /**
-     * @var array
-     */
-    private $urlParts;
+    private array $urlParts;
 
     public function __construct(string $url)
     {
diff --git a/src/ElasticSearch/Operations/AbstractReindexUDB3CoreOperation.php b/src/ElasticSearch/Operations/AbstractReindexUDB3CoreOperation.php
index 1f2e16fa..a92eb9a1 100644
--- a/src/ElasticSearch/Operations/AbstractReindexUDB3CoreOperation.php
+++ b/src/ElasticSearch/Operations/AbstractReindexUDB3CoreOperation.php
@@ -20,15 +20,9 @@ abstract class AbstractReindexUDB3CoreOperation extends AbstractElasticSearchOpe
 {
     private EventBus $eventBus;
 
-    /**
-     * @var string
-     */
-    private $scrollTtl;
+    private string $scrollTtl;
 
-    /**
-     * @var int
-     */
-    private $scrollSize;
+    private int $scrollSize;
 
     public function __construct(
         Client $client,
diff --git a/src/Http/Offer/RequestParser/CompositeOfferRequestParser.php b/src/Http/Offer/RequestParser/CompositeOfferRequestParser.php
index 8963988a..72d14e36 100644
--- a/src/Http/Offer/RequestParser/CompositeOfferRequestParser.php
+++ b/src/Http/Offer/RequestParser/CompositeOfferRequestParser.php
@@ -12,7 +12,7 @@ final class CompositeOfferRequestParser implements OfferRequestParserInterface
     /**
      * @var OfferRequestParserInterface[]
      */
-    private $parsers = [];
+    private array $parsers = [];
 
     public function __construct()
     {
diff --git a/src/Http/Organizer/RequestParser/CompositeOrganizerRequestParser.php b/src/Http/Organizer/RequestParser/CompositeOrganizerRequestParser.php
index 72fc594b..b57d5a5e 100644
--- a/src/Http/Organizer/RequestParser/CompositeOrganizerRequestParser.php
+++ b/src/Http/Organizer/RequestParser/CompositeOrganizerRequestParser.php
@@ -12,7 +12,7 @@ final class CompositeOrganizerRequestParser implements OrganizerRequestParser
     /**
      * @var OrganizerRequestParser[]
      */
-    private $parsers = [];
+    private array $parsers = [];
 
     public function __construct()
     {
diff --git a/src/JsonDocument/CompositeJsonTransformer.php b/src/JsonDocument/CompositeJsonTransformer.php
index d0420a85..5edc9f6a 100644
--- a/src/JsonDocument/CompositeJsonTransformer.php
+++ b/src/JsonDocument/CompositeJsonTransformer.php
@@ -9,7 +9,7 @@ final class CompositeJsonTransformer implements JsonTransformer
     /**
      * @var JsonTransformer[]
      */
-    private $jsonTransformers;
+    private array $jsonTransformers;
 
     public function __construct(JsonTransformer ...$jsonTransformers)
     {
diff --git a/src/Language/MultilingualString.php b/src/Language/MultilingualString.php
index eb5ccd0c..e6a358fb 100644
--- a/src/Language/MultilingualString.php
+++ b/src/Language/MultilingualString.php
@@ -12,11 +12,7 @@ final class MultilingualString
 
     private string $originalString;
 
-    /**
-     * @var string[]
-     *   Associative array with languages as keys and translations as values.
-     */
-    private $translations;
+    private array $translations;
 
     public function __construct(Language $originalLanguage, string $originalString)
     {
diff --git a/src/PagedResultSet.php b/src/PagedResultSet.php
index aa2ec763..bc8c4c24 100644
--- a/src/PagedResultSet.php
+++ b/src/PagedResultSet.php
@@ -22,7 +22,7 @@ final class PagedResultSet
     /**
      * @var FacetTreeInterface[]
      */
-    private $facets;
+    private array $facets;
 
     /**
      * @param JsonDocument[] $results
diff --git a/tests/AMQP/DomainMessageJSONDeserializerTest.php b/tests/AMQP/DomainMessageJSONDeserializerTest.php
index 9310069f..0b05f069 100644
--- a/tests/AMQP/DomainMessageJSONDeserializerTest.php
+++ b/tests/AMQP/DomainMessageJSONDeserializerTest.php
@@ -16,10 +16,7 @@
 
 final class DomainMessageJSONDeserializerTest extends TestCase
 {
-    /**
-     * @var DomainMessageJSONDeserializer
-     */
-    protected $domainMessageJSONDeserializer;
+    protected DomainMessageJSONDeserializer $domainMessageJSONDeserializer;
 
     protected function setUp(): void
     {
diff --git a/tests/AMQP/Dummies/DummyEvent.php b/tests/AMQP/Dummies/DummyEvent.php
index 3c8d3a22..e9f818de 100644
--- a/tests/AMQP/Dummies/DummyEvent.php
+++ b/tests/AMQP/Dummies/DummyEvent.php
@@ -8,15 +8,9 @@
 
 final class DummyEvent implements Serializable
 {
-    /**
-     * @var string
-     */
-    private $id;
+    private string $id;
 
-    /**
-     * @var string
-     */
-    private $content;
+    private string $content;
 
     public function __construct(string $id, string $content)
     {
diff --git a/tests/Deserializer/SimpleDeserializerLocatorTest.php b/tests/Deserializer/SimpleDeserializerLocatorTest.php
index 9ddd642d..d8c7c2ac 100644
--- a/tests/Deserializer/SimpleDeserializerLocatorTest.php
+++ b/tests/Deserializer/SimpleDeserializerLocatorTest.php
@@ -8,10 +8,7 @@
 
 final class SimpleDeserializerLocatorTest extends TestCase
 {
-    /**
-     * @var SimpleDeserializerLocator
-     */
-    protected $deserializerLocator;
+    protected SimpleDeserializerLocator $deserializerLocator;
 
     public function setUp(): void
     {
diff --git a/tests/ElasticSearch/Aggregation/NodeMapAggregationTransformerTest.php b/tests/ElasticSearch/Aggregation/NodeMapAggregationTransformerTest.php
index 4c84b5be..7c74a0e7 100644
--- a/tests/ElasticSearch/Aggregation/NodeMapAggregationTransformerTest.php
+++ b/tests/ElasticSearch/Aggregation/NodeMapAggregationTransformerTest.php
@@ -17,19 +17,13 @@ final class NodeMapAggregationTransformerTest extends TestCase
 {
     private FacetName $facetName;
 
-    /**
-     * @var array
-     */
-    private $nodeMap;
-
-
     private NodeMapAggregationTransformer $transformer;
 
     protected function setUp(): void
     {
         $this->facetName = FacetName::regions();
 
-        $this->nodeMap = [
+        $nodeMap = [
             'prv-vlaams-brabant' => [
                 'name' => [
                     'nl' => 'Vlaams-Brabant',
@@ -82,7 +76,7 @@ protected function setUp(): void
 
         $this->transformer = new NodeMapAggregationTransformer(
             $this->facetName,
-            $this->nodeMap
+            $nodeMap
         );
     }
 
diff --git a/tests/ElasticSearch/JsonDocument/JsonLdPolyfillJsonTransformerTest.php b/tests/ElasticSearch/JsonDocument/JsonLdPolyfillJsonTransformerTest.php
index 62688205..97f8a50b 100644
--- a/tests/ElasticSearch/JsonDocument/JsonLdPolyfillJsonTransformerTest.php
+++ b/tests/ElasticSearch/JsonDocument/JsonLdPolyfillJsonTransformerTest.php
@@ -8,12 +8,7 @@
 
 final class JsonLdPolyfillJsonTransformerTest extends TestCase
 {
-    /**
-     * @var array
-     *  The JSON-LD that should be poly-filled
-     */
-    private $given;
-
+    private array $given;
 
     private JsonLdPolyfillJsonTransformer $transformer;