diff --git a/README.md b/README.md
index 7edafd7..25fa5a1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 Camelot Doctrine Inheritance Mapping
 ====================================
 
+**NOTE:** For legacy PHP support (7.1+) please use the 1.0 branch. 
+
 Installation
 ------------
 
diff --git a/composer.json b/composer.json
index 41eb9c5..132c92e 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license": "MIT",
     "keywords": ["doctrine", "orm", "inheritance-mapping", "symfony", "symfony-bundle"],
     "require": {
-        "php": "^7.1.3",
+        "php": "^7.4",
         "doctrine/annotations": "^1.7",
         "doctrine/orm": "^2.5.11"
     },
diff --git a/src/Annotation/DiscriminatorMapItem.php b/src/Annotation/DiscriminatorMapItem.php
index a9492a4..45ef759 100644
--- a/src/Annotation/DiscriminatorMapItem.php
+++ b/src/Annotation/DiscriminatorMapItem.php
@@ -11,8 +11,7 @@
  */
 final class DiscriminatorMapItem
 {
-    /** @var string|null */
-    private $value;
+    private ?string $value;
 
     public function __construct(array $data)
     {
diff --git a/src/Annotation/DiscriminatorMapLoader.php b/src/Annotation/DiscriminatorMapLoader.php
index aa57423..cb5adec 100644
--- a/src/Annotation/DiscriminatorMapLoader.php
+++ b/src/Annotation/DiscriminatorMapLoader.php
@@ -18,12 +18,9 @@
  */
 final class DiscriminatorMapLoader
 {
-    /** @var Reader */
-    private $reader;
-    /** @var MappingDriver */
-    private $mappingDriver;
-    /** @var array */
-    private $cachedMap;
+    private Reader $reader;
+    private MappingDriver $mappingDriver;
+    private array $cachedMap;
 
     public function __construct(Reader $reader, Configuration $config)
     {
diff --git a/src/EventSubscriber/DiscriminatorSubscriber.php b/src/EventSubscriber/DiscriminatorSubscriber.php
index 50e4f69..d14a743 100644
--- a/src/EventSubscriber/DiscriminatorSubscriber.php
+++ b/src/EventSubscriber/DiscriminatorSubscriber.php
@@ -9,8 +9,7 @@
 
 class DiscriminatorSubscriber implements EventSubscriber
 {
-    /** @var DiscriminatorMapLoader */
-    private $loader;
+    private DiscriminatorMapLoader $loader;
 
     public function __construct(DiscriminatorMapLoader $loader)
     {
diff --git a/tests/Fixtures/Entity/SingleTable.php b/tests/Fixtures/Entity/SingleTable.php
index edb5326..0a71c45 100644
--- a/tests/Fixtures/Entity/SingleTable.php
+++ b/tests/Fixtures/Entity/SingleTable.php
@@ -13,10 +13,8 @@
  */
 class SingleTable
 {
-    /** @var UuidInterface|null */
-    protected $id = null;
-    /** @var string|null */
-    protected $title = null;
+    protected ?UuidInterface $id = null;
+    protected ?string $title = null;
 
     public function getId(): ?UuidInterface
     {
diff --git a/tests/Fixtures/Entity/SingleTableChild.php b/tests/Fixtures/Entity/SingleTableChild.php
index a380567..4816c8d 100644
--- a/tests/Fixtures/Entity/SingleTableChild.php
+++ b/tests/Fixtures/Entity/SingleTableChild.php
@@ -13,8 +13,7 @@
  */
 class SingleTableChild extends SingleTable
 {
-    /** @var int|null */
-    private $awesomeness = null;
+    private ?int $awesomeness = null;
 
     public function getAwesomeness(): ?int
     {
diff --git a/tests/Fixtures/Entity/SingleTableGrandchild.php b/tests/Fixtures/Entity/SingleTableGrandchild.php
index 733d68a..c4dc4c6 100644
--- a/tests/Fixtures/Entity/SingleTableGrandchild.php
+++ b/tests/Fixtures/Entity/SingleTableGrandchild.php
@@ -13,8 +13,7 @@
  */
 class SingleTableGrandchild extends SingleTableChild
 {
-    /** @var int|null */
-    private $vitality = null;
+    private ?int $vitality = null;
 
     public function getVitality(): ?int
     {