diff --git a/.gitignore b/.gitignore
index abb9c75..c535968 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /vendor
 /composer.lock
 /phpunit.xml
+/.phpunit.result.cache
+/.vscode
diff --git a/.travis.yml b/.travis.yml
index b354a79..57742af 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,39 +1,34 @@
 language: php
 
+services:
+  - postgresql
+  - mysql
+
 php:
-  - 5.6
-  - 7.0
-  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
 
 sudo: false
 
 env:
-  - DB=mysql db_dsn='mysql://travis@0.0.0.0/cakephp_test'
-  - DB=pgsql db_dsn='postgres://travis@127.0.0.1/cakephp_test'
-  - DB=sqlite
+  matrix:
+    - DB=mysql DB_DSN='mysql://root@127.0.0.1/cakephp_test'
+    - DB=pgsql DB_DSN='postgres://postgres@127.0.0.1/cakephp_test'
+    - DB=sqlite DB_DSN='sqlite:///:memory:'
 
 matrix:
   fast_finish: true
-  include:
-    - php: 7.0
-      env: COVERAGE=1
+
+before_install:
+  - if [[ $DB == 'mysql' ]]; then mysql -u root -e 'CREATE DATABASE cakephp_test;'; fi
+  - if [[ $DB == 'pgsql' ]]; then psql -c 'CREATE DATABASE cakephp_test;' -U postgres; fi
 
 install:
-  - composer self-update
   - composer install --prefer-dist --no-interaction
 
-before_script:
-  - if [[ $DB == 'mysql' ]]; then mysql -e 'CREATE DATABASE cakephp_test;'; fi
-  - if [[ $DB == 'pgsql' ]]; then psql -c 'CREATE DATABASE cakephp_test;' -U postgres; fi
-  - phpenv rehash
-  - set +H
-
 script:
-  - if [[ $COVERAGE == 1 ]]; then phpdbg -qrr vendor/bin/phpunit --coverage-clover=coverage.xml; fi
-  - if [[ $COVERAGE != 1 ]]; then vendor/bin/phpunit; fi
-
-after_success:
-  - if [[ $COVERAGE == 1 ]]; then bash <(curl -s https://codecov.io/bash); fi
+  - vendor/bin/phpunit
 
 notifications:
   email: false
diff --git a/composer.json b/composer.json
index e2349ee..0fa922b 100644
--- a/composer.json
+++ b/composer.json
@@ -6,12 +6,12 @@
         "cakephp", "plugin", "lazy load"
     ],
     "require-dev": {
-        "phpunit/phpunit": "^5.7|^6.0",
+        "phpunit/phpunit": "^8.5",
         "cakephp/cakephp-codesniffer": "dev-master",
-        "cakephp/cakephp": ">=3.6.0 <4.0"
+        "cakephp/cakephp": "^4.0"
     },
     "require": {
-        "cakephp/orm": ">=3.6.0 <4.0"
+        "cakephp/orm": "^4.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 90dce14..05b40ff 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -3,7 +3,6 @@
     colors="true"
     processIsolation="false"
     stopOnFailure="false"
-    syntaxCheck="false"
     bootstrap="./tests/bootstrap.php"
 >
 
diff --git a/src/ORM/LazyLoadEntityTrait.php b/src/ORM/LazyLoadEntityTrait.php
index d176fd8..0068b54 100644
--- a/src/ORM/LazyLoadEntityTrait.php
+++ b/src/ORM/LazyLoadEntityTrait.php
@@ -58,7 +58,7 @@ protected function &_parentGet($property)
      * @param string|array $property Property
      * @return bool
      */
-    public function has($property)
+    public function has($property): bool
     {
         foreach ((array)$property as $prop) {
             $has = $this->_parentHas($prop);
@@ -115,8 +115,8 @@ protected function _lazyLoad($property)
         }
 
         // check if the property was set as null to begin with
-        if (array_key_exists($property, $this->_properties)) {
-            return $this->_properties[$property];
+        if (array_key_exists($property, $this->_fields)) {
+            return $this->_fields[$property];
         }
 
         $repository = $this->_repository($property);
@@ -135,11 +135,11 @@ protected function _lazyLoad($property)
         $repository->loadInto($this, [$association->getName()]);
 
         // check if the association didn't exist and therefore didn't load
-        if (!isset($this->_properties[$property])) {
+        if (!isset($this->_fields[$property])) {
             return null;
         }
 
-        return $this->_properties[$property];
+        return $this->_fields[$property];
     }
 
     /**
@@ -150,7 +150,7 @@ protected function _lazyLoad($property)
     protected function _repository()
     {
         $source = $this->getSource();
-        if ($source === null) {
+        if (empty($source)) {
             list(, $class) = namespaceSplit(get_class($this));
             $source = Inflector::pluralize($class);
         }
diff --git a/tests/TestCase/ORM/LazyLoadEntityTraitTest.php b/tests/TestCase/ORM/LazyLoadEntityTraitTest.php
index 40a8e9b..1ecf704 100644
--- a/tests/TestCase/ORM/LazyLoadEntityTraitTest.php
+++ b/tests/TestCase/ORM/LazyLoadEntityTraitTest.php
@@ -4,7 +4,6 @@
 use Cake\Datasource\EntityInterface;
 use Cake\ORM\Entity;
 use Cake\ORM\Locator\LocatorAwareTrait;
-use Cake\ORM\TableRegistry;
 use Cake\TestSuite\TestCase;
 use JeremyHarris\LazyLoad\TestApp\Model\Entity\Comment;
 use JeremyHarris\LazyLoad\TestApp\Model\Entity\LazyLoadableEntity;
@@ -27,12 +26,12 @@ class LazyLoadEntityTraitTest extends TestCase
      * @var array
      */
     public $fixtures = [
-        'plugin.JeremyHarris\LazyLoad.articles',
-        'plugin.JeremyHarris\LazyLoad.articles_tags',
-        'plugin.JeremyHarris\LazyLoad.authors',
-        'plugin.JeremyHarris\LazyLoad.comments',
-        'plugin.JeremyHarris\LazyLoad.tags',
-        'plugin.JeremyHarris\LazyLoad.users',
+        'plugin.JeremyHarris\LazyLoad.Articles',
+        'plugin.JeremyHarris\LazyLoad.ArticlesTags',
+        'plugin.JeremyHarris\LazyLoad.Authors',
+        'plugin.JeremyHarris\LazyLoad.Comments',
+        'plugin.JeremyHarris\LazyLoad.Tags',
+        'plugin.JeremyHarris\LazyLoad.Users',
     ];
 
     /**
@@ -40,7 +39,7 @@ class LazyLoadEntityTraitTest extends TestCase
      *
      * @return void
      */
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
@@ -259,7 +258,7 @@ public function testEntityMethodGet()
     {
         $article = $this->Articles->get(1);
         $comments = $article->comments;
-        $this->assertInternalType('array', $comments);
+        $this->assertIsArray($comments);
         $this->assertCount(4, $comments);
         $this->assertInstanceOf(\Cake\Datasource\EntityInterface::class, $comments[0]);
     }
@@ -358,7 +357,10 @@ public function testHasArray()
      */
     public function testDontInterfereWithContain()
     {
-        $this->Articles = $this->getMockForModel('Articles', ['_lazyLoad'], ['table' => 'articles']);
+        $this->Articles = $this->getMockBuilder(ArticlesTable::class)
+            ->addMethods(['_lazyLoad'])
+            ->setConstructorArgs([['table' => 'articles']])
+            ->getMock();
         $this->Articles->belongsTo('Authors');
 
         $this->Articles