diff --git a/tests/codeigniter/core/Loader_test.php b/tests/codeigniter/core/Loader_test.php
index 0308d95fe8..d76e820346 100644
--- a/tests/codeigniter/core/Loader_test.php
+++ b/tests/codeigniter/core/Loader_test.php
@@ -4,6 +4,8 @@ class Loader_test extends CI_TestCase {
 
 	private $ci_obj;
 
+	private $realAssertObjectHasProperty;
+
 	public function set_up()
 	{
 		// Instantiate a new loader
@@ -16,6 +18,12 @@ public function set_up()
 		// Set subclass prefix
 		$this->prefix = 'MY_';
 		$this->ci_set_config('subclass_prefix', $this->prefix);
+
+		// assertObjectHasAttribute() is deprecated and will be removed in PHPUnit 10.
+		// It was replaced by assertObjectHasProperty() in phpunit 10.1.0+
+		$this->realAssertObjectHasProperty = method_exists($this, 'assertObjectHasProperty')
+			? 'assertObjectHasProperty'
+			: 'assertObjectHasAttribute';
 	}
 
 	// --------------------------------------------------------------------
@@ -36,7 +44,7 @@ public function test_library()
 		// Test loading as an array.
 		$this->assertInstanceOf('CI_Loader', $this->load->library(array($lib)));
 		$this->assertTrue(class_exists($class), $class.' does not exist');
-		$this->assertObjectHasAttribute($lib, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($lib, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$lib);
 
 		// Create library in VFS
@@ -88,21 +96,21 @@ public function test_library_extension()
 		$this->assertInstanceOf('CI_Loader', $this->load->library($lib));
 		$this->assertTrue(class_exists($class), $class.' does not exist');
 		$this->assertTrue(class_exists($ext), $ext.' does not exist');
-		$this->assertObjectHasAttribute($name, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($name, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$name);
 		$this->assertInstanceOf($ext, $this->ci_obj->$name);
 
 		// Test reloading with object name
 		$obj = 'exttest';
 		$this->assertInstanceOf('CI_Loader', $this->load->library($lib, NULL, $obj));
-		$this->assertObjectHasAttribute($obj, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($obj, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$obj);
 		$this->assertInstanceOf($ext, $this->ci_obj->$obj);
 
 		// Test reloading
 		unset($this->ci_obj->$name);
 		$this->assertInstanceOf('CI_Loader', $this->load->library($lib));
-		$this->assertObjectHasAttribute($name, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($name, $this->ci_obj));
 
 		// Create baseless library
 		$name = 'ext_baseless_lib';
@@ -140,7 +148,7 @@ public function test_library_config()
 		$obj = 'testy';
 		$this->assertInstanceOf('CI_Loader', $this->load->library($lib, NULL, $obj));
 		$this->assertTrue(class_exists($class), $class.' does not exist');
-		$this->assertObjectHasAttribute($obj, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($obj, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$obj);
 		$this->assertEquals($cfg, $this->ci_obj->$obj->config);
 
@@ -172,7 +180,7 @@ public function test_load_library_in_application_dir()
 
 		// Was the model class instantiated.
 		$this->assertTrue(class_exists($class), $class.' does not exist');
-		$this->assertObjectHasAttribute($lib, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($lib, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$lib);
 	}
 
@@ -193,13 +201,13 @@ class_exists('CI_Driver_Library', TRUE);
 		// Test loading as an array.
 		$this->assertInstanceOf('CI_Loader', $this->load->driver(array($driver)));
 		$this->assertTrue(class_exists($class), $class.' does not exist');
-		$this->assertObjectHasAttribute($driver, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($driver, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$driver);
 
 		// Test loading as a library with a name
 		$obj = 'testdrive';
 		$this->assertInstanceOf('CI_Loader', $this->load->library($driver, NULL, $obj));
-		$this->assertObjectHasAttribute($obj, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($obj, $this->ci_obj));
 		$this->assertInstanceOf($class, $this->ci_obj->$obj);
 
 		// Test a string given to params
@@ -222,7 +230,7 @@ public function test_models()
 
 		// Was the model class instantiated.
 		$this->assertTrue(class_exists($model));
-		$this->assertObjectHasAttribute($model, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($model, $this->ci_obj));
 
 		// Test no model given
 		$this->assertInstanceOf('CI_Loader', $this->load->model(''));
@@ -248,8 +256,8 @@ public function test_model_subdir()
 
 		// Was the model class instantiated?
 		$this->assertTrue(class_exists($model));
-		$this->assertObjectHasAttribute($name, $this->ci_obj);
-		$this->assertObjectHasAttribute($name, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($name, $this->ci_obj));
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($name, $this->ci_obj));
 		$this->assertInstanceOf($base, $this->ci_obj->$name);
 		$this->assertInstanceOf($model, $this->ci_obj->$name);
 
@@ -607,17 +615,17 @@ public function test_initialize()
 
 		// Verify library
 		$this->assertTrue(class_exists($lib_class), $lib_class.' does not exist');
-		$this->assertObjectHasAttribute($lib, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($lib, $this->ci_obj));
 		$this->assertInstanceOf($lib_class, $this->ci_obj->$lib);
 
 		// Verify driver
 		$this->assertTrue(class_exists($drv_class), $drv_class.' does not exist');
-		$this->assertObjectHasAttribute($drv, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($drv, $this->ci_obj));
 		$this->assertInstanceOf($drv_class, $this->ci_obj->$drv);
 
 		// Verify model
 		$this->assertTrue(class_exists($model), $model.' does not exist');
-		$this->assertObjectHasAttribute($model, $this->ci_obj);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($model, $this->ci_obj));
 		$this->assertInstanceOf($model, $this->ci_obj->$model);
 
 		// Verify config calls
diff --git a/tests/codeigniter/libraries/Driver_test.php b/tests/codeigniter/libraries/Driver_test.php
index 406092a7a9..d132418a80 100644
--- a/tests/codeigniter/libraries/Driver_test.php
+++ b/tests/codeigniter/libraries/Driver_test.php
@@ -7,6 +7,8 @@ class Driver_test extends CI_TestCase {
 
 	private $name;
 
+	private $realAssertObjectHasProperty;
+
 	/**
 	 * Set up test framework
 	 */
@@ -25,6 +27,12 @@ public function set_up()
 		// Create mock driver library
 		$this->name = 'Driver';
 		$this->lib = new Mock_Libraries_Driver();
+
+		// assertObjectHasAttribute() is deprecated and will be removed in PHPUnit 10.
+		// It was replaced by assertObjectHasProperty() in phpunit 10.1.0+
+		$this->realAssertObjectHasProperty = method_exists($this, 'assertObjectHasProperty')
+			? 'assertObjectHasProperty'
+			: 'assertObjectHasAttribute';
 	}
 
 	/**
@@ -51,12 +59,12 @@ public function test_load_driver()
 		$this->assertEquals($this->name, $this->lib->get_name());
 
 		// Was driver loaded?
-		$this->assertObjectHasAttribute($driver, $this->lib);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($driver, $this->lib));
 		$this->assertInstanceOf($class, $this->lib->$driver);
 		$this->assertInstanceOf('CI_Driver', $this->lib->$driver);
 
 		// Was decorate called?
-		$this->assertObjectHasAttribute($prop, $this->lib->$driver);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($prop, $this->lib->$driver));
 		$this->assertTrue($this->lib->$driver->$prop);
 
 		// Do we get an error for an invalid driver?
@@ -86,7 +94,8 @@ public function test_load_app_driver()
 		$this->assertNotNull($this->lib->load_driver($driver));
 
 		// Was driver loaded?
-		$this->assertObjectHasAttribute($driver, $this->lib);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($driver, $this->lib));
+
 		$this->assertInstanceOf($class, $this->lib->$driver);
 		$this->assertInstanceOf('CI_Driver', $this->lib->$driver);
 
@@ -120,7 +129,7 @@ public function test_load_driver_ext()
 		$this->assertNotNull($this->lib->load_driver($driver));
 
 		// Was driver loaded?
-		$this->assertObjectHasAttribute($driver, $this->lib);
+		call_user_func_array(array($this, $this->realAssertObjectHasProperty), array($driver, $this->lib));
 		$this->assertInstanceOf($class, $this->lib->$driver);
 		$this->assertInstanceOf($baseclass, $this->lib->$driver);
 		$this->assertInstanceOf('CI_Driver', $this->lib->$driver);