diff --git a/tests/CheckDomainTest.php b/tests/CheckDomainTest.php
index 29956a72..845eb155 100644
--- a/tests/CheckDomainTest.php
+++ b/tests/CheckDomainTest.php
@@ -10,7 +10,7 @@ class CheckDomainTest extends \PHPUnit\Framework\TestCase
     {
         $this->assertEquals('', check_domain('example.com'));
         $this->assertEquals('', check_domain('google.com'));
-        $this->assertRegExp('/ not discoverable in DNS/', check_domain('fishbeansblahblahblah' . uniqid() . '.com'));
+        $this->assertMatchesRegularExpression('/ not discoverable in DNS/', check_domain('fishbeansblahblahblah' . uniqid() . '.com'));
     }
 }
 
diff --git a/tests/CheckEmailTest.php b/tests/CheckEmailTest.php
index 9d3c3161..5c543176 100644
--- a/tests/CheckEmailTest.php
+++ b/tests/CheckEmailTest.php
@@ -8,7 +8,7 @@ class CheckEmailTest extends \PHPUnit\Framework\TestCase
     public function testBasic()
     {
         $this->assertEquals('', check_email('test@example.com'));
-        $this->assertRegExp('/ not discoverable in DNS/', check_email('test@fishbeansblahblahblah' . uniqid() . '.com'));
+        $this->assertMatchesRegularExpression('/ not discoverable in DNS/', check_email('test@fishbeansblahblahblah' . uniqid() . '.com'));
     }
 }
 
diff --git a/tests/CreatePageBrowserTest.php b/tests/CreatePageBrowserTest.php
index 70cd4feb..3a4aa405 100644
--- a/tests/CreatePageBrowserTest.php
+++ b/tests/CreatePageBrowserTest.php
@@ -43,7 +43,7 @@ class CreatePageBrowserTest extends \PHPUnit\Framework\TestCase
         $b = create_page_browser('mailbox.username', 'FROM mailbox WHERE 1 = 1');
         $this->assertEquals(10, sizeof($b));
         foreach ($b as $range) {
-            $this->assertRegExp('/[\w]{2}\-[\w]{2}/', $range);
+            $this->assertMatchesRegularExpression('/[\w]{2}\-[\w]{2}/', $range);
         }
         $this->assertNotEmpty($b);
     }
diff --git a/tests/PacryptTest.php b/tests/PacryptTest.php
index f63b4a24..aac8be39 100644
--- a/tests/PacryptTest.php
+++ b/tests/PacryptTest.php
@@ -170,7 +170,7 @@ class PaCryptTest extends \PHPUnit\Framework\TestCase
 
         $this->assertEquals($enc, _pacrypt_php_crypt($password, $enc));
 
-        $this->assertRegExp('/^\{SHA256-CRYPT\}/', $enc);
+        $this->assertMatchesRegularExpression('/^\{SHA256-CRYPT\}/', $enc);
         $this->assertGreaterThan(20, strlen($enc));
     }
 
@@ -303,7 +303,7 @@ class PaCryptTest extends \PHPUnit\Framework\TestCase
 
         $x = pacrypt('test123');
 
-        $this->assertRegExp('/^\{SHA512-CRYPT\.B64/', $x);
+        $this->assertMatchesRegularExpression('/^\{SHA512-CRYPT\.B64/', $x);
         $this->assertTrue(strlen($x) > 50);
 
         $this->assertEquals($x, pacrypt('test123', $x));