diff --git a/.travis.yml b/.travis.yml
index d78e98f8b4c..adccfa91c9c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,10 +63,10 @@ matrix:
       sudo: false
       addons: false
     # All tests after another
-    - php: 7
+    - php: 7.3
       env: TEST_SUITE=AllTests MYSQL_ADAPTER=MYSQLI ALLTEST_EXTRA_OPTIONS="--run-first-half-only"
       sudo: required
-    - php: 7
+    - php: 7.3
       env: TEST_SUITE=AllTests MYSQL_ADAPTER=MYSQLI ALLTEST_EXTRA_OPTIONS="--run-second-half-only"
       sudo: required
     # UITests use a specific version because the default 5.5 (== 5.5.38) is missing FreeType support
diff --git a/plugins/API/tests/Unit/HtmlRendererTest.php b/plugins/API/tests/Unit/HtmlRendererTest.php
index d1370432ffb..098f9395cc0 100644
--- a/plugins/API/tests/Unit/HtmlRendererTest.php
+++ b/plugins/API/tests/Unit/HtmlRendererTest.php
@@ -275,6 +275,10 @@ public function test_renderDataTable_shouldRenderDataTableWithComplexMetadata()
 
         $response = $this->builder->renderDataTable($dataTable);
 
+        $stdClass = version_compare(PHP_VERSION, 7.3, '>=') ?
+            "(object) array(\n  )," :
+            "stdClass::__set_state(array(\n  )),";
+
         $this->assertEquals('<table id="MultiSites_getAll" border="1">
 <thead>
 	<tr>
@@ -292,8 +296,7 @@ public function test_renderDataTable_shouldRenderDataTableWithComplexMetadata()
   Piwik\Plugins\CoreHome\Columns\Metrics\AverageTimeOnSite::__set_state(array(
   )),
   1 =&gt; 
-  stdClass::__set_state(array(
-  )),
+  ' . $stdClass . '
   2 =&gt; 
   Piwik\Date::__set_state(array(
      \'timestamp\' =&gt; 1451606400,
diff --git a/tests/PHPUnit/Integration/EmailValidatorTest.php b/tests/PHPUnit/Integration/EmailValidatorTest.php
index 8cb0c198c07..4a4665f2d6a 100644
--- a/tests/PHPUnit/Integration/EmailValidatorTest.php
+++ b/tests/PHPUnit/Integration/EmailValidatorTest.php
@@ -60,7 +60,7 @@ public function test_allCurrentTlds()
             if (strpos(mb_strtolower($tld), 'xn--') !== 0) {
                 $tld = mb_strtolower($tld);
             }
-            $domainNameExtension = idn_to_utf8($tld);
+            $domainNameExtension = idn_to_utf8($tld, 0, INTL_IDNA_VARIANT_UTS46);
             $email = 'test@example.' . $domainNameExtension;
 
             if(!$this->isValid($email)) {
@@ -101,7 +101,7 @@ public function test_invalidTld()
                 $tld = mb_strtolower($tld);
             }
             $this->assertFalse(
-                $this->isValid('test@example.' . idn_to_utf8($tld))
+                $this->isValid('test@example.' . idn_to_utf8($tld, 0, INTL_IDNA_VARIANT_UTS46))
             );
         }
     }