diff --git a/.travis.yml b/.travis.yml
index 3c3e1819..ef850687 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -59,11 +59,23 @@ before_script:
     ## Composer in PHP versions 5.x requires 3 GB memory
     - if [ ${TRAVIS_PHP_VERSION:0:2} == "5." ]; then export COMPOSER_MEMORY_LIMIT=3G ; fi
     - travis_wait composer install --prefer-source $(if [ -n "$DEPENDENCIES" ]; then echo $DEPENDENCIES; fi)
-    ## PHP 8 require PHPUnit 8
+    ## PHP 8 require PHPUnit 8 (ugly hack for support PHPUnit 7 and 8 together)
     - |
       if [[ ${TRAVIS_PHP_VERSION:0:2} == "8." ]] || [[ $TRAVIS_PHP_VERSION == "nightly" ]]; then
         travis_wait composer remove phpunit/phpunit --dev --no-interaction --ignore-platform-reqs
         travis_wait composer require phpunit/phpunit ^8.0 --dev --ignore-platform-reqs
+
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function setUpBeforeClass()$/function setUpBeforeClass(): void/' {} \;
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function tearDownAfterClass()$/function tearDownAfterClass(): void/' {} \;
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function setUp()$/function setUp(): void/' {} \;
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function tearDown()$/function tearDown(): void/' {} \;
+
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/->assertContains(/->assertStringContainsString(/' {} \;
+        find ./tests/ -name "*.php" -type f -exec sed -i -e 's/->assertNotContains(/->assertStringNotContainsString(/' {} \;
+        find ./tests/ -name "*.php" -type f -exec sed -i -e "s/->assertInternalType('array', /->assertIsArray(/" {} \;
+
+        sed -i "s/\$this->addWarning('The @expectedException,/\/\/\$this->addWarning('The @expectedException,/" ./vendor/phpunit/phpunit/src/Framework/TestCase.php
+        sed -i "s/self::createWarning('The optional \$delta/\/\/self::createWarning('The optional \$delta/" ./vendor/phpunit/phpunit/src/Framework/Assert.php
       fi
     ## PHPDocumentor
     ##- mkdir -p build/docs