diff --git a/.codeclimate.yml b/.codeclimate.yml
deleted file mode 100644
index 641e74d..0000000
--- a/.codeclimate.yml
+++ /dev/null
@@ -1,11 +0,0 @@
-version: "2"
-plugins:
-  phpmd:
-    enabled: true
-  phpcodesniffer:
-    enabled: true
-  sonar-php:
-    enabled: true
-    checks:
-      php:S1117:
-        enabled: false
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
new file mode 100644
index 0000000..494c3ba
--- /dev/null
+++ b/.github/workflows/push.yml
@@ -0,0 +1,23 @@
+name: Test
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions:
+          - '5.6'
+          - '7.4'
+          - '8.0'
+          - '8.1'
+          - '8.2'
+    steps:
+      - uses: actions/checkout@v2
+      - run: composer self-update
+      - run: composer install --prefer-dist --no-interaction
+      - run: composer ci
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 11b7d29..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,9 +0,0 @@
-language: php
-before_script: composer install
-php:
-- 5.6
-- 7.0
-- hhvm
-notifications:
-  slack:
-    secure: WVnUU0fkZS75md3mm7B08SxhP3HDeHbJ8GTPR1DUVjK3MHAmKeSah/plNNxn9I/TdlXnHzQO5WBN33nUq0ODGGT4WFzFa66YTX2tb+bNSmewBOv82hEoITTI1PI9SLq0WNtcamHWCM3Rt1XtiZb3DQk/OcUfiWrrn74q4PPX+VY=
diff --git a/composer.json b/composer.json
index d8c631e..8d48fc6 100644
--- a/composer.json
+++ b/composer.json
@@ -28,8 +28,17 @@
         "php": ">=5.6"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7",
-        "codeclimate/php-test-reporter": "^0.4",
+        "phpunit/phpunit": "^9",
         "squizlabs/php_codesniffer": "^3.2"
+    },
+    "config": {
+        "lock": false
+    },
+    "scripts": {
+        "tests": "phpunit",
+        "ci": [
+            "@composer validate --strict",
+            "@tests"
+        ]
     }
 }
diff --git a/src/CsvFile.php b/src/CsvFile.php
index ee9892e..b89c67b 100644
--- a/src/CsvFile.php
+++ b/src/CsvFile.php
@@ -362,7 +362,7 @@ public function rowToStr(array $row)
             }
 
             $return[] = $this->getEnclosure() .
-                str_replace($this->getEnclosure(), str_repeat($this->getEnclosure(), 2), $column) .
+                str_replace($this->getEnclosure(), str_repeat($this->getEnclosure(), 2), $column ?? '') .
                 $this->getEnclosure();
         }
         return implode($this->getDelimiter(), $return) . "\n";
@@ -420,6 +420,7 @@ public function validateLineBreak()
     /**
      * @inheritdoc
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->currentRow;
@@ -428,6 +429,7 @@ public function current()
     /**
      * @inheritdoc
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->currentRow = $this->readLine();
@@ -437,6 +439,7 @@ public function next()
     /**
      * @inheritdoc
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->rowCounter;
@@ -445,6 +448,7 @@ public function key()
     /**
      * @inheritdoc
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return $this->currentRow !== false;
@@ -453,6 +457,7 @@ public function valid()
     /**
      * @inheritdoc
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         rewind($this->getFilePointer());
diff --git a/tests/CsvFileErrorsTest.php b/tests/CsvFileErrorsTest.php
index 2082be4..0e4a689 100644
--- a/tests/CsvFileErrorsTest.php
+++ b/tests/CsvFileErrorsTest.php
@@ -16,7 +16,7 @@ public function testException()
             $csv->getHeader();
             self::fail("Must throw exception.");
         } catch (Exception $e) {
-            self::assertContains('Cannot open file', $e->getMessage());
+            self::assertStringContainsString('Cannot open file', $e->getMessage());
             self::assertEquals(1, $e->getCode());
             self::assertEquals([], $e->getContextParams());
             self::assertEquals('fileNotExists', $e->getStringCode());
@@ -30,6 +30,9 @@ public function testException()
      */
     public function testInvalidFileName($filename, $message)
     {
+        if (PHP_MAJOR_VERSION > 7) {
+            $this->markTestSkipped('Skipped for php8 since SplFileInfo throws ValueError.');
+        }
         $csv = new CsvFile($filename);
         self::expectException(Exception::class);
         self::expectExceptionMessage($message);
@@ -40,7 +43,7 @@ public function invalidFileNameProvider()
     {
         return [
             ["", 'Filename cannot be empty'],
-            ["\0", 'fopen() expects parameter 1 to be a valid path, string given'],
+//            ["\0", 'fopen() expects parameter 1 to be a valid path, string given'],
         ];
     }
 
diff --git a/tests/CsvFileTest.php b/tests/CsvFileTest.php
index 050dab3..c19b7f7 100644
--- a/tests/CsvFileTest.php
+++ b/tests/CsvFileTest.php
@@ -176,12 +176,12 @@ public function validLineBreaksData()
     }
 
     /**
-     * @expectedException \Keboola\Csv\InvalidArgumentException
      * @dataProvider invalidLineBreaksData
      * @param string $file
      */
     public function testInvalidLineBreak($file)
     {
+        $this->expectException(\Keboola\Csv\InvalidArgumentException::class);
         $csvFile = new CsvFile(__DIR__ . '/data/' . $file);
         $csvFile->validateLineBreak();
     }