diff --git a/.gitattributes b/.gitattributes
index 2630454..5b41632 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,9 +1,8 @@
+/.github export-ignore
 /tests export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
 .php_cs export-ignore
-.scrutinizer.yml export-ignore
-.travis.run-tests.sh export-ignore
-.travis.yml export-ignore
+Makefile export-ignore
 phpstan.neon export-ignore
 phpunit.xml export-ignore
diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
new file mode 100644
index 0000000..97b2a7e
--- /dev/null
+++ b/.github/workflows/integrate.yaml
@@ -0,0 +1,215 @@
+name: "Integrate"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  composer-json-lint:
+    name: "Lint composer.json"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          tools: composer-normalize, composer-require-checker, composer-unused
+
+      - name: "Get composer cache directory"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Validate composer.json"
+        run: "composer validate --strict"
+
+      - name: "Normalize composer.json"
+        run: "composer-normalize --dry-run"
+
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+          - "8.0"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: zend.assertions=1
+
+      - name: "Get composer cache directory"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install dependencies"
+        if: ${{ matrix.php-version != '8.0' }}
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Install dependencies PHP 8.0"
+        if: ${{ matrix.php-version == '8.0' }}
+        run: "composer update --no-interaction --no-progress --ignore-platform-reqs"
+
+      - name: "Run tests"
+        timeout-minutes: 3
+        run: "vendor/bin/phpunit --no-coverage --no-logging"
+
+  code-coverage:
+    name: "Code Coverage"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "pcov"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: zend.assertions=1
+
+      - name: "Get composer cache directory"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Run tests"
+        timeout-minutes: 3
+        run: "vendor/bin/phpunit --coverage-clover=coverage.xml"
+
+      - name: "Send code coverage report to Codecov.io"
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
+          fail_ci_if_error: true
+
+  coding-standards:
+    name: "Coding Standards"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: "Get composer cache directory"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Check coding standards"
+        run: "vendor/bin/php-cs-fixer fix --verbose --dry-run --diff"
+
+  static-analysis:
+    name: "Static Analysis"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          tools: cs2pr
+
+      - name: "Get composer cache directory"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Run static analysis"
+        run: "vendor/bin/phpstan analyse --no-progress --error-format=checkstyle | cs2pr"
diff --git a/.php_cs b/.php_cs
index e171c6c..c75dfc3 100644
--- a/.php_cs
+++ b/.php_cs
@@ -1,6 +1,6 @@
 <?php
 
-$config = new SlamCsFixer\Config(SlamCsFixer\Config::LIB);
+$config = new SlamCsFixer\Config();
 $config->getFinder()
     ->in(__DIR__ . '/lib/Exception')
     ->in(__DIR__ . '/lib/Helper')
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7aaa153
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+all: csfix static-analysis test
+	@echo "Done."
+
+vendor: composer.json
+	composer update
+	touch vendor
+
+.PHONY: csfix
+csfix: vendor
+	vendor/bin/php-cs-fixer fix --verbose
+
+.PHONY: static-analysis
+static-analysis: vendor
+	vendor/bin/phpstan analyse
+
+.PHONY: test
+test: vendor
+	php -d zend.assertions=1 vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index 87e07af..103d02c 100644
--- a/composer.json
+++ b/composer.json
@@ -10,19 +10,18 @@
         }
     ],
     "require": {
-        "php": "^7.3"
+        "php": "^7.4 || ^8.0"
     },
     "require-dev": {
-        "mikey179/vfsstream": "^1.6",
-        "phpoffice/phpspreadsheet": "^1.10",
-        "phpstan/phpstan": "^0.12",
-        "phpstan/phpstan-phpunit": "^0.12",
-        "phpunit/phpunit": "^8.5",
-        "roave/security-advisories": "dev-master",
-        "slam/php-cs-fixer-extensions": "^1.19",
-        "slam/php-debug-r": "^1.6",
-        "slam/phpstan-extensions": "^4.0",
-        "thecodingmachine/phpstan-strict-rules": "^0.12"
+        "mikey179/vfsstream": "^1.6.8",
+        "phpoffice/phpspreadsheet": "^1.15.0",
+        "phpstan/phpstan": "^0.12.50",
+        "phpstan/phpstan-phpunit": "^0.12.16",
+        "phpunit/phpunit": "^9.4.2",
+        "slam/php-cs-fixer-extensions": "^2.0.0",
+        "slam/php-debug-r": "^1.6.1",
+        "slam/phpstan-extensions": "^5.0.2",
+        "thecodingmachine/phpstan-strict-rules": "^0.12.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/lib/Helper/Column.php b/lib/Helper/Column.php
index e7e20a4..683f208 100644
--- a/lib/Helper/Column.php
+++ b/lib/Helper/Column.php
@@ -6,25 +6,10 @@
 
 final class Column implements ColumnInterface
 {
-    /**
-     * @var string
-     */
-    private $key;
-
-    /**
-     * @var string
-     */
-    private $heading;
-
-    /**
-     * @var int
-     */
-    private $width;
-
-    /**
-     * @var CellStyleInterface
-     */
-    private $cellStyle;
+    private string $key;
+    private string $heading;
+    private int $width;
+    private CellStyleInterface $cellStyle;
 
     public function __construct(string $key, string $heading, int $width, CellStyleInterface $cellStyle)
     {
diff --git a/lib/Helper/ColumnCollection.php b/lib/Helper/ColumnCollection.php
index caddafb..ca9c1c4 100644
--- a/lib/Helper/ColumnCollection.php
+++ b/lib/Helper/ColumnCollection.php
@@ -11,7 +11,7 @@ final class ColumnCollection implements ColumnCollectionInterface
     /**
      * @var array<string, ColumnInterface>
      */
-    private $columns = [];
+    private array $columns = [];
 
     public function __construct(array $columns)
     {
@@ -29,17 +29,15 @@ private function addColumn(ColumnInterface $column): void
      * @param string $offset
      * @param mixed  $value
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         throw new Exception\RuntimeException('Collection not editable');
     }
 
     /**
      * @param string $offset
-     *
-     * @return bool
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->columns[$offset]);
     }
@@ -47,17 +45,15 @@ public function offsetExists($offset)
     /**
      * @param string $offset
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         throw new Exception\RuntimeException('Collection not editable');
     }
 
     /**
      * @param string $offset
-     *
-     * @return null|mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): ?ColumnInterface
     {
         return $this->columns[$offset] ?? null;
     }
diff --git a/lib/Helper/ColumnCollectionInterface.php b/lib/Helper/ColumnCollectionInterface.php
index dc218a6..e8614b1 100644
--- a/lib/Helper/ColumnCollectionInterface.php
+++ b/lib/Helper/ColumnCollectionInterface.php
@@ -6,6 +6,9 @@
 
 use ArrayAccess;
 
+/**
+ * @extends ArrayAccess<string, ColumnInterface>
+ */
 interface ColumnCollectionInterface extends ArrayAccess
 {
 }
diff --git a/lib/Helper/Table.php b/lib/Helper/Table.php
index 8186a18..7fcf62b 100644
--- a/lib/Helper/Table.php
+++ b/lib/Helper/Table.php
@@ -11,90 +11,23 @@
 
 final class Table implements Countable
 {
-    /**
-     * @var Worksheet
-     */
-    private $activeSheet;
-
-    /**
-     * @var null|int
-     */
-    private $dataRowStart;
-
-    /**
-     * @var int
-     */
-    private $rowStart;
-
-    /**
-     * @var int
-     */
-    private $rowEnd;
-
-    /**
-     * @var int
-     */
-    private $rowCurrent;
-
-    /**
-     * @var int
-     */
-    private $columnStart;
-
-    /**
-     * @var int
-     */
-    private $columnEnd;
-
-    /**
-     * @var int
-     */
-    private $columnCurrent;
-
-    /**
-     * @var string
-     */
-    private $heading;
-
-    /**
-     * @var Iterator
-     */
-    private $data;
-
-    /**
-     * @var null|ColumnCollectionInterface
-     */
-    private $columnCollection;
-
-    /**
-     * @var bool
-     */
-    private $freezePanes = true;
-
-    /**
-     * @var int
-     */
-    private $fontSize = 8;
-
-    /**
-     * @var null|int
-     */
-    private $rowHeight;
-
-    /**
-     * @var bool
-     */
-    private $textWrap = false;
-
-    /**
-     * @var null|array
-     */
-    private $writtenColumnTitles;
-
-    /**
-     * @var null|int
-     */
-    private $count;
+    private Worksheet $activeSheet;
+    private ?int $dataRowStart = null;
+    private int $rowStart;
+    private int $rowEnd;
+    private int $rowCurrent;
+    private int $columnStart;
+    private int $columnEnd;
+    private int $columnCurrent;
+    private string $heading;
+    private Iterator $data;
+    private ?ColumnCollectionInterface $columnCollection = null;
+    private bool $freezePanes                            = true;
+    private int $fontSize                                = 8;
+    private ?int $rowHeight                              = null;
+    private bool $textWrap                               = false;
+    private ?array $writtenColumnTitles                  = null;
+    private ?int $count                                  = null;
 
     public function __construct(Worksheet $activeSheet, int $row, int $column, string $heading, Iterator $data)
     {
diff --git a/lib/Helper/TableWorkbook.php b/lib/Helper/TableWorkbook.php
index 76a7770..bf9650b 100644
--- a/lib/Helper/TableWorkbook.php
+++ b/lib/Helper/TableWorkbook.php
@@ -11,25 +11,10 @@ final class TableWorkbook extends Excel\Pear\Writer\Workbook
     public const GREY_MEDIUM   = 43;
     public const GREY_LIGHT    = 42;
 
-    /**
-     * @var int
-     */
-    private $rowsPerSheet = 60000;
-
-    /**
-     * @var string
-     */
-    private $emptyTableMessage = '';
-
-    /**
-     * @var CellStyle\Text
-     */
-    private $styleIdentity;
-
-    /**
-     * @var null|array
-     */
-    private $formats;
+    private int $rowsPerSheet         = 60000;
+    private string $emptyTableMessage = '';
+    private CellStyle\Text $styleIdentity;
+    private ?array $formats;
 
     public function __construct(string $filename)
     {
@@ -156,9 +141,9 @@ private function writeColumnsHeading(Table $table, array $row): void
             $width    = 10;
             $newTitle = \ucwords(\str_replace('_', ' ', $title));
 
-            if (isset($columnCollection) && isset($columnCollection[$title])) {
-                $width    = $columnCollection[$title]->getWidth();
-                $newTitle = $columnCollection[$title]->getHeading();
+            if (null !== $columnCollection && null !== ($column = $columnCollection[$title])) {
+                $width    = $column->getWidth();
+                $newTitle = $column->getHeading();
             }
 
             $table->getActiveSheet()->setColumn($table->getColumnCurrent(), $table->getColumnCurrent(), $width);
diff --git a/phpstan.neon b/phpstan.neon
index 6317caa..e239dd7 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -5,7 +5,6 @@ includes:
     - vendor/slam/phpstan-extensions/conf/thecodingmachine-rules.neon
 
 parameters:
-    checkGenericClassInNonGenericObjectType: false
     checkMissingIterableValueType: false
     paths:
         - lib/
@@ -13,9 +12,6 @@ parameters:
     excludes_analyse:
         - %currentWorkingDirectory%/lib/Pear/*
     ignoreErrors:
-        -
-            message: '#Method Slam\\Excel\\Helper\\ColumnCollection::offset.+ has no return typehint specified#'
-            path: %currentWorkingDirectory%/lib/Helper/ColumnCollection.php
         -
             message: '#Cannot call method \w+\(\) on PhpOffice\\PhpSpreadsheet\\Cell\\Cell\|null#'
             path: %currentWorkingDirectory%/tests/Helper/TableWorkbookTest.php
diff --git a/phpunit.xml b/phpunit.xml
index 9ff6949..f5398cf 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,16 +1,20 @@
+<?xml version="1.0"?>
 <phpunit
-    bootstrap="./vendor/autoload.php"
-    backupGlobals="false"
-    backupStaticAttributes="false"
-    colors="true"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+        bootstrap="./vendor/autoload.php"
+        colors="true"
+        verbose="true"
 >
-    <testsuite name="Excel">
-        <directory>./tests</directory>
-    </testsuite>
-
-    <filter>
-        <whitelist>
-            <directory suffix=".php">./lib</directory>
-        </whitelist>
-    </filter>
+  <coverage>
+    <include>
+      <directory suffix=".php">./lib</directory>
+    </include>
+    <report>
+      <text outputFile="php://stdout" showOnlySummary="true"/>
+    </report>
+  </coverage>
+  <testsuite name="Excel">
+    <directory>./tests</directory>
+  </testsuite>
 </phpunit>
diff --git a/tests/Helper/TableTest.php b/tests/Helper/TableTest.php
index ece053e..52fee65 100644
--- a/tests/Helper/TableTest.php
+++ b/tests/Helper/TableTest.php
@@ -21,7 +21,7 @@ final class TableTest extends TestCase
     private $activeSheet;
 
     /**
-     * @var ArrayIterator
+     * @var ArrayIterator<int, string>
      */
     private $data;