diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..059c79a
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,60 @@
+name: CI build
+on: [ push, pull_request ]
+jobs:
+    build:
+        name: PHP ${{ matrix.php-versions }} on ${{ matrix.operating-system }} ${{ matrix.extra-label }} ${{ matrix.composer-dependencies }}
+        runs-on: ${{ matrix.operating-system }}
+        strategy:
+            fail-fast: false
+            matrix:
+                operating-system: [ ubuntu-latest ]
+                php-versions: [ '8.0' ]
+                composer-dependencies: [ '', '--prefer-lowest' ]
+                symfony-version: [ '' ]
+                extra-label: [ '' ]
+                include:
+
+                    # Windows
+                    -   php-versions: '8.0'
+                        operating-system: windows-latest
+                        coverage: xdebug
+
+        steps:
+            # see https://github.com/actions/checkout/issues/226#issue-606867805
+            -   name: Prepare git
+                run: git config --global core.autocrlf false
+
+            -   name: Checkout
+                uses: actions/checkout@v2
+
+            -   name: Setup PHP, with composer and extensions
+                uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+                with:
+                    php-version: ${{ matrix.php-versions }}
+                    ini-values: memory_limit=-1
+                    tools: composer:${{ matrix.composer-version }}
+                    coverage: ${{ matrix.coverage }}
+
+            -   name: Get composer cache directory
+                id: composer-cache
+                run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            -   name: Cache dependencies
+                uses: actions/cache@v2
+                with:
+                    path: ${{ steps.composer-cache.outputs.dir }}
+                    key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+                    restore-keys: ${{ runner.os }}-composer-
+
+            -   name: Install Composer dependencies
+                run: composer update --no-progress --prefer-dist --optimize-autoloader ${{ matrix.composer-dependencies }}
+
+            -   name: Run Build
+                run: composer run build
+
+            - name: Upload coverage results to Coveralls
+              env:
+                  COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              run: |
+                  composer global require php-coveralls/php-coveralls --no-progress --prefer-dist --optimize-autoloader
+                  php-coveralls --coverage_clover=build/logs/clover.xml -v
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index c313138..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-language: php
-
-php:
-  - 7.4
-  - 8.0
-
-jobs:
-  allow_failures:
-    - php: 8.0
-
-env:
-  global:
-    - XDEBUG_MODE=coverage
-  matrix:
-    - PREFER_LOWEST="--prefer-lowest --prefer-stable"
-    - PREFER_LOWEST=""
-
-before_script:
-  - composer update $PREFER_LOWEST
-
-script:
-  - composer run build
-
-after_success:
-  - travis_retry php vendor/bin/php-coveralls -v
diff --git a/README.md b/README.md
index 8d6c95b..b80be35 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,9 @@ Author
 Changelog
 ----------
 
+## 3.4.0 (2021-??-??)
+- [#15](../../pull/15) Drop support for PHP < 8.0
+
 ## 3.3.0 (2020-12-31)
 - [#12](../../pull/12) Drop support for PHP < 7.4
 - [#11](../../pull/11) Add support for PHP 8.0 (thank you @ahilles107!)
diff --git a/composer.json b/composer.json
index f085f0a..a31330a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,15 +17,15 @@
 		}
 	],
 	"require": {
-		"php": "~7.4 | ~8.0",
-		"jms/serializer": "~3.2",
+		"php": "~8.0",
+		"jms/serializer": "~3.14",
 		"ramsey/uuid": "~3.0|~4.0"
 	},
 	"require-dev": {
-		"consistence/coding-standard": "3.10.1",
-		"php-parallel-lint/php-parallel-lint": "1.2.0",
-		"php-coveralls/php-coveralls": "2.4.1",
-		"phpunit/phpunit": "9.5.0"
+		"consistence-community/coding-standard": "3.11.1",
+		"php-parallel-lint/php-parallel-lint": "1.3.1",
+		"php-coveralls/php-coveralls": "2.4.3",
+		"phpunit/phpunit": "9.5.10"
 	},
 	"autoload": {
 		"psr-4": { "Mhujer\\JmsSerializer\\": [ "src" ] },
@@ -43,7 +43,7 @@
 		],
 		"coveralls": "coveralls -v",
 		"lint": "parallel-lint src tests",
-		"phpcs": "phpcs --standard=vendor/consistence/coding-standard/Consistence/ruleset.xml src tests",
+		"phpcs": "phpcs --standard=vendor/consistence-community/coding-standard/Consistence/ruleset.xml src tests",
 		"test": "phpunit"
 	}
 }
diff --git a/src/Uuid/UuidSerializerHandler.php b/src/Uuid/UuidSerializerHandler.php
index 6c914b5..1516492 100644
--- a/src/Uuid/UuidSerializerHandler.php
+++ b/src/Uuid/UuidSerializerHandler.php
@@ -55,7 +55,7 @@ public static function getSubscribingMethods(): array
 	 * @param \JMS\Serializer\Context $context
 	 * @return \Ramsey\Uuid\UuidInterface
 	 */
-	public function deserializeUuid(DeserializationVisitorInterface $visitor, $data, array $type, Context $context): UuidInterface
+	public function deserializeUuid(DeserializationVisitorInterface $visitor, $data, array $type, Context $context): UuidInterface // phpcs:ignore
 	{
 		try {
 			return $this->deserializeUuidValue((string) $data);
@@ -81,7 +81,7 @@ private function deserializeUuidValue(string $uuidString): UuidInterface
 	 * @param mixed[] $type
 	 * @return string|object
 	 */
-	public function serializeUuid(SerializationVisitorInterface $visitor, UuidInterface $uuid, array $type)
+	public function serializeUuid(SerializationVisitorInterface $visitor, UuidInterface $uuid, array $type): mixed
 	{
 		return $visitor->visitString($uuid->toString(), $type);
 	}