diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..5508cdc
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,62 @@
+name: CI
+
+on: push
+
+jobs:
+  php-tests:
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        experimental: [false]
+        php:
+          - 7.4
+          - 8.0
+          - 8.1
+          - 8.2
+          - 8.3
+          - 8.4
+          - 8.5
+        include:
+          - php: 8.6
+            prefer: stable
+            experimental: true
+        prefer:
+          - lowest
+          - stable
+      fail-fast: false
+
+    name: Test on PHP ${{ matrix.php }} with ${{ matrix.prefer }} composer prefer option
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Check PHP Version
+        run: php -v
+
+      - name: Xdebug Action
+        uses: MilesChou/docker-xdebug@master
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v4
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}-${{ matrix.prefer }}-
+          restore-keys: |
+            ${{ runner.os }}-php-${{ matrix.php }}-composer-${{ matrix.prefer }}-
+      - name: Install dependencies
+        if: steps.composer-cache.outputs.cache-hit != 'true'
+        run: composer update --prefer-${{ matrix.prefer }} --prefer-dist --no-progress
+
+      - name: Run tests
+        run: vendor/bin/phpunit --coverage-clover=coverage.xml
+
+      - name: Upload coverage
+        run: bash <(curl -s https://codecov.io/bash)
diff --git a/Dockerfile b/Dockerfile
index e12294c..ee7a471 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
-FROM php:8.3-cli
+ARG PHP_VERSION=8.4
+
+FROM php:${PHP_VERSION}-cli
 
 # Composer requirements begin
 RUN apt-get update \
@@ -8,7 +10,7 @@ RUN apt-get update \
 
 RUN docker-php-ext-install zip
 
-RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer
 
 # Composer requirements end
 
diff --git a/Makefile b/Makefile
index 33194be..07c98e7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 PATH := $(shell pwd)/bin:$(PATH)
-$(shell cp --update=none dev.env .env)
+$(shell cp -n dev.env .env)
 include .env
 
 install: build
diff --git a/composer.json b/composer.json
index aca7075..1befd92 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "license": "BSD-2-Clause",
     "authors": [],
     "require-dev": {
-        "phpunit/phpunit": "^12.1"
+        "phpunit/phpunit": "*"
     },
     "autoload": {
     	"psr-4": {
diff --git a/dev.env b/dev.env
index 9c44aa0..9504293 100644
--- a/dev.env
+++ b/dev.env
@@ -1,3 +1,4 @@
 PHP_DEV_IMAGE=samizdam/skeleton/php-dev
+PHP_VERSION=8.4
 # default tag for images, replaced with CI environment value: branch or tag name
 REVISION=master
diff --git a/tests/.gitkeep b/tests/.gitkeep
new file mode 100644
index 0000000..e69de29