diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..bd17639
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1 @@
+github: [staabm]
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..0f111c6
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,15 @@
+# Dependabot config reference
+# https://help.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+    -   package-ecosystem: composer
+        directory: /
+        versioning-strategy: increase
+        schedule:
+            interval: monthly
+
+    -   package-ecosystem: github-actions
+        directory: /
+        schedule:
+            interval: monthly
diff --git a/.github/workflows/php-linter.yml b/.github/workflows/php-linter.yml
new file mode 100644
index 0000000..9a8180b
--- /dev/null
+++ b/.github/workflows/php-linter.yml
@@ -0,0 +1,29 @@
+name: PHP Linter
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  php-linter:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.draft == false
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.client_payload.pull_request.head.ref }}
+
+      -   name: Setup PHP
+          uses: shivammathur/setup-php@v2
+          with:
+            php-version: 7.4
+            coverage: none
+            tools: parallel-lint
+
+      -   name: Lint PHP
+          run: composer exec --no-interaction -- parallel-lint bin/ lib/ tests/
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
new file mode 100644
index 0000000..0ae22d9
--- /dev/null
+++ b/.github/workflows/unit-tests.yml
@@ -0,0 +1,45 @@
+name: Unit tests
+
+on:
+    push:
+        branches:
+            - main
+    pull_request:
+        types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+    phpunit:
+        runs-on: ${{ matrix.os }}
+
+        strategy:
+            matrix:
+                include:
+                    -   os: ubuntu-latest
+                        php-version: '7.4'
+                    -   os: ubuntu-latest
+                        php-version: '8.0'
+                    -   os: ubuntu-latest
+                        php-version: '8.1'
+                    -   os: ubuntu-latest
+                        php-version: '8.2'
+
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v4
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php-version }}
+                    coverage: none # disable xdebug, pcov
+
+            -   name: Composer install
+                uses: ramsey/composer-install@v3
+                with:
+                    composer-options: '--ansi --prefer-dist'
+
+            -   name: Setup Problem Matchers for PHPUnit
+                run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+            -   name: Run unit tests
+                run: vendor/bin/phpunit --colors=always
diff --git a/.gitignore b/.gitignore
index f6134a2..92f7dcb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@
 bundles/*
 !bundles/.
 
-.idea
\ No newline at end of file
+.idea
+.phpunit.result.cache
diff --git a/src/AbstractPasswordExposedChecker.php b/src/AbstractPasswordExposedChecker.php
index ef8d7a5..bc6a268 100644
--- a/src/AbstractPasswordExposedChecker.php
+++ b/src/AbstractPasswordExposedChecker.php
@@ -106,7 +106,7 @@ public function isExposedByHash(string $hash): ?bool
     }
 
     /**
-     * @param $hash
+     * @param string $hash
      *
      * @throws \Psr\Http\Client\ClientExceptionInterface
      *
@@ -121,7 +121,7 @@ protected function makeRequest(string $hash): ResponseInterface
     }
 
     /**
-     * @param $string
+     * @param string $string
      *
      * @return string
      */