diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..22aac70
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,14 @@
+/tests export-ignore
+/vendor export-ignore
+
+/LICENSE export-ignore
+/Makefile export-ignore
+/README.md export-ignore
+/phpmd.xml export-ignore
+/phpunit.xml export-ignore
+/phpstan.neon.dist export-ignore
+/infection.json.dist export-ignore
+
+/.github export-ignore
+/.gitignore export-ignore
+/.gitattributes export-ignore
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 32850ac..105bc90 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Use PHP 8.2
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+
       - name: Install dependencies
         run: composer update --no-progress --optimize-autoloader
 
@@ -33,6 +38,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Use PHP 8.2
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+
       - name: Install dependencies
         run: composer update --no-progress --optimize-autoloader
 
diff --git a/Makefile b/Makefile
index 9bf35fe..1b3026e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,17 @@
 DOCKER_RUN = docker run --rm -it --net=host -v ${PWD}:/app -w /app gustavofreze/php:8.2
 
-.PHONY: configure test test-no-coverage review show-reports clean
+.PHONY: configure test test-file test-no-coverage review show-reports clean
 
 configure:
 	@${DOCKER_RUN} composer update --optimize-autoloader
 
-test: review
+test:
 	@${DOCKER_RUN} composer tests
 
-test-no-coverage: review
+test-file:
+	@${DOCKER_RUN} composer tests-file-no-coverage ${FILE}
+
+test-no-coverage:
 	@${DOCKER_RUN} composer tests-no-coverage
 
 review:
@@ -19,4 +22,4 @@ show-reports:
 
 clean:
 	@sudo chown -R ${USER}:${USER} ${PWD}
-	@rm -rf report vendor
+	@rm -rf report vendor .phpunit.cache
diff --git a/README.md b/README.md
index e9d0419..e9279db 100644
--- a/README.md
+++ b/README.md
@@ -32,9 +32,9 @@ get the default amount fraction digits for the respective currency.
 ```php
 $currency = Currency::USD;
 
-$currency->name;                       # USD
-$currency->value;                      # USD
-$currency->getDefaultFractionDigits(); # 2
+$currency->name;                # USD
+$currency->value;               # USD
+$currency->getFractionDigits(); # 2
 ```
 
 <div id='license'></div>
diff --git a/composer.json b/composer.json
index cbd1e07..e4ed20c 100644
--- a/composer.json
+++ b/composer.json
@@ -9,8 +9,6 @@
     "keywords": [
         "vo",
         "psr",
-        "psr-4",
-        "psr-12",
         "currency",
         "iso-4217",
         "tiny-blocks",
@@ -22,6 +20,10 @@
             "homepage": "https://github.com/gustavofreze"
         }
     ],
+    "support": {
+        "issues": "https://github.com/tiny-blocks/currency/issues",
+        "source": "https://github.com/tiny-blocks/currency"
+    },
     "config": {
         "sort-packages": true,
         "allow-plugins": {
@@ -39,24 +41,27 @@
         }
     },
     "require": {
-        "php": "^8.1||^8.2"
+        "php": "^8.2"
     },
     "require-dev": {
-        "infection/infection": "^0.26",
-        "phpmd/phpmd": "^2.13",
-        "phpunit/phpunit": "^9.6",
-        "squizlabs/php_codesniffer": "^3.7"
+        "phpmd/phpmd": "^2.15",
+        "phpunit/phpunit": "^11",
+        "phpstan/phpstan": "^1",
+        "infection/infection": "^0.29",
+        "squizlabs/php_codesniffer": "^3.10"
     },
     "scripts": {
         "phpcs": "phpcs --standard=PSR12 --extensions=php ./src",
         "phpmd": "phpmd ./src text phpmd.xml --suffixes php --exclude /src/Currency.php --ignore-violations-on-exit",
+        "phpstan": "phpstan analyse -c phpstan.neon.dist --quiet --no-progress",
         "test": "phpunit --log-junit=report/coverage/junit.xml --coverage-xml=report/coverage/coverage-xml --coverage-html=report/coverage/coverage-html tests",
         "test-mutation": "infection --only-covered --logger-html=report/coverage/mutation-report.html --coverage=report/coverage --min-msi=100 --min-covered-msi=100 --threads=4",
         "test-no-coverage": "phpunit --no-coverage",
         "test-mutation-no-coverage": "infection --only-covered --min-msi=100 --threads=4",
         "review": [
             "@phpcs",
-            "@phpmd"
+            "@phpmd",
+            "@phpstan"
         ],
         "tests": [
             "@test",
diff --git a/infection.json.dist b/infection.json.dist
index d840b61..351e7f9 100644
--- a/infection.json.dist
+++ b/infection.json.dist
@@ -1,22 +1,21 @@
 {
     "timeout": 10,
     "testFramework": "phpunit",
-    "tmpDir": "report/",
+    "tmpDir": "report/infection/",
     "source": {
         "directories": [
             "src"
         ]
     },
     "logs": {
-        "text": "report/logs/infection-text.log",
-        "summary": "report/logs/infection-summary.log"
+        "text": "report/infection/logs/infection-text.log",
+        "summary": "report/infection/logs/infection-summary.log"
     },
     "mutators": {
-        "@default": true,
-        "MatchArmRemoval": false
+        "@default": true
     },
     "phpUnit": {
         "configDir": "",
         "customPath": "./vendor/bin/phpunit"
     }
-}
\ No newline at end of file
+}
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
new file mode 100644
index 0000000..b99884f
--- /dev/null
+++ b/phpstan.neon.dist
@@ -0,0 +1,7 @@
+parameters:
+  paths:
+    - src
+  level: 9
+  tmpDir: report/phpstan
+  ignoreErrors:
+  reportUnmatchedIgnoredErrors: false
diff --git a/phpunit.xml b/phpunit.xml
index 3d05fc8..7f080dd 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,25 +1,35 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         bootstrap="vendor/autoload.php"
-         cacheResultFile="report/.phpunit.result.cache"
-         backupGlobals="false"
-         backupStaticAttributes="false"
+         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
          colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+         bootstrap="vendor/autoload.php"
+         failOnRisky="true"
+         failOnWarning="true"
+         cacheDirectory=".phpunit.cache"
+         beStrictAboutOutputDuringTests="true">
+
+    <source>
+        <include>
+            <directory>src</directory>
+        </include>
+    </source>
+
     <testsuites>
         <testsuite name="default">
-            <directory suffix="Test.php">tests</directory>
+            <directory>tests</directory>
         </testsuite>
     </testsuites>
 
     <coverage>
-        <include>
-            <directory suffix=".php">src</directory>
-        </include>
+        <report>
+            <text outputFile="report/coverage.txt"/>
+            <html outputDirectory="report/html/"/>
+            <clover outputFile="report/coverage-clover.xml"/>
+        </report>
     </coverage>
+
+    <logging>
+        <junit outputFile="report/execution-result.xml"/>
+    </logging>
+
 </phpunit>
diff --git a/src/Currency.php b/src/Currency.php
index feef080..15093fb 100644
--- a/src/Currency.php
+++ b/src/Currency.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace TinyBlocks\Currency;
 
 /**
@@ -180,17 +182,22 @@ enum Currency: string
     case ZMW = 'ZMW';
     case ZWL = 'ZWL';
 
-    public function getDefaultFractionDigits(): int
+    private const FRACTION_DIGITS_TWO = 2;
+    private const FRACTION_DIGITS_ZERO = 0;
+    private const FRACTION_DIGITS_FOUR = 4;
+    private const FRACTION_DIGITS_THREE = 3;
+
+    public function getFractionDigits(): int
     {
         return match ($this) {
             Currency::BIF, Currency::CLP, Currency::DJF, Currency::GNF, Currency::ISK,
             Currency::JPY, Currency::KMF, Currency::KRW, Currency::PYG, Currency::RWF,
             Currency::UGX, Currency::UYI, Currency::VND, Currency::VUV, Currency::XAF,
-            Currency::XOF, Currency::XPF  => 0,
+            Currency::XOF, Currency::XPF  => self::FRACTION_DIGITS_ZERO,
             Currency::BHD, Currency::IQD, Currency::JOD, Currency::KWD, Currency::LYD,
-            Currency::OMR, Currency::TND  => 3,
-            Currency::CLF, Currency::UYW, => 4,
-            default                       => 2
+            Currency::OMR, Currency::TND  => self::FRACTION_DIGITS_THREE,
+            Currency::CLF, Currency::UYW, => self::FRACTION_DIGITS_FOUR,
+            default                       => self::FRACTION_DIGITS_TWO
         };
     }
 }
diff --git a/tests/CurrencyTest.php b/tests/CurrencyTest.php
index 0e86cd9..0d5395b 100644
--- a/tests/CurrencyTest.php
+++ b/tests/CurrencyTest.php
@@ -1,65 +1,68 @@
 <?php
 
+declare(strict_types=1);
+
 namespace TinyBlocks\Currency;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 final class CurrencyTest extends TestCase
 {
-    /**
-     * @dataProvider providerForTestValidNameAndValue
-     */
+    #[DataProvider('currenciesDataProvider')]
     public function testValidNameAndValue(string $name, string $value): void
     {
-        self::assertEquals(3, strlen($name));
-        self::assertEquals(3, strlen($value));
+        self::assertSame(3, strlen($name));
+        self::assertSame(3, strlen($value));
     }
 
-    /**
-     * @dataProvider providerForTestGetDefaultFractionDigits
-     */
-    public function testGetDefaultFractionDigits(int $expected, Currency $currency): void
+    #[DataProvider('fractionDigitsDataProvider')]
+    public function testGetFractionDigits(int $expected, Currency $currency): void
     {
-        $actual = $currency->getDefaultFractionDigits();
+        $actual = $currency->getFractionDigits();
 
-        self::assertEquals($expected, $actual);
+        self::assertSame($expected, $actual);
     }
 
-    public function providerForTestValidNameAndValue(): array
+    public static function currenciesDataProvider(): array
     {
-        return array_map(fn(Currency $currency) => [
+        return array_map(static fn(Currency $currency): array => [
             'name'  => $currency->name,
             'value' => $currency->value
         ], Currency::cases());
     }
 
-    public function providerForTestGetDefaultFractionDigits(): array
+    public static function fractionDigitsDataProvider(): array
     {
         return [
-            [
-                'expected' => 0,
-                'currency' => Currency::CLP,
-            ],
-            [
-                'expected' => 2,
-                'currency' => Currency::BRL,
-            ],
-            [
-                'expected' => 2,
-                'currency' => Currency::USD,
-            ],
-            [
-                'expected' => 2,
-                'currency' => Currency::EUR,
-            ],
-            [
-                'expected' => 3,
-                'currency' => Currency::KWD,
-            ],
-            [
-                'expected' => 4,
-                'currency' => Currency::CLF
-            ]
+            'Currency BIF with digits 0' => ['currency' => Currency::BIF, 'expected' => 0],
+            'Currency CLP with digits 0' => ['currency' => Currency::CLP, 'expected' => 0],
+            'Currency DJF with digits 0' => ['currency' => Currency::DJF, 'expected' => 0],
+            'Currency GNF with digits 0' => ['currency' => Currency::GNF, 'expected' => 0],
+            'Currency ISK with digits 0' => ['currency' => Currency::ISK, 'expected' => 0],
+            'Currency JPY with digits 0' => ['currency' => Currency::JPY, 'expected' => 0],
+            'Currency KMF with digits 0' => ['currency' => Currency::KMF, 'expected' => 0],
+            'Currency KRW with digits 0' => ['currency' => Currency::KRW, 'expected' => 0],
+            'Currency PYG with digits 0' => ['currency' => Currency::PYG, 'expected' => 0],
+            'Currency RWF with digits 0' => ['currency' => Currency::RWF, 'expected' => 0],
+            'Currency UGX with digits 0' => ['currency' => Currency::UGX, 'expected' => 0],
+            'Currency UYI with digits 0' => ['currency' => Currency::UYI, 'expected' => 0],
+            'Currency VND with digits 0' => ['currency' => Currency::VND, 'expected' => 0],
+            'Currency VUV with digits 0' => ['currency' => Currency::VUV, 'expected' => 0],
+            'Currency XAF with digits 0' => ['currency' => Currency::XAF, 'expected' => 0],
+            'Currency XOF with digits 0' => ['currency' => Currency::XOF, 'expected' => 0],
+            'Currency XPF with digits 0' => ['currency' => Currency::XPF, 'expected' => 0],
+            'Currency USD with digits 2' => ['currency' => Currency::USD, 'expected' => 2],
+            'Currency EUR with digits 2' => ['currency' => Currency::EUR, 'expected' => 2],
+            'Currency BHD with digits 3' => ['currency' => Currency::BHD, 'expected' => 3],
+            'Currency IQD with digits 3' => ['currency' => Currency::IQD, 'expected' => 3],
+            'Currency JOD with digits 3' => ['currency' => Currency::JOD, 'expected' => 3],
+            'Currency KWD with digits 3' => ['currency' => Currency::KWD, 'expected' => 3],
+            'Currency LYD with digits 3' => ['currency' => Currency::LYD, 'expected' => 3],
+            'Currency OMR with digits 3' => ['currency' => Currency::OMR, 'expected' => 3],
+            'Currency TND with digits 3' => ['currency' => Currency::TND, 'expected' => 3],
+            'Currency CLF with digits 4' => ['currency' => Currency::CLF, 'expected' => 4],
+            'Currency UYW with digits 4' => ['currency' => Currency::UYW, 'expected' => 4]
         ];
     }
 }