diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 7d81158..ba3e278 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -22,15 +22,11 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.1"
-          - "7.2"
-          - "7.3"
-          - "7.4"
-          - "8.0"
           - "8.1"
           - "8.2"
           - "8.3"
           - "8.4"
+          - "8.5"
         os:
           - ubuntu-latest
           - windows-latest
@@ -98,7 +94,7 @@ jobs:
         with:
           coverage: "none"
           ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
-          php-version: "8.1"
+          php-version: "8.5"
           tools: composer:v2
 
       - uses: "ramsey/composer-install@v2"
@@ -135,7 +131,7 @@ jobs:
         with:
           coverage: "pcov"
           ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
-          php-version: "8.1"
+          php-version: "8.5"
           tools: composer:v2
 
       - uses: "ramsey/composer-install@v2"
@@ -182,7 +178,7 @@ jobs:
         with:
           coverage: "none"
           ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
-          php-version: "8.1"
+          php-version: "8.5"
           tools: composer:v2, composer-normalize, composer-require-checker
 
       - name: "Validate composer.json"
@@ -251,9 +247,9 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ${{ steps.composercache.outputs.dir }}
-          key: composer-${{ runner.os }}-7.1-${{ hashFiles('composer.*') }}
+          key: composer-${{ runner.os }}-8.1-${{ hashFiles('composer.*') }}
           restore-keys: |
-            composer-${{ runner.os }}-7.1-
+            composer-${{ runner.os }}-8.1-
             composer-${{ runner.os }}-
             composer-
 
@@ -286,11 +282,11 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.0"
-          - "5.6"
-          - "5.5"
-          - "5.4"
-          - "5.3"
+          - "7.1"
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
 
     steps:
       - name: "Install PHP"
@@ -313,7 +309,7 @@ jobs:
         run: |
           php -r "passthru('./churn.phar', \$code); if (\$code !== 1) exit('Invalid error code. Expected 1, got ' . \$code);" &> error
           echo "Error code is OK. Now testing error message..."
-          grep 'The application requires the version ">=7.1.3" or greater' error
+          grep 'The application requires the version ">=8.1.33" or greater' error
           echo "Everything is OK."
 
 
@@ -326,8 +322,11 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.1"
           - "8.1"
+          - "8.2"
+          - "8.3"
+          - "8.4"
+          - "8.5"
 
     steps:
       - name: "Checkout"
diff --git a/Makefile b/Makefile
index 701826f..ce81099 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@ box:
 build:	## Build churn.phar
 build: box
 	scp -r src bin composer.json box.json.dist manifest.xml LICENSE.md build/
-	$(COMPOSER_BIN) config platform.php 7.1.3 --working-dir=build/
+	$(COMPOSER_BIN) config platform.php 8.1.33 --working-dir=build/
 	$(COMPOSER_BIN) update --no-dev --no-interaction --prefer-dist --working-dir=build/
 	CHURN_VERSION=$$( $(PHP_BIN) build/bin/churn --version --no-ansi | grep -Po '(?<= )[^@]+' ) ;\
 	sed -i -e "s@0.0.0-dev@$${CHURN_VERSION}@g" build/manifest.xml
diff --git a/bin/app.php b/bin/app.php
index 25c3c54..d86e4ca 100644
--- a/bin/app.php
+++ b/bin/app.php
@@ -16,8 +16,11 @@
 
     return $version;
 })('bmitch/churn-php'));
-$application->add(AssessComplexityCommand::newInstance());
-$application->add($run = RunCommand::newInstance());
+$method = method_exists($application, 'addCommand')
+    ? 'addCommand'
+    : 'add';
+$application->{$method}(AssessComplexityCommand::newInstance());
+$application->{$method}($run = RunCommand::newInstance());
 $application->setDefaultCommand($run->getName());
 
 return $application;
diff --git a/bin/churn b/bin/churn
index 21fba1a..aa7f012 100755
--- a/bin/churn
+++ b/bin/churn
@@ -12,21 +12,21 @@ if (!version_compare(PHP_VERSION, PHP_VERSION, '=')) {
         )
     );
 
-    die(1);
+    exit(1);
 }
 
-if (version_compare('7.1.3', PHP_VERSION, '>=')) {
+if (version_compare(PHP_VERSION, '8.1.33', '<')) {
     fwrite(
         STDERR,
         sprintf(
-            'The application requires the version ">=7.1.3" or greater.' . PHP_EOL .
+            'The application requires the version ">=8.1.33" or greater.' . PHP_EOL .
             'You are using PHP %s (%s).' . PHP_EOL,
             PHP_VERSION,
             PHP_BINARY
         )
     );
 
-    die(1);
+    exit(1);
 }
 
 require_once __DIR__ . '/bootstrap.php';
diff --git a/box.json.dist b/box.json.dist
index 14ebec6..2c8ea6d 100644
--- a/box.json.dist
+++ b/box.json.dist
@@ -18,6 +18,9 @@
         {
             "name": "*.php",
             "in": "vendor"
+        },
+        {
+            "in": "vendor/symfony/console/Resources"
         }
     ],
    "output": "churn.phar"
diff --git a/composer.json b/composer.json
index 6c7d076..56c266b 100644
--- a/composer.json
+++ b/composer.json
@@ -22,11 +22,11 @@
     ],
     "homepage": "https://github.com/bmitch/churn-php",
     "require": {
-        "php": ">=7.1.3",
+        "php": ">=8.1.33",
         "ext-json": "*",
         "ext-tokenizer": "*",
         "composer-runtime-api": "^2",
-        "symfony/console": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0",
+        "symfony/console": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0",
         "symfony/filesystem": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0",
         "symfony/process": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0",
         "symfony/yaml": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0",
@@ -86,7 +86,7 @@
             "phpcs",
             "phpcs --standard=phpcs-tests.xml",
             "psalm",
-            "phpstan"
+            "phpstan --memory-limit=-1"
         ]
     }
 }
diff --git a/manifest.xml b/manifest.xml
index f497780..5da0798 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -6,7 +6,7 @@
 		<license type="MIT" url="https://github.com/bmitch/churn-php/blob/master/LICENSE.md"/>
 	</copyright>
 	<requires>
-		<php version="^7.1 || ^8.0">
+		<php version="^8.1">
 			<ext name="json"/>
 			<ext name="tokenizer"/>
 		</php>
diff --git a/phpcs-tests.xml b/phpcs-tests.xml
index 0d1ea2d..af81584 100644
--- a/phpcs-tests.xml
+++ b/phpcs-tests.xml
@@ -14,7 +14,7 @@
   </rule>
 
   <!-- PHPCompatibility -->
-  <config name="testVersion" value="7.1-"/>
+  <config name="testVersion" value="8.1-"/>
   <rule ref="PHPCompatibility"/>
 
   <!-- Dock Blocks -->
diff --git a/phpstan.neon b/phpstan.neon
index f80b591..935853f 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -12,6 +12,8 @@ parameters:
   reportUnmatchedIgnoredErrors: true
   ignoreErrors:
     - '/^Casting to .+ something that''s already/'
+    - "#Call to function method_exists\\(\\) with Symfony\\\\Component\\\\Console\\\\Application and 'addCommand' will always evaluate to true#"
+    - "#Variable method call on Symfony\\\\Component\\\\Console\\\\Application#"
 
   checkTooWideReturnTypesInProtectedAndPublicMethods: true
   checkUninitializedProperties: true
diff --git a/src/Process/ChangesCount/FossilChangesCountProcess.php b/src/Process/ChangesCount/FossilChangesCountProcess.php
index 9fd4a86..8a6f55f 100644
--- a/src/Process/ChangesCount/FossilChangesCountProcess.php
+++ b/src/Process/ChangesCount/FossilChangesCountProcess.php
@@ -24,7 +24,7 @@ public function __construct(File $file, string $dateSince)
     {
         $process = new Process([
             'fossil', 'timeline', '-t', 'ci',
-            '-W', '0', '-n', '0', 'after', $dateSince,
+            '-W', '0', 'after', $dateSince,
             '-p', $file->getFullPath(),
         ], \dirname($file->getFullPath()));
 
diff --git a/tests/EndToEnd/FossilTest.php b/tests/EndToEnd/FossilTest.php
index 54eef6d..5afbd96 100644
--- a/tests/EndToEnd/FossilTest.php
+++ b/tests/EndToEnd/FossilTest.php
@@ -16,21 +16,28 @@ final class FossilTest extends BaseTestCase
      */
     private $commandTester;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
         $application = new Application('churn-php', 'test');
-        $application->add(RunCommand::newInstance());
+        $method = \method_exists($application, 'addCommand')
+            ? 'addCommand'
+            : 'add';
+        $application->{$method}(RunCommand::newInstance());
         $command = $application->find('run');
         $this->commandTester = new CommandTester($command);
     }
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/EndToEnd/MercurialTest.php b/tests/EndToEnd/MercurialTest.php
index 9c871b3..db85c37 100644
--- a/tests/EndToEnd/MercurialTest.php
+++ b/tests/EndToEnd/MercurialTest.php
@@ -16,21 +16,28 @@ final class MercurialTest extends BaseTestCase
      */
     private $commandTester;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
         $application = new Application('churn-php', 'test');
-        $application->add(RunCommand::newInstance());
+        $method = \method_exists($application, 'addCommand')
+            ? 'addCommand'
+            : 'add';
+        $application->{$method}(RunCommand::newInstance());
         $command = $application->find('run');
         $this->commandTester = new CommandTester($command);
     }
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/EndToEnd/SubversionTest.php b/tests/EndToEnd/SubversionTest.php
index 490e6b0..2e28a97 100644
--- a/tests/EndToEnd/SubversionTest.php
+++ b/tests/EndToEnd/SubversionTest.php
@@ -16,21 +16,28 @@ final class SubversionTest extends BaseTestCase
      */
     private $commandTester;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
         $application = new Application('churn-php', 'test');
-        $application->add(RunCommand::newInstance());
+        $method = \method_exists($application, 'addCommand')
+            ? 'addCommand'
+            : 'add';
+        $application->{$method}(RunCommand::newInstance());
         $command = $application->find('run');
         $this->commandTester = new CommandTester($command);
     }
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Integration/Command/AssessComplexityCommandTest.php b/tests/Integration/Command/AssessComplexityCommandTest.php
index c33506e..ae696ef 100644
--- a/tests/Integration/Command/AssessComplexityCommandTest.php
+++ b/tests/Integration/Command/AssessComplexityCommandTest.php
@@ -16,21 +16,28 @@ final class AssessComplexityCommandTest extends BaseTestCase
      */
     private $commandTester;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
         $application = new Application('churn-php', 'test');
-        $application->add(AssessComplexityCommand::newInstance());
+        $method = \method_exists($application, 'addCommand')
+            ? 'addCommand'
+            : 'add';
+        $application->{$method}(AssessComplexityCommand::newInstance());
         $command = $application->find('assess-complexity');
         $this->commandTester = new CommandTester($command);
     }
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Integration/Command/RunCommandTest.php b/tests/Integration/Command/RunCommandTest.php
index 3ae94a5..e95e71a 100644
--- a/tests/Integration/Command/RunCommandTest.php
+++ b/tests/Integration/Command/RunCommandTest.php
@@ -28,21 +28,28 @@ final class RunCommandTest extends BaseTestCase
      */
     private $tmpFile;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
         $application = new Application('churn-php', 'test');
-        $application->add(RunCommand::newInstance());
+        $method = \method_exists($application, 'addCommand')
+            ? 'addCommand'
+            : 'add';
+        $application->{$method}(RunCommand::newInstance());
         $command = $application->find('run');
         $this->commandTester = new CommandTester($command);
     }
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Integration/File/FileFinderTest.php b/tests/Integration/File/FileFinderTest.php
index 413491a..af325b4 100644
--- a/tests/Integration/File/FileFinderTest.php
+++ b/tests/Integration/File/FileFinderTest.php
@@ -15,9 +15,11 @@ final class FileFinderTest extends BaseTestCase
      */
     private $fileFinder;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Integration/ManifestTest.php b/tests/Integration/ManifestTest.php
index 45a4908..f6a7cd0 100644
--- a/tests/Integration/ManifestTest.php
+++ b/tests/Integration/ManifestTest.php
@@ -16,9 +16,11 @@ final class ManifestTest extends BaseTestCase
      */
     private $manifest;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Configuration/Validator/CommitsSinceTest.php b/tests/Unit/Configuration/Validator/CommitsSinceTest.php
index 1afcc0a..2aaa412 100644
--- a/tests/Unit/Configuration/Validator/CommitsSinceTest.php
+++ b/tests/Unit/Configuration/Validator/CommitsSinceTest.php
@@ -15,9 +15,11 @@ final class CommitsSinceTest extends ValidatorBaseTestCase
      */
     private $validator;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Configuration/Validator/ValidatorBaseTestCase.php b/tests/Unit/Configuration/Validator/ValidatorBaseTestCase.php
index fb93309..f085572 100644
--- a/tests/Unit/Configuration/Validator/ValidatorBaseTestCase.php
+++ b/tests/Unit/Configuration/Validator/ValidatorBaseTestCase.php
@@ -43,16 +43,18 @@ abstract public static function provideValidValues(): iterable;
      */
     abstract public static function provideInvalidValues(): iterable;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
         $this->config = new EditableConfig();
     }
 
-        /**
+    /**
      * @test
      */
     public function it_returns_the_default_value(): void
diff --git a/tests/Unit/File/FileFinderTest.php b/tests/Unit/File/FileFinderTest.php
index 596b543..5b635c5 100644
--- a/tests/Unit/File/FileFinderTest.php
+++ b/tests/Unit/File/FileFinderTest.php
@@ -16,9 +16,11 @@ final class FileFinderTest extends BaseTestCase
      */
     protected $fileFinder;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/File/FileHelperTest.php b/tests/Unit/File/FileHelperTest.php
index 53c782c..9cdded3 100644
--- a/tests/Unit/File/FileHelperTest.php
+++ b/tests/Unit/File/FileHelperTest.php
@@ -16,9 +16,11 @@ final class FileHelperTest extends BaseTestCase
      */
     private static $filesToDelete = [];
 
-    /** @return void */
+    /**
+     * Test teardown
+     */
     #[\Override]
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Unit/File/FileTest.php b/tests/Unit/File/FileTest.php
index 2a6d863..bd2404f 100644
--- a/tests/Unit/File/FileTest.php
+++ b/tests/Unit/File/FileTest.php
@@ -14,9 +14,11 @@ final class FileTest extends BaseTestCase
      **/
     private $file;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Process/ChangesCount/NoVcsChangesCountProcessTest.php b/tests/Unit/Process/ChangesCount/NoVcsChangesCountProcessTest.php
index 5256eec..35747b5 100644
--- a/tests/Unit/Process/ChangesCount/NoVcsChangesCountProcessTest.php
+++ b/tests/Unit/Process/ChangesCount/NoVcsChangesCountProcessTest.php
@@ -15,9 +15,11 @@ final class NoVcsChangesCountProcessTest extends BaseTestCase
      */
     private $process;
 
-    /** @return void */
+    /**
+     * TEst setup
+     */
     #[\Override]
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Process/ConcreteProcessFactoryTest.php b/tests/Unit/Process/ConcreteProcessFactoryTest.php
index 2c224ac..98a78c5 100644
--- a/tests/Unit/Process/ConcreteProcessFactoryTest.php
+++ b/tests/Unit/Process/ConcreteProcessFactoryTest.php
@@ -20,9 +20,11 @@ final class ConcreteProcessFactoryTest extends BaseTestCase
      */
     private $processFactory;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Result/ResultTest.php b/tests/Unit/Result/ResultTest.php
index 1c0d4d4..16b406f 100644
--- a/tests/Unit/Result/ResultTest.php
+++ b/tests/Unit/Result/ResultTest.php
@@ -18,9 +18,11 @@ final class ResultTest extends BaseTestCase
      */
     protected $result;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Unit/Result/ResultsRendererFactoryTest.php b/tests/Unit/Result/ResultsRendererFactoryTest.php
index 1af30ac..585e5dd 100644
--- a/tests/Unit/Result/ResultsRendererFactoryTest.php
+++ b/tests/Unit/Result/ResultsRendererFactoryTest.php
@@ -19,9 +19,11 @@ final class ResultsRendererFactoryTest extends BaseTestCase
      */
     private $factory;
 
-    /** @return void */
+    /**
+     * Test setup
+     */
     #[\Override]
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/console-application.php b/tests/console-application.php
index 13e8cd5..9d5cb5a 100644
--- a/tests/console-application.php
+++ b/tests/console-application.php
@@ -15,7 +15,10 @@
 use Symfony\Component\Console\Application;
 
 $application = new Application('churn-php', 'test');
-$application->add(AssessComplexityCommand::newInstance());
-$application->add(RunCommand::newInstance());
+$method = method_exists($application, 'addCommand')
+    ? 'addCommand'
+    : 'add';
+$application->{$method}(AssessComplexityCommand::newInstance());
+$application->{$method}(RunCommand::newInstance());
 
 return $application;
diff --git a/tests/docker/fossil/Dockerfile b/tests/docker/fossil/Dockerfile
index cbe2ab4..756dc42 100644
--- a/tests/docker/fossil/Dockerfile
+++ b/tests/docker/fossil/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.1-cli
+FROM php:8.4-cli
 
 # Requirements for running phpunit
 RUN apt-get update && apt-get install -y git zip
diff --git a/tests/docker/mercurial/Dockerfile b/tests/docker/mercurial/Dockerfile
index 6eb96f0..3d8d44f 100644
--- a/tests/docker/mercurial/Dockerfile
+++ b/tests/docker/mercurial/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.1-cli
+FROM php:8.4-cli
 
 # Requirements for running phpunit
 RUN apt-get update && apt-get install -y git zip
diff --git a/tests/docker/subversion/Dockerfile b/tests/docker/subversion/Dockerfile
index 5ec61e2..b00875a 100644
--- a/tests/docker/subversion/Dockerfile
+++ b/tests/docker/subversion/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.1-cli
+FROM php:8.4-cli
 
 # Requirements for running phpunit
 RUN apt-get update && apt-get install -y git zip