diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 3f16902..135bd43 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['8.1', '8.2', '8.3', '8.4']
+        php-versions: ['8.2', '8.3', '8.4']
         symfony-versions: ['^6.0', '^7.0']
     name: PHP ${{ matrix.php-versions }} with Symfony ${{ matrix.symfony-versions }}
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fd595b..5116686 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.6.1] - 2026-03-10
+### Changed
+- Solve implicitly nullable parameters to better support PHP 8.4 ([#27](https://github.com/timoschinkel/codeowners-cli/pull/27))
+
+### Removed 
+- Support for PHP 8.1 ([#27](https://github.com/timoschinkel/codeowners-cli/pull/27))
+
 ## [1.6.0] - 2025-05-28
 ### Added
 - `-o`/`--owner-only` option for `codeowners owner` to print only the owner ([#26](https://github.com/timoschinkel/codeowners-cli/pull/26))
diff --git a/composer.json b/composer.json
index ead8726..b8abc09 100755
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "project",
     "license": "Apache-2.0",
     "require": {
-        "php": "^8.1",
+        "php": "^8.2",
         "symfony/console": "^6.0|^7.0",
         "timoschinkel/codeowners": "^2.0",
         "symfony/finder": "^6.0|^7.0"
diff --git a/src/FileLocator/FileLocatorFactory.php b/src/FileLocator/FileLocatorFactory.php
index f17ecf1..8bad6ab 100644
--- a/src/FileLocator/FileLocatorFactory.php
+++ b/src/FileLocator/FileLocatorFactory.php
@@ -6,7 +6,7 @@
 
 final class FileLocatorFactory implements FileLocatorFactoryInterface
 {
-    public function getFileLocator(string $workingDirectory, string $specifiedFile = null): FileLocatorInterface
+    public function getFileLocator(string $workingDirectory, ?string $specifiedFile = null): FileLocatorInterface
     {
         return $specifiedFile !== null
             ? new SpecifiedFileLocator($specifiedFile)
diff --git a/src/FileLocator/FileLocatorFactoryInterface.php b/src/FileLocator/FileLocatorFactoryInterface.php
index 147c345..5f09506 100644
--- a/src/FileLocator/FileLocatorFactoryInterface.php
+++ b/src/FileLocator/FileLocatorFactoryInterface.php
@@ -6,5 +6,5 @@
 
 interface FileLocatorFactoryInterface
 {
-    public function getFileLocator(string $workingDirectory, string $specifiedFile = null): FileLocatorInterface;
+    public function getFileLocator(string $workingDirectory, ?string $specifiedFile = null): FileLocatorInterface;
 }