diff --git a/.github/workflows/php-qa.yml b/.github/workflows/php-qa.yml
index c170644..344ee2f 100644
--- a/.github/workflows/php-qa.yml
+++ b/.github/workflows/php-qa.yml
@@ -38,7 +38,7 @@ jobs:
         uses: inpsyde/reusable-workflows/.github/workflows/lint-php.yml@main
         strategy:
             matrix:
-                php: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
+                php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
         with:
             PHP_VERSION: ${{ matrix.php }}
             LINT_ARGS: '-e php --colors --show-deprecated ./src'
@@ -54,7 +54,7 @@ jobs:
         uses: inpsyde/reusable-workflows/.github/workflows/static-analysis-php.yml@main
         strategy:
             matrix:
-                php: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
+                php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
                 include:
                     - php: '7.4'
                       composer: '--ignore-platform-req=php'
diff --git a/.github/workflows/php-unit-tests.yml b/.github/workflows/php-unit-tests.yml
index b5be886..ead69f3 100644
--- a/.github/workflows/php-unit-tests.yml
+++ b/.github/workflows/php-unit-tests.yml
@@ -29,7 +29,7 @@ jobs:
 
         strategy:
             matrix:
-                php: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
+                php: [ '7.4', '8.0', '8.1', '8.2', '8.3']
                 container-version: [ '^1.1.0', '^2' ]
                 dependency-versions: [ 'lowest', 'highest' ]
                 include:
@@ -55,7 +55,7 @@ jobs:
 
             -   name: Setup dependencies for PSR-11 target version
                 run: |
-                    composer remove inpsyde/php-coding-standards --dev --no-update
+                    composer remove syde/phpcs --dev --no-update
                     composer require "psr/container:${{ matrix.container-version }}" --no-update
                     composer config --no-plugins allow-plugins.roots/wordpress-core-installer false
 
@@ -76,3 +76,9 @@ jobs:
                     files: ./coverage.xml
                     flags: unittests
                     verbose: true
+    # PHP 8.4 causes many failures with "lowest" dependency version due incompatibility.
+    # So, we're running it in an isolated step.
+    test-phpunit-84:
+        uses: inpsyde/reusable-workflows/.github/workflows/tests-unit-php.yml@main
+        with:
+            PHP_VERSION: "8.4"
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 7ca5348..2176dd3 100644
--- a/composer.json
+++ b/composer.json
@@ -21,13 +21,13 @@
         }
     ],
     "require": {
-        "php": ">=7.4 <8.4",
+        "php": ">=7.4",
         "ext-json": "*",
         "psr/container": "^1.1.0 || ^2"
     },
     "require-dev": {
         "brain/monkey": "^2.6.1",
-        "inpsyde/wp-stubs-versions": "dev-latest",
+        "inpsyde/wp-stubs-versions": "6.7",
         "mikey179/vfsstream": "^v1.6.11",
         "phpstan/phpstan": "^2.1.1",
         "phpstan/phpstan-deprecation-rules": "^2.0.1",
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index d8320c0..0f92929 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -8,7 +8,7 @@ parameters:
     dynamicConstantNames:
         - WP_DEBUG
     scanFiles:
-        - vendor/inpsyde/wp-stubs-versions/latest.php
+        - vendor/inpsyde/wp-stubs-versions/6.7.php
     paths:
         - src/
         - tests/
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 0f556dd..be947cc 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -9,7 +9,8 @@
     convertWarningsToExceptions="true"
     convertDeprecationsToExceptions="false"
     backupGlobals="false"
-    stopOnFailure="false">
+    stopOnFailure="false"
+    failOnWarning="false">
 
     <php>
         <ini name="error_reporting" value="E_ALL"/>