diff --git a/.docker/php-8.2/Dockerfile b/.docker/php-8.4/Dockerfile
similarity index 57%
rename from .docker/php-8.2/Dockerfile
rename to .docker/php-8.4/Dockerfile
index 7736432..217f027 100644
--- a/.docker/php-8.2/Dockerfile
+++ b/.docker/php-8.4/Dockerfile
@@ -1,7 +1,7 @@
 # Build with
-# docker buildx build --platform linux/arm64,linux/amd64 -t ghcr.io/digital-craftsman-de/ids-php-8.2:latest ./.docker/php-8.2 --push
+# docker buildx build --platform linux/arm64,linux/amd64 -t ghcr.io/digital-craftsman-de/ids-php-8.4:latest ./.docker/php-8.4 --push
 
-FROM php:8.2-fpm-alpine
+FROM php:8.4.0RC3-fpm-alpine
 
 RUN apk add --update \
     autoconf \
@@ -15,7 +15,19 @@ ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/do
 RUN chmod uga+x /usr/local/bin/install-php-extensions && sync
 
 # Debugging
-RUN install-php-extensions xdebug
+# XDebug is not yet compatible with PHP 8.4, therefore we need to build it from source. This will be replaced with the following line once XDebug is compatible with PHP 8.4:
+# RUN pecl install xdebug-3.4.0 && docker-php-ext-enable xdebug
+RUN apk add git
+#RUN apk add -U php8-dev --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing
+RUN git clone https://github.com/xdebug/xdebug.git \
+    && cd xdebug \
+    && phpize \
+    && ./configure \
+    && make \
+    && make install \
+    && cd .. \
+    && docker-php-ext-enable xdebug
+#RUN install-php-extensions xdebug
 
 # Ids package
 RUN install-php-extensions uuid
diff --git a/.docker/php-8.2/docker-php-ext-xdebug.ini b/.docker/php-8.4/docker-php-ext-xdebug.ini
similarity index 100%
rename from .docker/php-8.2/docker-php-ext-xdebug.ini
rename to .docker/php-8.4/docker-php-ext-xdebug.ini
diff --git a/.docker/php-8.2/php-fpm.conf b/.docker/php-8.4/php-fpm.conf
similarity index 100%
rename from .docker/php-8.2/php-fpm.conf
rename to .docker/php-8.4/php-fpm.conf
diff --git a/.docker/php-8.2/php.ini b/.docker/php-8.4/php.ini
similarity index 100%
rename from .docker/php-8.2/php.ini
rename to .docker/php-8.4/php.ini
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee405c9..73c3320 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,8 +2,8 @@ name: CI
 on: push
 jobs:
 
-  test-8-2:
-    name: "Tests on PHP 8.2"
+  test-8-3:
+    name: "Tests on PHP 8.3"
     runs-on: ubuntu-latest
     steps:
 
@@ -19,25 +19,25 @@ jobs:
       - name: Setup env
         run: cp .github/workflows/.env .env
 
-      - name: Cache PHP 8.2 dependencies
-        id: cache-php-8-2-dependencies
+      - name: Cache PHP 8.3 dependencies
+        id: cache-php-8-3-dependencies
         uses: actions/cache@v3
         env:
-          cache-name: cache-php-8-2-dependencies
+          cache-name: cache-php-8-3-dependencies
         with:
           path: |
             ~/.cache
             vendor
-          key: ${{ runner.os }}-php-8-2-cache-${{ hashFiles('composer.lock') }}
+          key: ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
           restore-keys: |
-            ${{ runner.os }}-php-8-2-cache-${{ hashFiles('composer.lock') }}
+            ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
 
       - name: Install
-        if: steps.cache-php-8-2-dependencies.outputs.cache-hit != 'true'
-        run: make install-8.2
+        if: steps.cache-php-8-3-dependencies.outputs.cache-hit != 'true'
+        run: make install-8.3
 
       - name: Run PHP tests
-        run: make php-8.2-tests-ci
+        run: make php-8.3-tests-ci
 
       - name: Upload to Codecov
         uses: codecov/codecov-action@v2
@@ -46,8 +46,8 @@ jobs:
           files: ./coverage.xml
           verbose: true
 
-  test-8-3:
-    name: "Tests on PHP 8.3"
+  test-8-4:
+    name: "Tests on PHP 8.4"
     runs-on: ubuntu-latest
     steps:
 
@@ -63,25 +63,25 @@ jobs:
       - name: Setup env
         run: cp .github/workflows/.env .env
 
-      - name: Cache PHP 8.3 dependencies
-        id: cache-php-8-3-dependencies
+      - name: Cache PHP 8.4 dependencies
+        id: cache-php-8-4-dependencies
         uses: actions/cache@v3
         env:
-          cache-name: cache-php-8-3-dependencies
+          cache-name: cache-php-8-4-dependencies
         with:
           path: |
             ~/.cache
             vendor
-          key: ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
+          key: ${{ runner.os }}-php-8-4-cache-${{ hashFiles('composer.lock') }}
           restore-keys: |
-            ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
+            ${{ runner.os }}-php-8-4-cache-${{ hashFiles('composer.lock') }}
 
       - name: Install
-        if: steps.cache-php-8-3-dependencies.outputs.cache-hit != 'true'
-        run: make install-8.3
+        if: steps.cache-php-8-4-dependencies.outputs.cache-hit != 'true'
+        run: make install-8.4
 
       - name: Run PHP tests
-        run: make php-8.3-tests-ci
+        run: make php-8.4-tests-ci
 
   mutation-testing:
     name: "Mutation tests"
@@ -100,18 +100,18 @@ jobs:
       - name: Setup env
         run: cp .github/workflows/.env .env
 
-      - name: Restore cache for PHP 8.3 dependencies
-        id: cache-php-8-3-dependencies
+      - name: Restore cache for PHP 8.4 dependencies
+        id: cache-php-8-4-dependencies
         uses: actions/cache/restore@v3
         with:
           path: |
             ~/.cache
             vendor
-          key: ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
+          key: ${{ runner.os }}-php-8-4-cache-${{ hashFiles('composer.lock') }}
 
       - name: Install
-        if: steps.cache-php-8-3-dependencies.outputs.cache-hit != 'true'
-        run: make install-8.3
+        if: steps.cache-php-8-4-dependencies.outputs.cache-hit != 'true'
+        run: make install-8.4
 
       - name: Run mutation testing
         run: make php-mutation-testing-ci
@@ -133,18 +133,18 @@ jobs:
       - name: Setup env
         run: cp .github/workflows/.env .env
 
-      - name: Restore cache for PHP 8.3 dependencies
-        id: cache-php-8-3-dependencies
+      - name: Restore cache for PHP 8.4 dependencies
+        id: cache-php-8-4-dependencies
         uses: actions/cache/restore@v3
         with:
           path: |
             ~/.cache
             vendor
-          key: ${{ runner.os }}-php-8-3-cache-${{ hashFiles('composer.lock') }}
+          key: ${{ runner.os }}-php-8-4-cache-${{ hashFiles('composer.lock') }}
 
       - name: Install
-        if: steps.cache-php-8-3-dependencies.outputs.cache-hit != 'true'
-        run: make install-8.3
+        if: steps.cache-php-8-4-dependencies.outputs.cache-hit != 'true'
+        run: make install-8.4
 
       - name: Run code validation
         run: make php-code-validation
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2106a59..0861659 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.4.0
+
+- Drop support for PHP 8.2.
+- Add support for PHP 8.4.
+
 ## 1.3.0
 
 - Added method `mapWithIdKeys(callable $mapFunction): array` to `IdList`.
diff --git a/Makefile b/Makefile
index bd10704..6562dc7 100644
--- a/Makefile
+++ b/Makefile
@@ -52,34 +52,34 @@ reset: .reset
 .PHONY: .reset
 .reset: .down .install .up
 
-## install			Install PHP dependencies with the default PHP version (8.3).
+## install			Install PHP dependencies with the default PHP version (8.4).
 .PHONY: .install
-install: install-8.3
-
-## install-8.2			Install PHP dependencies with PHP 8.2.
-.PHONY: install-8.2
-install-8.2:
-	docker compose run --rm php-8.2 composer install
+install: install-8.4
 
 ## install-8.3			Install PHP dependencies with PHP 8.3.
 .PHONY: install-8.3
 install-8.3:
 	docker compose run --rm php-8.3 composer install
 
-## php-cli			Enter a shell for the default PHP version (8.3).
-.PHONY: php-cli
-php-cli: php-8.3-cli
+## install-8.4			Install PHP dependencies with PHP 8.4.
+.PHONY: install-8.4
+install-8.4:
+	docker compose run --rm php-8.4 composer install
 
-## php-8.2-cli			Enter a shell for PHP 8.2.
-.PHONY: php-8.2-cli
-php-8.2-cli:
-	docker compose run --rm php-8.2 sh
+## php-cli			Enter a shell for the default PHP version (8.4).
+.PHONY: php-cli
+php-cli: php-8.4-cli
 
 ## php-8.3-cli			Enter a shell for PHP 8.3.
 .PHONY: php-8.3-cli
 php-8.3-cli:
 	docker compose run --rm php-8.3 sh
 
+## php-8.4-cli			Enter a shell for PHP 8.4.
+.PHONY: php-8.4-cli
+php-8.4-cli:
+	docker compose run --rm php-8.4 sh
+
 ##
 ## Tests and code validation
 ## -------------------------
@@ -91,60 +91,60 @@ verify: php-code-validation php-tests php-mutation-testing
 
 ## php-tests			Run the tests for all relevant PHP versions.
 .PHONY: php-tests
-php-tests: php-8.2-tests php-8.3-tests
+php-tests: php-8.3-tests php-8.4-tests
 
 ## php-tests-coverage			Run the tests for all relevant PHP versions including coverage report as HTML.
 .PHONY: php-tests-coverage
-php-tests-coverage: php-8.3-tests-html-coverage
-
-## php-8.2-tests			Run tests with PHP 8.2.
-.PHONY: php-8.2-tests
-php-8.2-tests:
-	docker compose run --rm php-8.2 ./vendor/bin/phpunit
+php-tests-coverage: php-8.4-tests-html-coverage
 
 ## php-8.3-tests			Run tests with PHP 8.3.
 .PHONY: php-8.3-tests
 php-8.3-tests:
 	docker compose run --rm php-8.3 ./vendor/bin/phpunit
 
-## php-8.2-tests-html-coverage	Run the tests with PHP 8.2 including coverage report as HTML.
-.PHONY: php-8.2-tests-html-coverage
-php-8.2-tests-html-coverage:
-	docker compose run --rm php-8.2 ./vendor/bin/phpunit --coverage-html ./coverage
+## php-8.4-tests			Run tests with PHP 8.4.
+.PHONY: php-8.4-tests
+php-8.4-tests:
+	docker compose run --rm php-8.4 ./vendor/bin/phpunit
 
 ## php-8.3-tests-html-coverage	Run the tests with PHP 8.3 including coverage report as HTML.
 .PHONY: php-8.3-tests-html-coverage
 php-8.3-tests-html-coverage:
 	docker compose run --rm php-8.3 ./vendor/bin/phpunit --coverage-html ./coverage
 
-## php-code-validation		Run code fixers and linters with default PHP version (8.2).
+## php-8.4-tests-html-coverage	Run the tests with PHP 8.4 including coverage report as HTML.
+.PHONY: php-8.4-tests-html-coverage
+php-8.4-tests-html-coverage:
+	docker compose run --rm php-8.4 ./vendor/bin/phpunit --coverage-html ./coverage
+
+## php-code-validation		Run code fixers and linters with default PHP version (8.3).
 .PHONY: php-code-validation
 php-code-validation:
-	docker compose run --rm php-8.2 ./vendor/bin/php-cs-fixer fix
-	docker compose run --rm php-8.2 ./vendor/bin/psalm --show-info=false --no-diff
-	docker compose run --rm php-8.2 ./vendor/bin/phpstan --xdebug
+	docker compose run --rm php-8.4 ./vendor/bin/php-cs-fixer fix
+	docker compose run --rm php-8.4 ./vendor/bin/psalm --show-info=false --no-diff
+	docker compose run --rm php-8.4 ./vendor/bin/phpstan --xdebug
 
-## php-mutation-testing		Run mutation testing with default PHP version (8.2).
+## php-mutation-testing		Run mutation testing with default PHP version (8.3).
 .PHONY: php-mutation-testing
 php-mutation-testing:
-	docker compose run --rm php-8.2 ./vendor/bin/infection --show-mutations --only-covered --threads=8
+	docker compose run --rm php-8.4 ./vendor/bin/infection --show-mutations --only-covered --threads=8
 
 ##
 ## CI
 ## --
 ##
 
-## php-8.2-tests-ci		Run the tests for PHP 8.2 for CI.
-.PHONY: php-8.2-tests-ci
-php-8.2-tests-ci:
-	docker compose run --rm php-8.2 ./vendor/bin/phpunit --coverage-clover ./coverage.xml
-
 ## php-8.3-tests-ci		Run the tests for PHP 8.3 for CI.
 .PHONY: php-8.3-tests-ci
 php-8.3-tests-ci:
-	docker compose run --rm php-8.3 ./vendor/bin/phpunit
+	docker compose run --rm php-8.3 ./vendor/bin/phpunit --coverage-clover ./coverage.xml
+
+## php-8.4-tests-ci		Run the tests for PHP 8.4 for CI.
+.PHONY: php-8.4-tests-ci
+php-8.4-tests-ci:
+	docker compose run --rm php-8.4 ./vendor/bin/phpunit
 
 ## php-mutation-testing-ci	Run mutation testing for CI.
 .PHONY: php-mutation-testing-ci
 php-mutation-testing-ci:
-	docker compose run --rm php-8.2 ./vendor/bin/infection --only-covered --threads=max
+	docker compose run --rm php-8.4 ./vendor/bin/infection --only-covered --threads=max
diff --git a/README.md b/README.md
index 5d970c7..14b6e77 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ A Symfony bundle to work with id and id list value objects in Symfony. It includ
 As it's a central part of an application, it's tested thoroughly (including mutation testing).
 
 [![Latest Stable Version](https://img.shields.io/badge/stable-1.3.0-blue)](https://packagist.org/packages/digital-craftsman/ids)
-[![PHP Version Require](https://img.shields.io/badge/php-8.2|8.3-5b5d95)](https://packagist.org/packages/digital-craftsman/ids)
+[![PHP Version Require](https://img.shields.io/badge/php-8.3|8.4-5b5d95)](https://packagist.org/packages/digital-craftsman/ids)
 [![codecov](https://codecov.io/gh/digital-craftsman-de/ids/branch/main/graph/badge.svg?token=BL0JKZYLBG)](https://codecov.io/gh/digital-craftsman-de/ids)
 ![Packagist Downloads](https://img.shields.io/packagist/dt/digital-craftsman/ids)
 ![Packagist License](https://img.shields.io/packagist/l/digital-craftsman/ids)
diff --git a/UPGRADE.md b/UPGRADE.md
index 9e9d743..77ff85d 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,5 +1,11 @@
 # Upgrade guide
 
+## From 1.3.* to 1.4.0
+
+### Upgrade to at least PHP 8.3
+
+Support for PHP 8.2 was dropped, so you have to upgrade to at least PHP 8.3.
+
 ## From 1.2.* to 1.3.0
 
 Nothing to do.
diff --git a/composer.json b/composer.json
index 184769d..e92e778 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
   "description": "Working with value objects for ids in Symfony",
   "type": "symfony-bundle",
   "require": {
-    "php": "8.2.*|8.3.*",
+    "php": "8.3.*|8.4.*",
     "symfony/framework-bundle": "^6.3|^7.0",
     "symfony/serializer": "^6.3|^7.0",
     "doctrine/dbal": "^2.13.8|^3.3.6",
diff --git a/docker-compose.yml b/docker-compose.yml
index 913ac1e..a0fa248 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 services:
 
-  php-8.2:
-    image: ghcr.io/digital-craftsman-de/ids-php-8.2
+  php-8.3:
+    image: ghcr.io/digital-craftsman-de/ids-php-8.3
     env_file:
       - .env
     volumes:
@@ -9,8 +9,8 @@ services:
     extra_hosts:
       - "host.docker.internal:host-gateway"
 
-  php-8.3:
-    image: ghcr.io/digital-craftsman-de/ids-php-8.3
+  php-8.4:
+    image: ghcr.io/digital-craftsman-de/ids-php-8.4
     env_file:
       - .env
     volumes: