diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index 4eeef98..6cd8e88 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -88,13 +88,20 @@ jobs:
                 run: phpstan analyse src/
 
     tests:
-        name: "Tests (PHP ${{ matrix.php-version }})"
+        name: "Tests (PHP ${{ matrix.php-version }}, ${{ matrix.dependency-versions }} deps)"
         runs-on: ubuntu-latest
         strategy:
-            matrix:
-                php-version:
-                    - '8.3'
             fail-fast: false
+            matrix:
+                include:
+                    -   php-version: '8.3'
+                        dependency-versions: 'lowest'
+                    -   php-version: '8.3'
+                        dependency-versions: 'highest'
+                    -   php-version: '8.4'
+                        dependency-versions: 'highest'
+                    -   php-version: '8.5'
+                        dependency-versions: 'highest'
         steps:
             -   name: "Git: Checkout"
                 uses: actions/checkout@v4
@@ -118,8 +125,12 @@ jobs:
                     restore-keys: ${{ runner.os }}-composer-
             -   name: "Composer: validate"
                 run: composer validate --strict
-            -   name: "Composer: install"
-                run: composer install --prefer-dist --no-progress --no-suggest
+            -   name: "Composer: update (lowest)"
+                if: matrix.dependency-versions == 'lowest'
+                run: composer update --prefer-lowest --prefer-dist --no-progress
+            -   name: "Composer: update (highest)"
+                if: matrix.dependency-versions == 'highest'
+                run: composer update --prefer-dist --no-progress
             -   name: "PHPUnit: version"
                 run: ./vendor/bin/phpunit --version
             -   name: "PHPUnit: tests"
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..4d94a9e
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+
+All notable changes to this project are documented in this file, following [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+## [Unreleased]
+
+### Added
+
+- Support for webmozart/assert 2.x
diff --git a/composer.json b/composer.json
index 997378f..29d1425 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     "require": {
         "php": ">=8.3",
         "symfony/http-client": "^7.0 || ^8.0",
-        "webmozart/assert": "^1.11"
+        "webmozart/assert": "^1.11 || ^2.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.56",