diff --git a/.github/settings.yml b/.github/settings.yml
index f5f72a5f..3b587e77 100644
--- a/.github/settings.yml
+++ b/.github/settings.yml
@@ -103,6 +103,12 @@ rulesets:
               integration_id: 15368
             - context: 'Tests (PHP 8.4, Ubuntu & lowest dependencies)'
               integration_id: 15368
+            # @todo Enable once PHP 8.5 is stable
+            #- context: 'Tests (PHP 8.5, Ubuntu & highest dependencies)'
+            #  integration_id: 15368
+            #- context: 'Tests (PHP 8.5, Ubuntu & lowest dependencies)'
+            #  integration_id: 15368
+            # @todo Switch to PHP 8.5 once it's stable
             - context: 'Tests (PHP 8.4, macOS & highest dependencies)'
               integration_id: 15368
             - context: 'Tests (PHP 8.4, Windows & highest dependencies)'
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 6bc32fa3..0fe1536e 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-version: ["8.2", "8.3", "8.4"]
+        php-version: ["8.2", "8.3", "8.4", "8.5"]
         dependencies: ["highest", "lowest"]
         os: ["Ubuntu"]
         include:
@@ -30,6 +30,9 @@ jobs:
           - php-version: "8.4"
             dependencies: "highest"
             os: "Windows"
+          # @todo Remove once PHP 8.5 is stable
+          - php-version: "8.5"
+            experimental: true
     steps:
       - uses: actions/checkout@v5
         with:
@@ -49,6 +52,7 @@ jobs:
         uses: ramsey/composer-install@v3
         with:
           dependency-versions: ${{ matrix.dependencies }}
+          composer-options: ${{ matrix.experimental && '--ignore-platform-req=php+' }}
 
       # Run tests
       - name: Run tests