diff --git a/.github/settings.yml b/.github/settings.yml
index 894ddc2c..344f5822 100644
--- a/.github/settings.yml
+++ b/.github/settings.yml
@@ -27,6 +27,9 @@ branches:
           - context: "Tests (8.2, highest)"
           - context: "Tests (8.2, locked)"
           - context: "Tests (8.2, lowest)"
+          - context: "Tests (8.3, highest)"
+          - context: "Tests (8.3, locked)"
+          - context: "Tests (8.3, lowest)"
         strict: false
       restrictions:
 
diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index d59302c9..afb772a6 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -431,6 +431,7 @@ jobs:
         php-version:
           - "8.1"
           - "8.2"
+          - "8.3"
 
         dependencies:
           - "lowest"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8249ada0..76fddc43 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ For a full diff see [`2.2.0...2.3.0`][2.2.0...2.3.0].
 ### Changed
 
 - Added support for installing extension as a PHAR ([#273]), by [@localheinz]
+- Added support for PHP 8.3 ([#340]), by [@localheinz]
 
 ## [`2.2.0`][2.2.0]
 
@@ -140,5 +141,6 @@ For a full diff see [`7afa59c...1.0.0`][7afa59c...1.0.0].
 [#243]: https://github.com/ergebnis/phpunit-slow-test-detector/pull/243
 [#272]: https://github.com/ergebnis/phpunit-slow-test-detector/pull/272
 [#273]: https://github.com/ergebnis/phpunit-slow-test-detector/pull/273
+[#340]: https://github.com/ergebnis/phpunit-slow-test-detector/pull/340
 
 [@localheinz]: https://github.com/localheinz
diff --git a/composer.json b/composer.json
index 862f765e..d239e5b0 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     "security": "https://github.com/ergebnis/phpunit-slow-test-detector/blob/main/.github/SECURITY.md"
   },
   "require": {
-    "php": "~8.1.0 || ~8.2.0",
+    "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
     "phpunit/phpunit": "^10.1.3"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index 5e8a356e..3f73ee0e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0ff14f08a6bf292cf7044f3de20ea818",
+    "content-hash": "176ada3d5b99ff0ad0850942c8a05f51",
     "packages": [
         {
             "name": "myclabs/deep-copy",
@@ -5443,11 +5443,11 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "~8.1.0 || ~8.2.0"
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0"
     },
     "platform-dev": [],
     "platform-overrides": {
         "php": "8.1.10"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }