diff --git a/composer.json b/composer.json
index 221f3ac4d..d61cdb46f 100644
--- a/composer.json
+++ b/composer.json
@@ -47,7 +47,7 @@
     "process-timeout": 600,
     "sort-packages": true,
     "platform": {
-      "php": "7.4"
+      "php": "8.3"
     },
     "allow-plugins": {
       "composer/installers": true,
diff --git a/contributing.md b/contributing.md
index a401a4022..10b7e0511 100644
--- a/contributing.md
+++ b/contributing.md
@@ -106,7 +106,7 @@ We use npm as the canonical task runner for the project. The following commands
 - `npm run test-xdebug` will run the PHPunit tests with Xdebug enabled.
 - `npm run test-e2e` will run the Playwright E2E tests.
 - `npm run test-e2e-debug` will run the Playwright E2E tests in a debug mode (with Chromium browser and dev tools open).
-- `npm run switch-to:php7.4` and `npm run switch-to:php8.2` will switch you to either PHP 7.4 or PHP 8.2
+- `npm run switch-to:php7.4`, `npm run switch-to:php8.2`, and `npm run switch-to:php8.3` switch the WordPress container PHP version (default build is PHP 8.3)
 - `npm run document:connectors` generates [connectors.md](connectors.md). This runs via your local php.
 - `npm run large-records-generate` inserts ~1.6M rows to `wp_stream` and ~8.4M rows to `wp_streammeta` for testing
 - `npm run large-records-remove` removes the test data only
diff --git a/docker-compose.build.yml b/docker-compose.build.yml
index 9a475225b..c03e1e5fa 100644
--- a/docker-compose.build.yml
+++ b/docker-compose.build.yml
@@ -37,6 +37,14 @@ services:
         PHP_VERSION: "8.2"
         XDEBUG_VERSION: "3.2.1"
 
+  wordpress_php8.3:
+    image: ghcr.io/xwp/stream-wordpress:php8.3
+    build:
+      context: ./local/docker/wordpress
+      args:
+        PHP_VERSION: "8.3"
+        XDEBUG_VERSION: "3.3.2"
+
   # Helper image that generates a locally-trusted TLS cert via mkcert for
   # the Apache HTTPS vhost on the wordpress service. Pre-built and pushed
   # to ghcr.io so CI and contributors don't rebuild it on every fresh
diff --git a/local/docker/wordpress/Dockerfile b/local/docker/wordpress/Dockerfile
index f23f04d05..f76df8f7f 100644
--- a/local/docker/wordpress/Dockerfile
+++ b/local/docker/wordpress/Dockerfile
@@ -1,11 +1,11 @@
 # Keep in sync with the default value of XDEBUG_VERSION below!
-ARG PHP_VERSION=7.4
+ARG PHP_VERSION=8.3
 
 FROM wordpress:php${PHP_VERSION}-apache
 
-# The latest Xdebug version which supports PHP 7.4 is 3.1.6.
+# Xdebug 3.3.x supports PHP 8.3.
 # @link https://xdebug.org/docs/compat
-ARG XDEBUG_VERSION=3.1.6
+ARG XDEBUG_VERSION=3.3.2
 
 # Include our Composer vendor binary path into global path.
 ENV PATH="/var/www/html/wp-content/plugins/stream-src/vendor/bin:${PATH}"
diff --git a/package.json b/package.json
index 985422d7e..6c9b0795e 100644
--- a/package.json
+++ b/package.json
@@ -57,8 +57,9 @@
     "push-containers": "docker compose --file docker-compose.build.yml push",
     "start": "docker compose up --remove-orphans --detach",
     "start-xdebug": "XDEBUG_TRIGGER=1 docker compose up --remove-orphans --detach",
+    "switch-to:php8.3": "docker compose build --build-arg PHP_VERSION=8.3 --build-arg XDEBUG_VERSION=3.3.2 && npm run start",
     "switch-to:php8.2": "docker compose build --build-arg PHP_VERSION=8.2 --build-arg XDEBUG_VERSION=3.3.2 && npm run start",
-    "switch-to:php7.4": "docker compose build && npm run start",
+    "switch-to:php7.4": "docker compose build --build-arg PHP_VERSION=7.4 --build-arg XDEBUG_VERSION=3.1.6 && npm run start",
     "which-php": "npm run cli -- php --version",
     "document:connectors": "php ./local/scripts/generate-connector-docs.php",
     "stop": "docker compose down",