diff --git a/Dockerfile b/Dockerfile
index dc9a09b..a38dd75 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Which versions?
-ARG PHP_VERSION=8.1.29
+ARG PHP_VERSION=8.3.10
 ARG REDIS_EXT_VERSION=6.0.2
 ARG IMAGICK_EXT_VERSION=3.7.0
 ARG PCOV_EXT_VERSION=1.0.11
@@ -33,9 +33,9 @@ RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-he
 
 # Install PHP
 RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/php-$PHP_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20210902/redis-$REDIS_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20210902/imagick-$IMAGICK_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20210902/pcov-$PCOV_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20230831/redis-$REDIS_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20230831/imagick-$IMAGICK_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/extensions/no-debug-non-zts-20230831/pcov-$PCOV_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
 
 # Install Composer
 RUN curl --silent --location https://lang-php.s3.us-east-1.amazonaws.com/dist-heroku-22-stable/composer-$COMPOSER_VERSION.tar.gz | tar xz -C /app/.heroku/php
@@ -67,9 +67,9 @@ RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.c
 
 # Install PHP
 RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/php-$PHP_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20210902/redis-$REDIS_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20210902/imagick-$IMAGICK_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
-RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20210902/pcov-$PCOV_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20230831/redis-$REDIS_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20230831/imagick-$IMAGICK_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
+RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/extensions/no-debug-non-zts-20230831/pcov-$PCOV_EXT_VERSION.tar.gz | tar xz -C /app/.heroku/php
 
 # Install Composer
 RUN curl --silent --location https://robuust-heroku-php.s3.eu-west-1.amazonaws.com/dist-heroku-22-develop/composer-$COMPOSER_VERSION.tar.gz | tar xz -C /app/.heroku/php
diff --git a/README.md b/README.md
index cdae641..2342f0a 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Usage: `FROM ghcr.io/robuust/heroku-php`
 * Heroku 22
 * Apache
 * Nginx
-* PHP 8.1.x with Redis, Imagick and PCov
+* PHP 8.3.x with Redis, Imagick and PCov
 * Composer 2
 * Node 20.x
 * Yarn