diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 23c6e3c..bac21a3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,14 +18,6 @@ jobs:
       matrix:
         include:
           # MySQL 5.7
-          - os: ubuntu-20.04
-            database: 'mysql'
-            database-version: '5.7'
-            php-version: '7.4'
-          - os: ubuntu-20.04
-            database: 'mysql'
-            database-version: '5.7'
-            php-version: '8.0'
           - os: ubuntu-20.04
             database: 'mysql'
             database-version: '5.7'
@@ -39,14 +31,6 @@ jobs:
             database-version: '5.7'
             php-version: '8.3'
           # MySQL 8.0
-          - os: ubuntu-latest
-            database: 'mysql'
-            database-version: '8.0'
-            php-version: '7.4'
-          - os: ubuntu-latest
-            database: 'mysql'
-            database-version: '8.0'
-            php-version: '8.0'
           - os: ubuntu-latest
             database: 'mysql'
             database-version: '8.0'
@@ -60,14 +44,6 @@ jobs:
             database-version: '8.0'
             php-version: '8.3'
           # MariaDB 10.11 LTS
-          - os: ubuntu-20.04
-            database: 'mariadb'
-            database-version: '10.11'
-            php-version: '7.4'
-          - os: ubuntu-20.04
-            database: 'mariadb'
-            database-version: '10.11'
-            php-version: '8.0'
           - os: ubuntu-20.04
             database: 'mariadb'
             database-version: '10.11'
diff --git a/Dockerfile b/Dockerfile
index b1dac9d..241b1ad 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,10 @@ FROM druidfi/php:8.2 as php-82
 
 RUN sudo apk --update -X https://dl-cdn.alpinelinux.org/alpine/edge/community --no-cache add php82-pdo php82-pdo_mysql
 
+FROM druidfi/php:8.3 as php-83
+
+RUN sudo apk --update -X https://dl-cdn.alpinelinux.org/alpine/edge/community --no-cache add php82-pdo php82-pdo_mysql
+
 FROM php-${PHP_SHORT_VERSION}
 
 RUN sudo apk --update --no-cache add bash mysql-client \
diff --git a/README.md b/README.md
index 27cba71..3f64bef 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Out of the box, `mysqldump-php` supports backing up table structures, the data i
 
 ## Requirements
 
-- PHP 7.4 or 8.x with PDO - [see supported versions](https://www.php.net/supported-versions.php)
+- PHP 8.x with PDO - [see supported versions](https://www.php.net/supported-versions.php)
 - MySQL 5.7 or newer (and compatible MariaDB)
 
 ## Installing
diff --git a/composer.json b/composer.json
index dcbb9a2..100f3e2 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "druidfi/mysqldump-php",
     "description": "PHP version of mysqldump cli that comes with MySQL",
     "type": "library",
-    "keywords": ["mysql", "mysqldump", "pdo", "php7", "php8", "database", "php", "sql", "mariadb", "mysql-backup"],
+    "keywords": ["mysql", "mysqldump", "pdo", "php8", "database", "php", "sql", "mariadb", "mysql-backup"],
     "homepage": "https://github.com/druidfi/mysqldump-php",
     "license": "GPL-3.0-or-later",
     "minimum-stability": "stable",
@@ -18,13 +18,13 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "composer-runtime-api": "^2",
         "ext-pdo": "*"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "3.*",
-        "phpunit/phpunit": "^8.5.15 || ^9"
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
         "psr-4": {
diff --git a/docker-compose.yml b/docker-compose.yml
index 30a4f1a..dafd60d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: '3.7'
-
 services:
 
   db:
@@ -16,7 +14,7 @@ services:
 
   db3:
     container_name: "mysqldump-php-mariadb-80"
-    image: druidfi/mariadb:10.6-drupal
+    image: druidfi/mariadb:10.11-drupal-lts
     ports:
       - 3306