diff --git a/.travis.yml b/.travis.yml
index 962410b..5a74d67 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,8 +24,6 @@ matrix:
   include:
     - php: 7.4
       env: PHPCS=1
-    - php: 5.2
-      dist: precise
     - php: 5.3
       dist: precise
 
@@ -37,19 +35,16 @@ before_install:
   - phpenv config-rm xdebug.ini || echo 'No xdebug config.'
 
 install:
-- if [[ $TRAVIS_PHP_VERSION == "5.2" || $TRAVIS_PHP_VERSION == "5.3" ]]; then phpenv local 5.3.29; fi
-- if [[ $TRAVIS_PHP_VERSION == "5.2" || $TRAVIS_PHP_VERSION == "5.3" ]]; then composer remove --dev --no-update --no-scripts yoast/yoastcs; fi
-- if [[ $TRAVIS_PHP_VERSION == "5.2" ]]; then composer remove --dev --no-update --no-scripts phpunit/phpunit; fi
+- if [[ $TRAVIS_PHP_VERSION == "5.3" ]]; then phpenv local 5.3.29; fi
+- if [[ $TRAVIS_PHP_VERSION == "5.3" ]]; then composer remove --dev --no-update --no-scripts yoast/yoastcs; fi
 - if [[ $TRAVIS_PHP_VERSION != "nightly" ]]; then composer install --prefer-dist --no-interaction; fi
-- if [[ $TRAVIS_PHP_VERSION == "5.2" || $TRAVIS_PHP_VERSION == "5.3" ]]; then phpenv local --unset; fi
+- if [[ $TRAVIS_PHP_VERSION == "5.3" ]]; then phpenv local --unset; fi
 
 script:
 - echo $TRAVIS_PHP_VERSION
 - find -L . -path ./vendor -prune -o -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l
 - |
-  if [[ "$TRAVIS_PHP_VERSION" == "5.2" ]]; then
-    phpunit
-  elif [[ "$TRAVIS_PHP_VERSION" != "nightly" ]]; then
+  if [[ "$TRAVIS_PHP_VERSION" != "nightly" ]]; then
     ./vendor/bin/phpunit
   fi
 - if [[ "$TRAVIS_PHP_VERSION" == "5.3" || "$TRAVIS_PHP_VERSION" == "7.4" ]]; then composer validate --no-check-all; fi
diff --git a/README.md b/README.md
index 99f701c..9e118f9 100644
--- a/README.md
+++ b/README.md
@@ -7,13 +7,15 @@ A WordPress package to nudge users to upgrade their software versions (starting
 
 The following versions of PHP are supported:
 
-* PHP 5.2
 * PHP 5.3
 * PHP 5.4
 * PHP 5.5
 * PHP 5.6
 * PHP 7.0
 * PHP 7.1
+* PHP 7.2
+* PHP 7.3
+* PHP 7.4
 
 WordPress is also required for certain functionality:
 
@@ -35,7 +37,7 @@ whip_wp_check_versions( array(
 ) );
 ```
 
-This will show a message to all users of your plugin on PHP5.2 to PHP 5.5. By default the message will be shown on every page of the admin and to every user. It is up to the implementing plugin to restrict this to certain users and/or pages.
+This will show a message to all users of your plugin on PHP 5.3 to PHP 5.5. By default the message will be shown on every page of the admin and to every user. It is up to the implementing plugin to restrict this to certain users and/or pages.
 
 ### Adding a message as a host
 
diff --git a/composer.json b/composer.json
index 889825c..3496c5d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,32 +23,22 @@
         ]
     },
     "require": {
-        "php": ">=5.2",
-        "xrstf/composer-php52": "^1.0"
+        "php": ">=5.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^3.6.12 || ^4.5 || ^5.7 || ^6.0 || ^7.0",
+        "phpunit/phpunit": "^4.5 || ^5.7 || ^6.0 || ^7.0",
         "roave/security-advisories": "dev-master",
         "yoast/yoastcs": "^2.0.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {
-        "post-install-cmd": [
-            "xrstf\\Composer52\\Generator::onPostInstallCmd"
-        ],
-        "post-update-cmd": [
-            "xrstf\\Composer52\\Generator::onPostInstallCmd"
-        ],
-        "post-autoload-dump": [
-            "xrstf\\Composer52\\Generator::onPostInstallCmd"
-        ],
         "config-yoastcs" : [
             "Dealerdirect\\Composer\\Plugin\\Installers\\PHPCodeSniffer\\Plugin::run",
             "@php ./vendor/squizlabs/php_codesniffer/bin/phpcs --config-set default_standard Yoast"
         ],
         "check-cs": [
-            "@php ./vendor/squizlabs/php_codesniffer/bin/phpcs --runtime-set testVersion 5.2-"
+            "@php ./vendor/squizlabs/php_codesniffer/bin/phpcs --runtime-set testVersion 5.3-"
         ],
         "fix-cs": [
             "@php ./vendor/squizlabs/php_codesniffer/bin/phpcbf"
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 2522c33..f9bc6ef 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -21,8 +21,8 @@
 	class_alias( 'PHPUnit\Framework\TestCase', 'PHPUnit_Framework_TestCase' );
 }
 
-if ( file_exists( dirname( __FILE__ ) . '/../vendor/autoload_52.php' ) ) {
-	require_once dirname( __FILE__ ) . '/../vendor/autoload_52.php';
+if ( file_exists( dirname( __FILE__ ) . '/../vendor/autoload.php' ) ) {
+	require_once dirname( __FILE__ ) . '/../vendor/autoload.php';
 }
 else {
 	echo 'ERROR: Run `composer install` to generate the autoload files before running the unit tests.' . PHP_EOL;