diff --git a/build/binary-phar-autoload.php.in b/build/binary-phar-autoload.php.in
index 90d84bbe085..51686fbf34f 100644
--- a/build/binary-phar-autoload.php.in
+++ b/build/binary-phar-autoload.php.in
@@ -5,7 +5,7 @@ if (version_compare('7.1.0', PHP_VERSION, '>')) {
         STDERR,
         sprintf(
             'PHPUnit X.Y.Z by Sebastian Bergmann and contributors.' . PHP_EOL . PHP_EOL .
-            'This version of PHPUnit is supported on PHP 7.1 and PHP 7.2.' . PHP_EOL .
+            'This version of PHPUnit is supported on PHP 7.1, PHP 7.2, and PHP 7.3.' . PHP_EOL .
             'You are using PHP %s (%s).' . PHP_EOL,
             PHP_VERSION,
             PHP_BINARY
diff --git a/phpunit b/phpunit
index ebea1ffb059..2b5749a8317 100755
--- a/phpunit
+++ b/phpunit
@@ -13,7 +13,7 @@ if (version_compare('7.1.0', PHP_VERSION, '>')) {
     fwrite(
         STDERR,
         sprintf(
-            'This version of PHPUnit is supported on PHP 7.1 and PHP 7.2.' . PHP_EOL .
+            'This version of PHPUnit is supported on PHP 7.1, PHP 7.2, and PHP 7.3.' . PHP_EOL .
             'You are using PHP %s (%s).' . PHP_EOL,
             PHP_VERSION,
             PHP_BINARY