diff --git a/composer.json b/composer.json
index 89628d0827373cb4426f8427ee1ed4ef7f3f0bd8..f1ec9cc13cefe583e9505faf442ff0560b044f3d 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
         "preferred-install": "dist",
         "autoloader-suffix": "Drupal9",
         "platform": {
-            "php": "7.3.0"
+            "php": "8.0.0"
         }
     },
     "extra": {
diff --git a/composer.lock b/composer.lock
index f7c2660b0d05b8ac1b470dd5803007879219b6a8..775de9583fffd6a6532eab37c468a43a7940dd33 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "562b32f689c2ece1649aeb3c21d6bd11",
+    "content-hash": "ed658741b2245d9acf4ff93235a4eb7e",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -535,7 +535,7 @@
             "dist": {
                 "type": "path",
                 "url": "core",
-                "reference": "7c4cc1ffebefea56f52ade87488754039b71eaaa"
+                "reference": "17394ff082fb62eb55ce7d8f7cf5fa97f2d27a28"
             },
             "require": {
                 "asm89/stack-cors": "^1.1",
@@ -561,7 +561,7 @@
                 "laminas/laminas-feed": "^2.12",
                 "masterminds/html5": "^2.1",
                 "pear/archive_tar": "^1.4.14",
-                "php": ">=7.3.0",
+                "php": ">=8.0.0",
                 "psr/log": "^1.0",
                 "stack/builder": "^1.0",
                 "symfony-cmf/routing": "^2.1",
@@ -7077,7 +7077,6 @@
                     "type": "github"
                 }
             ],
-            "abandoned": true,
             "time": "2020-11-30T07:30:19+00:00"
         },
         {
@@ -8022,7 +8021,7 @@
     "platform": [],
     "platform-dev": [],
     "platform-overrides": {
-        "php": "7.3.0"
+        "php": "8.0.0"
     },
     "plugin-api-version": "2.1.0"
 }
diff --git a/core/INSTALL.txt b/core/INSTALL.txt
index 3ae63b882f145980875b00d6b2665abd28242032..721879d6d255f7fde57ba48ee774cd4ba3c7dd7e 100644
--- a/core/INSTALL.txt
+++ b/core/INSTALL.txt
@@ -15,7 +15,7 @@ QUICKSTART
 ----------------------
 
 Prerequisites:
-- PHP 7.3.0 (or greater) (https://php.net).
+- PHP 8.0.0 (or greater) (https://php.net).
 
 In the instructions below, replace the version x.y.z with the specific version
 you wish to download. Example: 8.6.0.zip. You can find the latest stable version
@@ -48,8 +48,7 @@ Drupal requires:
 - A web server with PHP support, for example:
   - Apache 2.4.7 (or greater) (http://httpd.apache.org/).
   - Nginx 1.1 (or greater) (http://nginx.com/).
-- PHP 7.3.0 (or greater) (http://php.net/). For better security support it is
-  recommended to update to at least 7.3.13.
+- PHP 8.0.0 (or greater) (http://php.net/).
 - One of the following databases:
   - MySQL 5.7.8 (or greater) (http://www.mysql.com/).
   - MariaDB 10.3.7 (or greater) (https://mariadb.org/). MariaDB is a fully
diff --git a/core/composer.json b/core/composer.json
index 45a4555f4a143df370bb0db898dc82ee1cf0fbcd..a7841051c4f7ce23cb775d3ee84d6ae25e7145cf 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -17,7 +17,7 @@
         "ext-SPL": "*",
         "ext-tokenizer": "*",
         "ext-xml": "*",
-        "php": ">=7.3.0",
+        "php": ">=8.0.0",
         "symfony/console": "^4.4",
         "symfony/dependency-injection": "^4.4",
         "symfony/event-dispatcher": "^4.4",
diff --git a/core/install.php b/core/install.php
index 422cc099c5a8382b8d4558b7a035cfd096c0df9f..347f027dac15c249e7c11801f651e582815cad58 100644
--- a/core/install.php
+++ b/core/install.php
@@ -29,8 +29,8 @@
 // hardcoded minimum PHP version below (both in the version_compare() call and
 // in the printed message to the user) whenever \Drupal::MINIMUM_PHP is
 // updated.
-if (version_compare(PHP_VERSION, '7.3.0') < 0) {
-  print 'Your PHP installation is too old. Drupal requires at least PHP 7.3.0. See the <a href="https://www.drupal.org/docs/9/how-drupal-9-is-made-and-what-is-included/environment-requirements-of-drupal-9#s-php-version-requirement">Environment requirements of Drupal 9</a> page for more information.';
+if (version_compare(PHP_VERSION, '8.0.0') < 0) {
+  print 'Your PHP installation is too old. Drupal requires at least PHP 8.0.0. See the <a href="https://www.drupal.org/docs/9/how-drupal-9-is-made-and-what-is-included/environment-requirements-of-drupal-9#s-php-version-requirement">Environment requirements of Drupal 9</a> page for more information.';
   exit;
 }
 
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index ca4295eb5df9530a9b9a5774575443005b68642c..604fad7e278a5c460f7bb423ac7885a611dffb79 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -96,7 +96,7 @@ class Drupal {
    *   that Drupal no longer supports that PHP version.
    * - An error is shown in the status report that the PHP version is too old.
    */
-  const MINIMUM_SUPPORTED_PHP = '7.3.0';
+  const MINIMUM_SUPPORTED_PHP = '8.0.0';
 
   /**
    * Minimum allowed version of PHP for Drupal to be bootstrapped.
@@ -114,7 +114,7 @@ class Drupal {
    * - Once in the error message printed to the user immediately after.
    * Remember to update both whenever this constant is updated.
    */
-  const MINIMUM_PHP = '7.3.0';
+  const MINIMUM_PHP = '8.0.0';
 
   /**
    * Minimum recommended value of PHP memory_limit.