diff --git a/README.md b/README.md
index 79eb5c8..6bcd4b9 100644
--- a/README.md
+++ b/README.md
@@ -136,7 +136,7 @@ multiple rows or cells by direct access (`$x->readString($worksheetId, 'A1')`, e
 
 ## Requirements
 
-PHP 7.4+ with ZIP and XML extensions.
+PHP 8.0+ with ZIP and XML extensions.
 Check [`composer.json`](./composer.json) for details.
 
 ## Credits
diff --git a/composer.json b/composer.json
index 2879154..e2a44ab 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
 		}
 	],
 	"require": {
-		"php": ">=7.4",
+		"php": ">=8.0",
 		"ext-ctype": "*",
 		"ext-dom": "*",
 		"ext-xml": "*",
diff --git a/composer.lock b/composer.lock
index 0273d4e..71ee70f 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": "dd26af2e8cd8c0739974fdd39e411b3c",
+    "content-hash": "00d622a050a6f3658a91afd00bfb08f9",
     "packages": [],
     "packages-dev": [
         {
@@ -200,7 +200,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.4",
+        "php": ">=8.0",
         "ext-ctype": "*",
         "ext-dom": "*",
         "ext-xml": "*",
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index e502256..2d271a6 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -1,6 +1,6 @@
 parameters:
 	phpVersion:
-		min: 70400	# PHP 7.4
+		min: 80000	# PHP 8.0
 		max: 80499	# PHP 8.4
 	level: 10	# https://phpstan.org/user-guide/rule-levels
 	fileExtensions: