diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f42158..bf82b4e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ ubuntu-latest ]
-        php-versions: [ '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
         psr-http-versions: [ '~1.0.0', '^1', '^2' ]
         exclude:
           - php-versions: '7.3'
diff --git a/composer.json b/composer.json
index 7986ec2..2a9d368 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
 	"type": "library",
 	"require": {
 		"psr/http-message": "^1 || ^2",
-		"php": ">=7.3"
+		"php": ">=7.4"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^9.6.19",
@@ -15,7 +15,7 @@
 		"friendsofphp/php-cs-fixer": "^3.4",
 		"donatj/mddoc": "^0.10.1",
 		"donatj/drop": "^1.1",
-		"phpstan/phpstan": "^1.12"
+		"phpstan/phpstan": "^2.1.18"
 	},
 	"license": "MIT",
 	"authors": [
diff --git a/src/ProxyAwareSchemer.php b/src/ProxyAwareSchemer.php
index 3f93e7e..099c9a8 100644
--- a/src/ProxyAwareSchemer.php
+++ b/src/ProxyAwareSchemer.php
@@ -20,7 +20,7 @@
  */
 class ProxyAwareSchemer {
 
-	/** @var array<string,scalar> */
+	/** @var array<string,mixed> */
 	private $server;
 
 	public const HTTPS_EXPECTED_SERVER_VALUES = [
@@ -46,7 +46,7 @@ class ProxyAwareSchemer {
 	private $proxyServerPortKeys;
 
 	/**
-	 * @param array<string,scalar> $server Server array to inspect. Defaults to $_SERVER.
+	 * @param array<string,mixed> $server Server array to inspect. Defaults to $_SERVER.
 	 *
 	 * @param array<string,string>|null $proxyServerHttpsKeyValues Map of $_SERVER keys to their expected https-positive value.
 	 *                                                             Defaults to ProxyAwareSchemer::HTTPS_EXPECTED_SERVER_VALUES