diff --git a/CHANGELOG.md b/CHANGELOG.md
index edab644..431c678 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 0.2.0 (unreleased)
 
 - Changed `Distance` to enum
+- Dropped support for PHP < 8.1
 
 ## 0.1.4 (2023-11-14)
 
diff --git a/composer.json b/composer.json
index a451e88..13f315b 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         }
     },
     "require": {
-        "php": ">= 7.4"
+        "php": ">= 8.1"
     },
     "require-dev": {
         "phpunit/phpunit": "^10",
diff --git a/src/Vector.php b/src/Vector.php
index c7a17d5..7405dd7 100644
--- a/src/Vector.php
+++ b/src/Vector.php
@@ -20,8 +20,7 @@ public function __construct($value)
             }
         }
 
-        // TODO use array_is_list when PHP < 8.1 no longer supported
-        if (!is_array($value)) {
+        if (!is_array($value) || !array_is_list($value)) {
             throw new \InvalidArgumentException("Expected array");
         }