diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0b01193..893cfde 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        php: [8.1, 8.2, 8.3]
+        php: [8.2, 8.3]
         dependencies: [lowest, highest]
         experimental: [false]
     name: 👷 CI PHP-${{ matrix.php }} ${{ matrix.dependencies }} on ${{ matrix.os }}
diff --git a/composer.json b/composer.json
index ce0d979..d44d275 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "chat": "https://github.com/orgs/sikessem/discussions"
     },
     "require": {
-        "php": "^8.1||^8.2||^8.3"
+        "php": "^8.2||^8.3"
     },
     "require-dev": {
         "sikessem/devtools": "^0.8.0"
diff --git a/composer.lock b/composer.lock
index 93b9a94..06e5a1a 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": "90fae9f5e8f0318ebf02df5617eb40db",
+    "content-hash": "7f4c735400b3b7339aab179d6bb7785f",
     "packages": [],
     "packages-dev": [
         {
@@ -9292,7 +9292,7 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": "^8.1||^8.2||^8.3"
+        "php": "^8.2||^8.3"
     },
     "platform-dev": [],
     "plugin-api-version": "2.6.0"
diff --git a/rector.php b/rector.php
index 19c6316..da0735d 100644
--- a/rector.php
+++ b/rector.php
@@ -17,7 +17,6 @@
 
     // define sets of rules
     $rectorConfig->sets([
-        LevelSetList::UP_TO_PHP_81,
         LevelSetList::UP_TO_PHP_82,
         LevelSetList::UP_TO_PHP_83,
     ]);