diff --git a/.github/workflows/coding-standard.yml b/.github/workflows/coding-standard.yml
index 19a1a5cb1..c21c77a13 100644
--- a/.github/workflows/coding-standard.yml
+++ b/.github/workflows/coding-standard.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest, windows-latest]
-        php-versions: ["8.0", "8.1", "8.2", "8.3"]
+        php-versions: ["8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Set git to use LF
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 481611107..280977796 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest, windows-latest]
-        php-versions: ["8.0", "8.1", "8.2", "8.3"]
+        php-versions: ["8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Set git to use LF
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 7e8d04270..c13d19714 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest, windows-latest]
-        php-versions: ["8.0", "8.1", "8.2", "8.3"]
+        php-versions: ["8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Set git to use LF
diff --git a/.phan/config.php b/.phan/config.php
index 665b102f6..3f0142836 100644
--- a/.phan/config.php
+++ b/.phan/config.php
@@ -4,8 +4,8 @@
 
 use Phan\Issue;
 
-/*
- * This configuration file was automatically generated by 'phan --init --init-level=1'
+/**
+ * This configuration file was automatically generated by 'phan --init --init-level=3'
  *
  * TODOs (added by 'phan --init'):
  *
@@ -37,21 +37,22 @@
  * '-d' flag.
  */
 return [
+
     // The PHP version that the codebase will be checked for compatibility against.
     // For best results, the PHP binary used to run Phan should have the same PHP version.
     // (Phan relies on Reflection for some types, param counts,
     // and checks for undefined classes/methods/functions)
     //
     // Supported values: `'5.6'`, `'7.0'`, `'7.1'`, `'7.2'`, `'7.3'`, `'7.4'`,
-    // `'8.0'`, `'8.1'`, `null`.
+    // `'8.0'`, `'8.1'`, `'8.2'`, `'8.3'`, `null`.
     // If this is set to `null`,
     // then Phan assumes the PHP version which is closest to the minor version
     // of the php executable used to execute Phan.
     //
     // Note that the **only** effect of choosing `'5.6'` is to infer that functions removed in php 7.0 exist.
     // (See `backward_compatibility_checks` for additional options)
-    // Automatically inferred from composer.json requirement for "php" of "^7.4 || ^8.0"
-    'target_php_version' => '8.0',
+    // Automatically inferred from composer.json requirement for "php" of ">=8.1"
+    'target_php_version' => '8.1',
 
     // If enabled, missing properties will be created when
     // they are first seen. If false, we'll report an
@@ -162,7 +163,7 @@
     // If true, check to make sure the return type declared
     // in the doc-block (if any) matches the return type
     // declared in the method signature.
-    'check_docblock_signature_return_type_match' => true,
+    'check_docblock_signature_return_type_match' => false,
 
     // This setting maps case-insensitive strings to union types.
     //
@@ -350,8 +351,13 @@
     // Thus, both first-party and third-party code being used by
     // your application should be included in this list.
     'directory_list' => [
-      'src',
-      'examples'
+        'src/Yasumi',
+        'vendor/azuyalabs/php-cs-fixer-config/src',
+        'vendor/mikey179/vfsstream/src/main/php',
+        'vendor/phan/phan/src/Phan',
+        'vendor/phpstan/phpstan-deprecation-rules/src',
+        'vendor/phpunit/phpunit/src',
+        'vendor/vimeo/psalm/src/Psalm',
     ],
 
     // A list of individual files to include in analysis
diff --git a/composer.json b/composer.json
index 39c377374..9d1f4b777 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
     }
   ],
   "require": {
-    "php": ">=8.0",
+    "php": ">=8.1",
     "ext-json": "*"
   },
   "require-dev": {
diff --git a/psalm.xml.dist b/psalm.xml.dist
index de8c600a6..78205c464 100644
--- a/psalm.xml.dist
+++ b/psalm.xml.dist
@@ -21,9 +21,10 @@
     </projectFiles>
 
     <issueHandlers>
-      <MethodSignatureMismatch errorLevel="suppress" />
-      <MissingTemplateParam errorLevel="suppress" />
-      <InvalidArrayOffset errorLevel="suppress" />
+      <MissingTemplateParam errorLevel="info" />
+      <PossiblyUnusedMethod errorLevel="info" />
+      <UnusedClass errorLevel="info" />
+      <UnusedMethodCall errorLevel="info" />
     </issueHandlers>
 
 </psalm>
diff --git a/rector.php b/rector.php
index 427060761..634334c88 100644
--- a/rector.php
+++ b/rector.php
@@ -33,7 +33,7 @@
         SetList::CODE_QUALITY,
         SetList::DEAD_CODE,
         SetList::EARLY_RETURN,
-        SetList::PHP_80,
+        SetList::PHP_81,
         SetList::TYPE_DECLARATION,
     ]);
 };