diff --git a/composer.json b/composer.json
index 3cfbac37a..217fa0163 100644
--- a/composer.json
+++ b/composer.json
@@ -74,7 +74,7 @@
         "cs-check": "phpcs",
         "cs-fix": "phpcbf",
         "stan": "phpstan analyse",
-        "stan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:~1.12.0 && mv composer.backup composer.json",
+        "stan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:~2.1.0 && mv composer.backup composer.json",
         "lowest": "validate-prefer-lowest",
         "lowest-setup": "composer update --prefer-lowest --prefer-stable --prefer-dist --no-interaction && cp composer.json composer.backup && composer require --dev dereuromark/composer-prefer-lowest && mv composer.backup composer.json",
         "test": "phpunit --colors=always"
diff --git a/src/Phinx/Db/Adapter/MysqlAdapter.php b/src/Phinx/Db/Adapter/MysqlAdapter.php
index 4009ddb9e..bb7da9dc5 100644
--- a/src/Phinx/Db/Adapter/MysqlAdapter.php
+++ b/src/Phinx/Db/Adapter/MysqlAdapter.php
@@ -1463,7 +1463,7 @@ protected function getColumnSqlDefinition(Column $column): string
         }
 
         $values = $column->getValues();
-        if ($values && is_array($values)) {
+        if ($values) {
             $def .= '(' . implode(', ', array_map(function ($value) {
                 // we special case NULL as it's not actually allowed an enum value,
                 // and we want MySQL to issue an error on the create statement, but
diff --git a/src/Phinx/Db/Table/Index.php b/src/Phinx/Db/Table/Index.php
index cea7b9520..87f8945f6 100644
--- a/src/Phinx/Db/Table/Index.php
+++ b/src/Phinx/Db/Table/Index.php
@@ -212,7 +212,7 @@ public function setOptions(array $options)
             }
 
             // handle $options['unique']
-            if (strcasecmp($option, self::UNIQUE) === 0) {
+            if ($option === self::UNIQUE) {
                 if ((bool)$value) {
                     $this->setType(self::UNIQUE);
                 }
diff --git a/src/Phinx/Migration/Manager.php b/src/Phinx/Migration/Manager.php
index 07c0a592a..b0d4a2b50 100644
--- a/src/Phinx/Migration/Manager.php
+++ b/src/Phinx/Migration/Manager.php
@@ -983,14 +983,8 @@ public function getSeeds(string $environment): array
                         $seed = new $class();
                     }
                     $seed->setEnvironment($environment);
-                    $input = $this->getInput();
-                    if ($input !== null) {
-                        $seed->setInput($input);
-                    }
-                    $output = $this->getOutput();
-                    if ($output !== null) {
-                        $seed->setOutput($output);
-                    }
+                    $seed->setInput($this->getInput());
+                    $seed->setOutput($this->getOutput());
 
                     if (!($seed instanceof AbstractSeed)) {
                         throw new InvalidArgumentException(sprintf(
diff --git a/src/Phinx/Migration/Manager/Environment.php b/src/Phinx/Migration/Manager/Environment.php
index 756206586..6181a383f 100644
--- a/src/Phinx/Migration/Manager/Environment.php
+++ b/src/Phinx/Migration/Manager/Environment.php
@@ -109,6 +109,14 @@ public function executeMigration(MigrationInterface $migration, string $directio
                     $migration->{MigrationInterface::CHANGE}();
                 }
             } else {
+                if (!method_exists($migration, $direction)) {
+                    throw new RuntimeException(sprintf(
+                        'Migration "%s" must define a %s() or %s() method.',
+                        get_class($migration),
+                        MigrationInterface::CHANGE,
+                        $direction,
+                    ));
+                }
                 $migration->{$direction}();
             }
         }
@@ -143,9 +151,7 @@ public function executeSeed(SeedInterface $seed): void
         }
 
         // Run the seeder
-        if (method_exists($seed, SeedInterface::RUN)) {
-            $seed->{SeedInterface::RUN}();
-        }
+        $seed->run();
 
         // commit the transaction if the adapter supports it
         if ($this->getAdapter()->hasTransactions()) {
diff --git a/src/Phinx/Seed/AbstractSeed.php b/src/Phinx/Seed/AbstractSeed.php
index d9cdc9df3..a42be0d8c 100644
--- a/src/Phinx/Seed/AbstractSeed.php
+++ b/src/Phinx/Seed/AbstractSeed.php
@@ -188,9 +188,7 @@ public function fetchAll(string $sql): array
     public function insert(string $table, array $data): void
     {
         // convert to table object
-        if (is_string($table)) {
-            $table = new Table($table, [], $this->getAdapter());
-        }
+        $table = new Table($table, [], $this->getAdapter());
         $table->insert($data)->save();
     }