diff --git a/composer.json b/composer.json
index 33d5173..e9a2db2 100644
--- a/composer.json
+++ b/composer.json
@@ -12,8 +12,8 @@
   ],
   "require": {
     "php": "^8.2",
-    "a9f/fractor": "^0.3",
-    "rector/rector": "^1.0",
+    "a9f/fractor": "^0.4",
+    "rector/rector": "^2.0",
     "symfony/config": "^6.4 || ^7.0",
     "symfony/console": "^6.4 || ^7.0",
     "symfony/dependency-injection": "^6.4 || ^7.0",
@@ -23,11 +23,11 @@
   },
   "require-dev": {
     "ergebnis/composer-normalize": "^2.42",
-    "phpstan/extension-installer": "^1.3",
-    "phpstan/phpstan": "^1.10",
+    "phpstan/extension-installer": "^1.4",
+    "phpstan/phpstan": "^2.0",
     "phpunit/phpunit": "^11.0",
     "symplify/easy-coding-standard": "^12.1",
-    "thecodingmachine/phpstan-safe-rule": "^1.2"
+    "thecodingmachine/phpstan-safe-rule": "^2.0-dev"
   },
   "autoload": {
     "psr-4": {
diff --git a/e2e/composer.json b/e2e/composer.json
index 0f49140..95d68c0 100644
--- a/e2e/composer.json
+++ b/e2e/composer.json
@@ -3,10 +3,10 @@
   "type": "project",
   "require": {
     "a9f/lifter": "@dev",
-    "a9f/fractor": "^0.3",
-    "a9f/fractor-composer-json": "^0.3",
-    "a9f/fractor-doc-generator": "^0.3",
-    "a9f/fractor-extension-installer": "^0.3",
+    "a9f/fractor": "^0.4",
+    "a9f/fractor-composer-json": "^0.4",
+    "a9f/fractor-doc-generator": "^0.4",
+    "a9f/fractor-extension-installer": "^0.4",
     "symplify/rule-doc-generator-contracts": "^11.2"
   },
   "require-dev": {
diff --git a/e2e/fractor/fractor.php b/e2e/fractor/fractor.php
index 61e6515..3682131 100644
--- a/e2e/fractor/fractor.php
+++ b/e2e/fractor/fractor.php
@@ -1,7 +1,6 @@
 <?php
 
-use a9f\Fractor\Configuration\FractorConfigurationBuilder;
+use a9f\Fractor\Configuration\FractorConfiguration;
 
-return static function (FractorConfigurationBuilder $fractorConfig) {
-    // no-op for now
-};
\ No newline at end of file
+return FractorConfiguration::configure()
+    ->withPaths([__DIR__ . '/result/**']);
\ No newline at end of file
diff --git a/e2e/fractor/lifter.php b/e2e/fractor/lifter.php
index 8711ed7..40133d9 100644
--- a/e2e/fractor/lifter.php
+++ b/e2e/fractor/lifter.php
@@ -17,13 +17,13 @@
         new FractorStep(
             'Update phpunit/phpunit to 11.x',
             static function (FractorConfigurationBuilder $fractorConfig) {
-                $fractorConfig->withPaths([__DIR__ . '/result/**']);
-                $fractorConfig->withConfiguredRule(
-                    ChangePackageVersionComposerJsonFractor::class,
-                    [
-                        new PackageAndVersion('phpunit/phpunit', '^11.2')
-                    ]
-                );
+                return $fractorConfig
+                    ->withConfiguredRule(
+                        ChangePackageVersionComposerJsonFractor::class,
+                        [
+                            new PackageAndVersion('phpunit/phpunit', '^11.2')
+                        ]
+                    );
             }
         )
     ]);
diff --git a/e2e/rector/expected-output.txt b/e2e/rector/expected-output.txt
index 632fde4..6d093dc 100644
--- a/e2e/rector/expected-output.txt
+++ b/e2e/rector/expected-output.txt
@@ -1,3 +1,3 @@
 RECTOR:
 RECTOR:  [OK] 1 file has been changed by Rector
-
+RECTOR:
diff --git a/phpstan.neon b/phpstan.neon
index fb53f61..df2971a 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -8,4 +8,6 @@ parameters:
 
     # this is required because of our generic interface StepExecutor that we use w/o specifying a concrete subtype,
     # e.g. in UpgradeRunner
-    checkGenericClassInNonGenericObjectType: false
+    ignoreErrors:
+        -
+            identifier: missingType.generics
diff --git a/res/run_fractor.php b/res/run_fractor.php
index e05981a..4a11068 100644
--- a/res/run_fractor.php
+++ b/res/run_fractor.php
@@ -4,7 +4,6 @@
 use a9f\Lifter\Configuration\LifterConfigFactory;
 use a9f\Lifter\Upgrade\Step\FractorStep;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
-use Webmozart\Assert\Assert;
 
 return static function (ContainerConfigurator $configurator) {
     $fractorConfig = FractorConfiguration::configure();
@@ -14,9 +13,7 @@
     if (!is_string($fractorConfigFile)) {
         throw new \RuntimeException('No file passed in env variable FRACTOR_CONFIG_FILE', 1712507292);
     }
-    $fractorConfigClosure = (require $fractorConfigFile);
-    Assert::isCallable($fractorConfigClosure, 'FRACTOR_CONFIG_FILE did not yield a callable');
-    $fractorConfigClosure($fractorConfig);
+    $fractorConfig->import($fractorConfigFile);
 
     $lifterConfigFile = getenv('LIFTER_CONFIG_FILE');
     if (!is_string($lifterConfigFile)) {
diff --git a/src/Upgrade/Step/FractorStepExecutor.php b/src/Upgrade/Step/FractorStepExecutor.php
index c9d3499..3c41fe4 100644
--- a/src/Upgrade/Step/FractorStepExecutor.php
+++ b/src/Upgrade/Step/FractorStepExecutor.php
@@ -56,11 +56,17 @@ public function run(int $index, UpgradeStep $step): void
             ],
             timeout: 3600
         );
-        $process->run(static function ($type, $data) {
+        $firstLine = true;
+        $process->run(static function ($type, $data) use (&$firstLine) {
             $data = trim($data);
 
             // TODO do we need to handle CRLF separately here?
             $lines = explode("\n", $data);
+            if (!$firstLine) {
+                echo array_shift($lines);
+            } else {
+                $firstLine = false;
+            }
             $lines = array_map(
                 static fn (string $line) => "FRACTOR: $line",
                 $lines
diff --git a/src/Upgrade/Step/RectorStepExecutor.php b/src/Upgrade/Step/RectorStepExecutor.php
index 0d11ef7..60d70cb 100644
--- a/src/Upgrade/Step/RectorStepExecutor.php
+++ b/src/Upgrade/Step/RectorStepExecutor.php
@@ -56,8 +56,22 @@ public function run(int $index, UpgradeStep $step): void
             ],
             timeout: 3600
         );
-        $process->run(static function ($type, $data) {
-            echo 'RECTOR: ' . $data;
+        $firstLine = true;
+        $process->run(static function ($type, $data) use (&$firstLine) {
+            $data = trim($data);
+
+            // TODO do we need to handle CRLF separately here?
+            $lines = explode("\n", $data);
+            if (!$firstLine) {
+                echo array_shift($lines);
+            } else {
+                $firstLine = false;
+            }
+            $lines = array_map(
+                static fn (string $line) => "RECTOR: $line",
+                $lines
+            );
+            echo implode("\n", $lines), "\n";
         });
     }
 }