diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 36aff9e0..972c2c4d 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,20 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="4.16.1@aa7e400908833b10c0333861f86cd48c510b60eb">
+<files psalm-version="4.22.0@fc2c6ab4d5fa5d644d8617089f012f3bb84b8703">
   <file src="src/Command/NormalizeCommand.php">
-    <MixedArgument occurrences="9">
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-      <code>$composerFile</code>
-    </MixedArgument>
     <MixedAssignment occurrences="1">
       <code>$composerFile</code>
     </MixedAssignment>
+    <RedundantCondition occurrences="1"/>
+    <TypeDoesNotContainType occurrences="1"/>
   </file>
   <file src="test/Integration/Command/NormalizeCommand/AbstractTestCase.php">
     <MixedArrayAccess occurrences="1">
diff --git a/src/Command/NormalizeCommand.php b/src/Command/NormalizeCommand.php
index 507abbd6..f216e6b6 100644
--- a/src/Command/NormalizeCommand.php
+++ b/src/Command/NormalizeCommand.php
@@ -14,6 +14,7 @@
 namespace Ergebnis\Composer\Normalize\Command;
 
 use Composer\Command;
+use Composer\Composer;
 use Composer\Console\Application;
 use Composer\Factory;
 use Composer\IO;
@@ -132,7 +133,7 @@ protected function execute(
 
         $composerFile = $input->getArgument('file');
 
-        if (null === $composerFile) {
+        if (!\is_string($composerFile)) {
             $composerFile = Factory::getComposerFile();
         }
 
@@ -141,6 +142,10 @@ protected function execute(
             $composerFile,
         );
 
+        if (!$composer instanceof Composer) {
+            throw Exception\ShouldNotHappen::create();
+        }
+
         try {
             $indentFromExtra = self::indentFromExtra($composer->getPackage()->getExtra());
         } catch (\RuntimeException $exception) {