diff --git a/composer.json b/composer.json
index 060b41d9d..a943cd7f9 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     "require": {
         "php": "^7.2.5 || ^8.0",
         "composer/ca-bundle": "^1.5",
-        "composer/class-map-generator": "^1.3.3",
+        "composer/class-map-generator": "^1.4.0",
         "composer/metadata-minifier": "^1.0",
         "composer/semver": "^3.3",
         "composer/spdx-licenses": "^1.5.7",
diff --git a/composer.lock b/composer.lock
index aa106a018..770ebda51 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": "d6685068b4f2660ec25263c8ecf9a367",
+    "content-hash": "7c2f8d4d04b8146b2fcd203cb81fa8d5",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -84,16 +84,16 @@
         },
         {
             "name": "composer/class-map-generator",
-            "version": "1.3.4",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/class-map-generator.git",
-                "reference": "b1b3fd0b4eaf3ddf3ee230bc340bf3fff454a1a3"
+                "reference": "98bbf6780e56e0fd2404fe4b82eb665a0f93b783"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/class-map-generator/zipball/b1b3fd0b4eaf3ddf3ee230bc340bf3fff454a1a3",
-                "reference": "b1b3fd0b4eaf3ddf3ee230bc340bf3fff454a1a3",
+                "url": "https://api.github.com/repos/composer/class-map-generator/zipball/98bbf6780e56e0fd2404fe4b82eb665a0f93b783",
+                "reference": "98bbf6780e56e0fd2404fe4b82eb665a0f93b783",
                 "shasum": ""
             },
             "require": {
@@ -106,8 +106,8 @@
                 "phpstan/phpstan-deprecation-rules": "^1",
                 "phpstan/phpstan-phpunit": "^1",
                 "phpstan/phpstan-strict-rules": "^1.1",
-                "symfony/filesystem": "^5.4 || ^6",
-                "symfony/phpunit-bridge": "^5"
+                "phpunit/phpunit": "^8",
+                "symfony/filesystem": "^5.4 || ^6"
             },
             "type": "library",
             "extra": {
@@ -137,7 +137,7 @@
             ],
             "support": {
                 "issues": "https://github.com/composer/class-map-generator/issues",
-                "source": "https://github.com/composer/class-map-generator/tree/1.3.4"
+                "source": "https://github.com/composer/class-map-generator/tree/1.4.0"
             },
             "funding": [
                 {
@@ -153,7 +153,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-06-12T14:13:04+00:00"
+            "time": "2024-10-03T18:14:00+00:00"
         },
         {
             "name": "composer/metadata-minifier",
diff --git a/src/Composer/Autoload/AutoloadGenerator.php b/src/Composer/Autoload/AutoloadGenerator.php
index 2296a7eb1..86c9f184d 100644
--- a/src/Composer/Autoload/AutoloadGenerator.php
+++ b/src/Composer/Autoload/AutoloadGenerator.php
@@ -173,7 +173,7 @@ class AutoloadGenerator
      * @throws \Seld\JsonLint\ParsingException
      * @throws \RuntimeException
      */
-    public function dump(Config $config, InstalledRepositoryInterface $localRepo, RootPackageInterface $rootPackage, InstallationManager $installationManager, string $targetDir, bool $scanPsrPackages = false, ?string $suffix = null, ?Locker $locker = null)
+    public function dump(Config $config, InstalledRepositoryInterface $localRepo, RootPackageInterface $rootPackage, InstallationManager $installationManager, string $targetDir, bool $scanPsrPackages = false, ?string $suffix = null, ?Locker $locker = null, bool $strictAmbiguous = false)
     {
         if ($this->classMapAuthoritative) {
             // Force scanPsrPackages when classmap is authoritative
@@ -362,7 +362,12 @@ EOF;
         }
 
         $classMap = $classMapGenerator->getClassMap();
-        foreach ($classMap->getAmbiguousClasses() as $className => $ambiguousPaths) {
+        if ($strictAmbiguous) {
+            $ambiguousClasses = $classMap->getAmbiguousClasses(false);
+        } else {
+            $ambiguousClasses = $classMap->getAmbiguousClasses();
+        }
+        foreach ($ambiguousClasses as $className => $ambiguousPaths) {
             if (count($ambiguousPaths) > 1) {
                 $this->io->writeError(
                     '<warning>Warning: Ambiguous class resolution, "'.$className.'"'.
diff --git a/src/Composer/Command/DumpAutoloadCommand.php b/src/Composer/Command/DumpAutoloadCommand.php
index 2e3181a27..cc0d7bf80 100644
--- a/src/Composer/Command/DumpAutoloadCommand.php
+++ b/src/Composer/Command/DumpAutoloadCommand.php
@@ -124,7 +124,8 @@ EOT
             'composer',
             $optimize,
             null,
-            $composer->getLocker()
+            $composer->getLocker(),
+            $input->getOption('strict-ambiguous')
         );
         $numberOfClasses = count($classMap);
 
@@ -140,7 +141,7 @@ EOT
             return 1;
         }
 
-        if ($input->getOption('strict-ambiguous') && count($classMap->getAmbiguousClasses()) > 0) {
+        if ($input->getOption('strict-ambiguous') && count($classMap->getAmbiguousClasses(false)) > 0) {
             return 2;
         }