diff --git a/composer.json b/composer.json
index 3dc1a2165..6e2c31bfa 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
     "require": {
         "php": "^5.3.2 || ^7.0 || ^8.0",
         "composer/ca-bundle": "^1.0",
+        "composer/metadata-minifier": "^1.0",
         "composer/semver": "^3.0",
         "composer/spdx-licenses": "^1.2",
         "composer/xdebug-handler": "^1.1",
diff --git a/composer.lock b/composer.lock
index 8acac0375..b2cdb5b23 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": "25f0d90eaaae2900e23844f74e662e82",
+    "content-hash": "5275194a1c51ef2f95f92838cc728abc",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -82,6 +82,75 @@
             ],
             "time": "2021-01-12T12:10:35+00:00"
         },
+        {
+            "name": "composer/metadata-minifier",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/metadata-minifier.git",
+                "reference": "c549d23829536f0d0e984aaabbf02af91f443207"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/metadata-minifier/zipball/c549d23829536f0d0e984aaabbf02af91f443207",
+                "reference": "c549d23829536f0d0e984aaabbf02af91f443207",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0 || ^8.0"
+            },
+            "require-dev": {
+                "composer/composer": "^2",
+                "phpstan/phpstan": "^0.12.55",
+                "symfony/phpunit-bridge": "^4.2 || ^5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\MetadataMinifier\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "Small utility library that handles metadata minification and expansion.",
+            "keywords": [
+                "composer",
+                "compression"
+            ],
+            "support": {
+                "issues": "https://github.com/composer/metadata-minifier/issues",
+                "source": "https://github.com/composer/metadata-minifier/tree/1.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-04-07T13:37:33+00:00"
+        },
         {
             "name": "composer/semver",
             "version": "3.2.4",
@@ -244,16 +313,16 @@
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "1.4.5",
+            "version": "1.4.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "f28d44c286812c714741478d968104c5e604a1d4"
+                "reference": "f27e06cd9675801df441b3656569b328e04aa37c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/f28d44c286812c714741478d968104c5e604a1d4",
-                "reference": "f28d44c286812c714741478d968104c5e604a1d4",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/f27e06cd9675801df441b3656569b328e04aa37c",
+                "reference": "f27e06cd9675801df441b3656569b328e04aa37c",
                 "shasum": ""
             },
             "require": {
@@ -261,7 +330,8 @@
                 "psr/log": "^1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8"
+                "phpstan/phpstan": "^0.12.55",
+                "symfony/phpunit-bridge": "^4.2 || ^5"
             },
             "type": "library",
             "autoload": {
@@ -287,7 +357,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/xdebug-handler/issues",
-                "source": "https://github.com/composer/xdebug-handler/tree/1.4.5"
+                "source": "https://github.com/composer/xdebug-handler/tree/1.4.6"
             },
             "funding": [
                 {
@@ -303,7 +373,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-13T08:04:11+00:00"
+            "time": "2021-03-25T17:01:18+00:00"
         },
         {
             "name": "justinrainbow/json-schema",
diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index 49e0e5b90..308972309 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -35,7 +35,7 @@ use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Constraint\Constraint;
 use Composer\Semver\Constraint\MatchAllConstraint;
 use Composer\Util\Http\Response;
-use Composer\Util\MetadataMinifier;
+use Composer\MetadataMinifier\MetadataMinifier;
 use Composer\Util\Url;
 
 /**
@@ -510,7 +510,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         return array();
     }
 
-    private function configurePackageTransportOptions(PackageInterface $package)
+    protected function configurePackageTransportOptions(PackageInterface $package)
     {
         foreach ($package->getDistUrls() as $url) {
             if (strpos($url, $this->baseUrl) === 0) {
diff --git a/src/Composer/Util/MetadataMinifier.php b/src/Composer/Util/MetadataMinifier.php
index ba4cc0a93..6fae871c3 100644
--- a/src/Composer/Util/MetadataMinifier.php
+++ b/src/Composer/Util/MetadataMinifier.php
@@ -12,67 +12,11 @@
 
 namespace Composer\Util;
 
-class MetadataMinifier
+@trigger_error('Composer\Util\MetadataMinifier is deprecated, use Composer\MetadataMinifier\MetadataMinifier from composer/metadata-minifier instead.', E_USER_DEPRECATED);
+
+/**
+ * @deprecated Use Composer\MetadataMinifier\MetadataMinifier instead
+ */
+class MetadataMinifier extends \Composer\MetadataMinifier\MetadataMinifier
 {
-    public static function expand(array $versions)
-    {
-        $expanded = array();
-        $expandedVersion = null;
-        foreach ($versions as $versionData) {
-            if (!$expandedVersion) {
-                $expandedVersion = $versionData;
-                $expanded[] = $expandedVersion;
-                continue;
-            }
-
-            // add any changes from the previous version to the expanded one
-            foreach ($versionData as $key => $val) {
-                if ($val === '__unset') {
-                    unset($expandedVersion[$key]);
-                } else {
-                    $expandedVersion[$key] = $val;
-                }
-            }
-
-            $expanded[] = $expandedVersion;
-        }
-
-        return $expanded;
-    }
-
-    public static function minify(array $versions)
-    {
-        $minifiedVersions = array();
-
-        $lastKnownVersionData = null;
-        foreach ($versions as $version) {
-            if (!$lastKnownVersionData) {
-                $lastKnownVersionData = $version;
-                $minifiedVersions[] = $version;
-                continue;
-            }
-
-            $minifiedVersion = array();
-
-            // add any changes from the previous version
-            foreach ($version as $key => $val) {
-                if (!isset($lastKnownVersionData[$key]) || $lastKnownVersionData[$key] !== $val) {
-                    $minifiedVersion[$key] = $val;
-                    $lastKnownVersionData[$key] = $val;
-                }
-            }
-
-            // store any deletions from the previous version for keys missing in current one
-            foreach ($lastKnownVersionData as $key => $val) {
-                if (!isset($version[$key])) {
-                    $minifiedVersion[$key] = "__unset";
-                    unset($lastKnownVersionData[$key]);
-                }
-            }
-
-            $minifiedVersions[] = $minifiedVersion;
-        }
-
-        return $minifiedVersions;
-    }
 }