diff --git a/src/Symfony/Bridge/ProxyManager/composer.json b/src/Symfony/Bridge/ProxyManager/composer.json
index 1c33be86ca..b34def8465 100644
--- a/src/Symfony/Bridge/ProxyManager/composer.json
+++ b/src/Symfony/Bridge/ProxyManager/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=7.1.3",
+        "composer/package-versions-deprecated": "^1.8",
         "symfony/dependency-injection": "^4.0|^5.0",
         "ocramius/proxy-manager": "~2.1"
     },