diff --git a/src/Composer/Plugin/PluginManager.php b/src/Composer/Plugin/PluginManager.php
index 0b5800e2d..17c3dbc50 100644
--- a/src/Composer/Plugin/PluginManager.php
+++ b/src/Composer/Plugin/PluginManager.php
@@ -150,7 +150,7 @@ class PluginManager
                 return;
             }
 
-            if ($package->getName() === 'symfony/flex' && version_compare($package->getVersion(), '1.9.8', '<') && $package->getVersion() !== 'dev-main') {
+            if ($package->getName() === 'symfony/flex' && preg_match('{^[0-9.]+$}', $package->getVersion()) && version_compare($package->getVersion(), '1.9.8', '<')) {
                 $this->io->writeError('<warning>The "' . $package->getName() . '" plugin was skipped because it is not compatible with Composer 2+. Make sure to update it to version 1.9.8 or greater.</warning>');
 
                 return;