diff --git a/src/Composer/Plugin.php b/src/Composer/Plugin.php
index a59cf95..6009b07 100644
--- a/src/Composer/Plugin.php
+++ b/src/Composer/Plugin.php
@@ -177,6 +177,9 @@ public function postUpdate(Event $event)
             $composer->getEventDispatcher(),
             $composer->getAutoloadGenerator()
         );
+        if (method_exists($installer, 'setPlatformRequirementFilter')) {
+            $installer->setPlatformRequirementFilter(((array) $trace['object'])["\0*\0platformRequirementFilter"]);
+        }
 
         if (0 !== $installer->run()) {
             file_put_contents(Factory::getComposerFile(), $composerJsonContents);
diff --git a/tests/install.sh b/tests/install.sh
index 01da882..33caeb4 100755
--- a/tests/install.sh
+++ b/tests/install.sh
@@ -17,7 +17,8 @@ echo "Using directory: ${BUILD_DIR}"
 mkdir -p $BUILD_DIR
 
 # Init composer
-composer req --working-dir $BUILD_DIR php-http/discovery --no-update
+composer req --working-dir $BUILD_DIR php-http/discovery --no-update --no-plugins
+composer config --working-dir $BUILD_DIR --no-plugins allow-plugins.php-http/discovery false
 
 # Argument 3 installs additional composer packages
 composer req --working-dir $BUILD_DIR $3