diff --git a/composer.json b/composer.json
index 150481e14b..1004aa2042 100644
--- a/composer.json
+++ b/composer.json
@@ -13,11 +13,11 @@
         "behat/mink": "1.7.x-dev",
         "behat/mink-goutte-driver": "^1.2",
         "behat/mink-selenium2-driver": "1.3.x-dev",
-        "composer/composer": "dev-master",
+        "composer/composer": "^1.8 || dev-master",
         "drupal/coder": "^8.3.2",
         "jcalderonzumba/gastonjs": "^1.0.2",
         "jcalderonzumba/mink-phantomjs-driver": "^0.3.1",
-        "mikey179/vfsstream": "2.0.x-dev",
+        "mikey179/vfsstream": "^1.2 || 2.0.x-dev",
         "phpunit/phpunit": "^6.5 || ^7",
         "phpspec/prophecy": "^1.7",
         "symfony/css-selector": "^3.4.0",