diff --git a/composer.json b/composer.json
index 915ae49113..d6f03a3c5f 100644
--- a/composer.json
+++ b/composer.json
@@ -28,10 +28,10 @@
         "phpunit/phpunit": "^5",
         "kjohnson/since-unreleased": "^1.0.0",
         "wp-cli/wp-cli-bundle": "^2.5",
-        "yoast/phpunit-polyfills": "^1.1",
         "wordpress/wordpress": "dev-trunk",
         "squizlabs/php_codesniffer": "^3.5",
-        "php-stubs/wp-cli-stubs": "^2.8"
+        "php-stubs/wp-cli-stubs": "^2.8",
+        "yoast/phpunit-polyfills": "^1.1.0"
     },
     "keywords": [
         "wordpress",
diff --git a/composer.lock b/composer.lock
index 629b979648..e8a2030294 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": "d4a7486f80ee13219069d7414f4bee9f",
+    "content-hash": "710d2ab2c1fe36ccdb02fe9d59fa4d93",
     "packages": [
         {
             "name": "composer/installers",