diff --git a/composer.json b/composer.json
index 0d77d97..9ce77cd 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "wp-cli/wp-cli": "^2.1"
     },
     "require-dev": {
-        "wp-cli/wp-cli-tests": "^3.2"
+        "wp-cli/wp-cli-tests": "^4.0"
     },
     "config": {
         "platform": {