diff --git a/composer.json b/composer.json
index 89cc9c2..3e2ba2d 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         "wp-cli/wp-cli": "^2.5"
     },
     "require-dev": {
-        "wp-cli/wp-cli-tests": "^3"
+        "wp-cli/wp-cli-tests": "^3.1"
     },
     "config": {
         "process-timeout": 7200,