diff --git a/composer.json b/composer.json
index f309062a..b941c90f 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "wp-cli/db-command": "^1.3 || ^2 || ^3",
         "wp-cli/entity-command": "^1.3 || ^2 || ^3",
         "wp-cli/extension-command": "^1.2 || ^2 || ^3",
-        "wp-cli/wp-cli-tests": "^5"
+        "wp-cli/wp-cli-tests": "dev-ci/parallel-integration#04a78ab9833119b5af984ea4d17a2153ae69547f as 5.1.99"
     },
     "config": {
         "process-timeout": 7200,
@@ -70,7 +70,10 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {
-        "behat": "run-behat-tests",
+        "behat": [
+            "@putenv WP_CLI_TEST_PARALLEL=4",
+            "run-behat-tests"
+        ],
         "behat-rerun": "rerun-behat-tests",
         "lint": "run-linter-tests",
         "lint-gherkin": "run-gherkin-lint-tests",