diff --git a/packages/bdt-customisations/composer.json b/packages/bdt-customisations/composer.json
index 30742956..1e2c5be3 100755
--- a/packages/bdt-customisations/composer.json
+++ b/packages/bdt-customisations/composer.json
@@ -3,7 +3,7 @@
   "description": "BDT WordPress customisations",
   "require-dev": {
     "phpunit/phpunit": "^9.6",
-    "yoast/phpunit-polyfills": "^1.0",
+    "yoast/phpunit-polyfills": "^1.0.5",
     "wp-graphql/wp-graphql": "^1.32.1",
     "dms/phpunit-arraysubset-asserts": "^0.5.0"
   }