diff --git a/support-lambdas/support-post-deployment-tests/packages/cdk/package.json b/support-lambdas/support-post-deployment-tests/packages/cdk/package.json
index 24ef1cf9042..96c94e76e09 100644
--- a/support-lambdas/support-post-deployment-tests/packages/cdk/package.json
+++ b/support-lambdas/support-post-deployment-tests/packages/cdk/package.json
@@ -19,6 +19,7 @@
     "@guardian/eslint-config-typescript": "1.0.11",
     "@guardian/prettier": "2.1.5",
     "@types/jest": "^29.5.5",
+    "@types/node": "20.5.9",
     "aws-cdk": "2.90.0",
     "aws-cdk-lib": "2.90.0",
     "constructs": "10.2.69",
diff --git a/support-lambdas/support-post-deployment-tests/yarn.lock b/support-lambdas/support-post-deployment-tests/yarn.lock
index 9f29c7e76ea..db1640ed48a 100644
--- a/support-lambdas/support-post-deployment-tests/yarn.lock
+++ b/support-lambdas/support-post-deployment-tests/yarn.lock
@@ -1019,6 +1019,11 @@
   resolved "https://registry.npmjs.org/@types/node/-/node-20.5.3.tgz"
   integrity sha512-ITI7rbWczR8a/S6qjAW7DMqxqFMjjTo61qZVWJ1ubPvbIQsL5D/TvwjYEalM8Kthpe3hTzOGrF2TGbAu2uyqeA==
 
+"@types/node@20.5.9":
+  version "20.5.9"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-20.5.9.tgz#a70ec9d8fa0180a314c3ede0e20ea56ff71aed9a"
+  integrity sha512-PcGNd//40kHAS3sTlzKB9C9XL4K0sTup8nbG5lC14kzEteTNuAFh9u5nA0o5TWnSG2r/JNPRXFVcHJIIeRlmqQ==
+
 "@types/normalize-package-data@^2.4.0":
   version "2.4.2"
   resolved "https://registry.npmjs.org/@types/normalize-package-data/-/normalize-package-data-2.4.2.tgz"