diff --git a/cli.js b/cli.js
index ab590e593e8..7190c499e95 100644
--- a/cli.js
+++ b/cli.js
@@ -11,6 +11,7 @@ import { Ajv as AjvDraft06And07 } from 'ajv'
 import _Ajv2019 from 'ajv/dist/2019.js'
 import _Ajv2020 from 'ajv/dist/2020.js'
 import _addFormats from 'ajv-formats'
+import _ajvKeywords from 'ajv-keywords'
 import { ajvFormatsDraft2019 } from '@hyperupcall/ajv-formats-draft2019'
 import schemasafe from '@exodus/schemasafe'
 import TOML from 'smol-toml'
@@ -55,6 +56,9 @@ const Ajv2019 = /** @type {any} */ (_Ajv2019)
 /** @type {typeof _Ajv2020.default} */
 const Ajv2020 = /** @type {any} */ (_Ajv2020)
 
+/** @type {any} */
+const ajvKeywords = _ajvKeywords
+
 /** @type {typeof _addFormats.default} */
 const addFormats = /** @type {any} */ (_addFormats)
 
@@ -487,6 +491,8 @@ async function ajvFactory(
       throw new Error('No JSON Schema version specified')
   }
 
+  ajvKeywords(ajv, 'uniqueItemProperties')
+
   /**
    * In strict mode, Ajv will throw an error if it does not
    * recognize any non-standard formats. That is, unrecognized
diff --git a/package-lock.json b/package-lock.json
index 85e065b6712..8b9be6a2602 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "ajv": "^8.18.0",
         "ajv-draft-04": "^1.0.0",
         "ajv-formats": "^2.1.1",
+        "ajv-keywords": "^5.1.0",
         "chalk": "^5.6.2",
         "eslint": "^9.26.0",
         "eslint-config-prettier": "^10.1.8",
@@ -463,6 +464,7 @@
       "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -486,6 +488,7 @@
       "integrity": "sha512-PlXPeEWMXMZ7sPYOHqmDyCJzcfNrUr3fGNKtezX14ykXOEIvyK81d+qydx89KY5O71FKMPaQ2vBfBFI5NHR63A==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.3",
         "fast-uri": "^3.0.1",
@@ -859,6 +862,7 @@
       "integrity": "sha512-XoMjdBOwe/esVgEvLmNsD3IRHkm7fbKIUGvrleloJXUZgDHig2IPWNniv+GwjyJXzuNqVjlr5+4yVUZjycJwfQ==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.8.0",
         "@eslint-community/regexpp": "^4.12.1",
@@ -1980,6 +1984,7 @@
       "integrity": "sha512-8c3mgTe0ASwWAJK+78dpviD+A8EqhndQPUBpNUIPt6+xWlIigCwfN01lWr9MAede4uqXGTEKeQWTvzb3vjia0Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -2405,6 +2410,7 @@
       "integrity": "sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==",
       "dev": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
diff --git a/package.json b/package.json
index 962893a460a..5ea93b2b807 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "ajv": "^8.18.0",
     "ajv-draft-04": "^1.0.0",
     "ajv-formats": "^2.1.1",
+    "ajv-keywords": "^5.1.0",
     "chalk": "^5.6.2",
     "eslint": "^9.26.0",
     "eslint-config-prettier": "^10.1.8",