diff --git a/curriculum/package-lock.json b/curriculum/package-lock.json
index af9de82389..8f6938a298 100644
--- a/curriculum/package-lock.json
+++ b/curriculum/package-lock.json
@@ -7437,12 +7437,6 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
-    "validator": {
-      "version": "10.11.0",
-      "resolved": "https://registry.npmjs.org/validator/-/validator-10.11.0.tgz",
-      "integrity": "sha512-X/p3UZerAIsbBfN/IwahhYaBbY68EN/UQBWHtsbXGT5bfrH/p4NQzUCG1kF/rtKaNpnJ7jAu6NGTdSNtyNIXMw==",
-      "dev": true
-    },
     "value-or-function": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/value-or-function/-/value-or-function-3.0.0.tgz",
diff --git a/curriculum/package.json b/curriculum/package.json
index a6af835376..297ecd3d66 100644
--- a/curriculum/package.json
+++ b/curriculum/package.json
@@ -57,7 +57,6 @@
     "puppeteer": "^5.3.1",
     "readdirp-walk": "^1.7.0",
     "rx": "^4.1.0",
-    "string-similarity": "^4.0.2",
-    "validator": "^10.4.0"
+    "string-similarity": "^4.0.2"
   }
 }
diff --git a/curriculum/test/utils/mongoIds.js b/curriculum/test/utils/mongoIds.js
index 2ef3c3a2f9..ee5e42d469 100644
--- a/curriculum/test/utils/mongoIds.js
+++ b/curriculum/test/utils/mongoIds.js
@@ -1,15 +1,21 @@
-const _ = require('lodash');
-const { isMongoId } = require('validator');
+const findIndex = require('lodash/findIndex');
+const Joi = require('joi');
+Joi.objectId = require('joi-objectid')(Joi);
+
+const schema = Joi.objectId();
 
 class MongoIds {
   constructor() {
     this.knownIds = [];
   }
   check(id, title) {
-    if (!isMongoId(id)) {
+    try {
+      Joi.validate(id, schema);
+    } catch {
       throw new Error(`Expected a valid ObjectId for ${title}, but got ${id}`);
     }
-    const idIndex = _.findIndex(this.knownIds, existing => id === existing);
+
+    const idIndex = findIndex(this.knownIds, existing => id === existing);
     if (idIndex !== -1) {
       throw new Error(`
     All challenges must have a unique id.