diff --git a/package-lock.json b/package-lock.json
index 42783f13..0820d31e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4673,6 +4673,7 @@
     },
     "node_modules/abbrev": {
       "version": "1.1.1",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/acorn": {
@@ -4811,6 +4812,7 @@
     },
     "node_modules/ansi-styles": {
       "version": "3.2.1",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "color-convert": "^1.9.0"
@@ -4862,6 +4864,7 @@
     },
     "node_modules/archy": {
       "version": "1.0.0",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/are-we-there-yet": {
@@ -5677,6 +5680,7 @@
     },
     "node_modules/balanced-match": {
       "version": "1.0.2",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/bare-events": {
@@ -5964,6 +5968,7 @@
     },
     "node_modules/chalk": {
       "version": "2.4.2",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-styles": "^3.2.1",
@@ -6023,6 +6028,7 @@
     },
     "node_modules/chownr": {
       "version": "2.0.0",
+      "dev": true,
       "license": "ISC",
       "engines": {
         "node": ">=10"
@@ -6030,6 +6036,7 @@
     },
     "node_modules/ci-info": {
       "version": "3.9.0",
+      "dev": true,
       "funding": [
         {
           "type": "github",
@@ -6219,6 +6226,7 @@
     },
     "node_modules/color-convert": {
       "version": "1.9.3",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "color-name": "1.1.3"
@@ -6226,6 +6234,7 @@
     },
     "node_modules/color-name": {
       "version": "1.1.3",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/color-support": {
@@ -6278,6 +6287,7 @@
     },
     "node_modules/concat-map": {
       "version": "0.0.1",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/concat-stream": {
@@ -6686,6 +6696,14 @@
         }
       }
     },
+    "node_modules/deep-freeze-es6": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/deep-freeze-es6/-/deep-freeze-es6-3.0.2.tgz",
+      "integrity": "sha512-snvTmNKjkzR1ywDMWN+jJtjEwqTPF0Nq0g1/puSkkaxgL71gJ0rJpsPF+WOqMRaVLWogtwb73lHthfSaqP8nIQ==",
+      "engines": {
+        "node": ">=18.12.0"
+      }
+    },
     "node_modules/deep-is": {
       "version": "0.1.4",
       "dev": true,
@@ -7168,6 +7186,7 @@
     },
     "node_modules/escape-string-regexp": {
       "version": "1.0.5",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.8.0"
@@ -8272,6 +8291,7 @@
     },
     "node_modules/fs-minipass": {
       "version": "2.1.0",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "minipass": "^3.0.0"
@@ -8282,6 +8302,7 @@
     },
     "node_modules/fs-minipass/node_modules/minipass": {
       "version": "3.3.6",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "yallist": "^4.0.0"
@@ -8326,6 +8347,7 @@
     },
     "node_modules/fs.realpath": {
       "version": "1.0.0",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/fsevents": {
@@ -8342,6 +8364,7 @@
     },
     "node_modules/function-bind": {
       "version": "1.1.2",
+      "dev": true,
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/ljharb"
@@ -8500,6 +8523,7 @@
     },
     "node_modules/glob": {
       "version": "7.2.3",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "fs.realpath": "^1.0.0",
@@ -8923,6 +8947,7 @@
     },
     "node_modules/graceful-fs": {
       "version": "4.2.11",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/grapheme-splitter": {
@@ -9329,6 +9354,7 @@
     },
     "node_modules/has-flag": {
       "version": "3.0.0",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=4"
@@ -9446,6 +9472,7 @@
     },
     "node_modules/hasown": {
       "version": "2.0.2",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "function-bind": "^1.1.2"
@@ -9475,6 +9502,7 @@
     },
     "node_modules/hosted-git-info": {
       "version": "2.8.9",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/html-encoding-sniffer": {
@@ -9593,6 +9621,7 @@
     },
     "node_modules/imurmurhash": {
       "version": "0.1.4",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.8.19"
@@ -9608,6 +9637,7 @@
     },
     "node_modules/inflight": {
       "version": "1.0.6",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "once": "^1.3.0",
@@ -9616,10 +9646,12 @@
     },
     "node_modules/inherits": {
       "version": "2.0.4",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/ini": {
       "version": "1.3.8",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/inquirer": {
@@ -9850,6 +9882,7 @@
     },
     "node_modules/is-core-module": {
       "version": "2.13.1",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "hasown": "^2.0.0"
@@ -10228,6 +10261,7 @@
     },
     "node_modules/isexe": {
       "version": "2.0.0",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/isobject": {
@@ -12249,6 +12283,7 @@
     },
     "node_modules/json-parse-even-better-errors": {
       "version": "2.3.1",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/json-schema-traverse": {
@@ -12514,6 +12549,7 @@
     },
     "node_modules/lru-cache": {
       "version": "6.0.0",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "yallist": "^4.0.0"
@@ -12891,6 +12927,7 @@
     },
     "node_modules/minimatch": {
       "version": "3.1.2",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "brace-expansion": "^1.1.7"
@@ -12901,6 +12938,7 @@
     },
     "node_modules/minimatch/node_modules/brace-expansion": {
       "version": "1.1.11",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0",
@@ -12922,6 +12960,7 @@
     },
     "node_modules/minipass": {
       "version": "5.0.0",
+      "dev": true,
       "license": "ISC",
       "engines": {
         "node": ">=8"
@@ -12929,6 +12968,7 @@
     },
     "node_modules/minizlib": {
       "version": "2.1.2",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "minipass": "^3.0.0",
@@ -12940,6 +12980,7 @@
     },
     "node_modules/minizlib/node_modules/minipass": {
       "version": "3.3.6",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "yallist": "^4.0.0"
@@ -12970,6 +13011,7 @@
     },
     "node_modules/mkdirp": {
       "version": "1.0.4",
+      "dev": true,
       "license": "MIT",
       "bin": {
         "mkdirp": "bin/cmd.js"
@@ -12985,6 +13027,7 @@
     },
     "node_modules/ms": {
       "version": "2.1.2",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/mute-stdout": {
@@ -13093,6 +13136,7 @@
     },
     "node_modules/nopt": {
       "version": "5.0.0",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "abbrev": "1"
@@ -13106,6 +13150,7 @@
     },
     "node_modules/normalize-package-data": {
       "version": "2.5.0",
+      "dev": true,
       "license": "BSD-2-Clause",
       "dependencies": {
         "hosted-git-info": "^2.1.4",
@@ -13116,6 +13161,7 @@
     },
     "node_modules/normalize-package-data/node_modules/semver": {
       "version": "5.7.2",
+      "dev": true,
       "license": "ISC",
       "bin": {
         "semver": "bin/semver"
@@ -15748,6 +15794,7 @@
     },
     "node_modules/once": {
       "version": "1.4.0",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "wrappy": "1"
@@ -15876,6 +15923,7 @@
     },
     "node_modules/p-map": {
       "version": "2.1.0",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -15980,6 +16028,7 @@
     },
     "node_modules/path-is-absolute": {
       "version": "1.0.1",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -15995,6 +16044,7 @@
     },
     "node_modules/path-parse": {
       "version": "1.0.7",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/path-root": {
@@ -16747,6 +16797,7 @@
     },
     "node_modules/resolve": {
       "version": "1.22.8",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "is-core-module": "^2.13.0",
@@ -17141,6 +17192,7 @@
     },
     "node_modules/semver": {
       "version": "7.6.0",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "lru-cache": "^6.0.0"
@@ -17299,6 +17351,7 @@
     },
     "node_modules/signal-exit": {
       "version": "3.0.7",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/simple-concat": {
@@ -17751,6 +17804,7 @@
     },
     "node_modules/spdx-correct": {
       "version": "3.2.0",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "spdx-expression-parse": "^3.0.0",
@@ -17759,10 +17813,12 @@
     },
     "node_modules/spdx-exceptions": {
       "version": "2.5.0",
+      "dev": true,
       "license": "CC-BY-3.0"
     },
     "node_modules/spdx-expression-parse": {
       "version": "3.0.1",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "spdx-exceptions": "^2.1.0",
@@ -17771,6 +17827,7 @@
     },
     "node_modules/spdx-license-ids": {
       "version": "3.0.17",
+      "dev": true,
       "license": "CC0-1.0"
     },
     "node_modules/split-string": {
@@ -18055,6 +18112,7 @@
     },
     "node_modules/supports-color": {
       "version": "5.5.0",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "has-flag": "^3.0.0"
@@ -18065,6 +18123,7 @@
     },
     "node_modules/supports-preserve-symlinks-flag": {
       "version": "1.0.0",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">= 0.4"
@@ -18123,6 +18182,7 @@
     },
     "node_modules/tar": {
       "version": "6.2.1",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "chownr": "^2.0.0",
@@ -18223,6 +18283,7 @@
     },
     "node_modules/text-table": {
       "version": "0.2.0",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/textextensions": {
@@ -19010,6 +19071,7 @@
     },
     "node_modules/validate-npm-package-license": {
       "version": "3.0.4",
+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "spdx-correct": "^3.0.0",
@@ -19232,6 +19294,7 @@
     },
     "node_modules/which": {
       "version": "2.0.2",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "isexe": "^2.0.0"
@@ -19349,10 +19412,12 @@
     },
     "node_modules/wrappy": {
       "version": "1.0.2",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/write-file-atomic": {
       "version": "4.0.2",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "imurmurhash": "^0.1.4",
@@ -19420,6 +19485,7 @@
     },
     "node_modules/yallist": {
       "version": "4.0.0",
+      "dev": true,
       "license": "ISC"
     },
     "node_modules/yargs": {
@@ -19483,7 +19549,8 @@
       "version": "0.0.1",
       "license": "ISC",
       "dependencies": {
-        "@aws-sdk/client-s3": "3.556.0"
+        "@aws-sdk/client-s3": "3.556.0",
+        "deep-freeze-es6": "^3.0.2"
       },
       "devDependencies": {
         "@jspsych/config": "^2.0.0",
diff --git a/packages/data/package.json b/packages/data/package.json
index 2034ac91..756009e1 100644
--- a/packages/data/package.json
+++ b/packages/data/package.json
@@ -21,7 +21,8 @@
     "test": "jest --coverage"
   },
   "dependencies": {
-    "@aws-sdk/client-s3": "3.556.0"
+    "@aws-sdk/client-s3": "3.556.0",
+    "deep-freeze-es6": "^3.0.2"
   },
   "devDependencies": {
     "@jspsych/config": "^2.0.0",
diff --git a/packages/data/src/index.ts b/packages/data/src/index.ts
index 4e612ce7..723f81ef 100644
--- a/packages/data/src/index.ts
+++ b/packages/data/src/index.ts
@@ -1,3 +1,4 @@
+import deepFreeze from "deep-freeze-es6";
 import {
   finish,
   retrieveChild,
@@ -34,7 +35,6 @@ async function load(response_uuid: string) {
     deepFreeze(window.chs);
     await finish();
   }
-  
 }
 
 export default { load, retrieveResponse, updateResponse, finish, s3 };
diff --git a/packages/data/src/utils.spec.ts b/packages/data/src/utils.spec.ts
index 3474ca20..56240702 100644
--- a/packages/data/src/utils.spec.ts
+++ b/packages/data/src/utils.spec.ts
@@ -9,10 +9,9 @@ function setLocationHref(href: string) {
    * Helper function for this set of tests.  This will update the current URL to the value
    * provided in argument href.
    */
-  // delete global.window.location;
-  // global.window = Object.create(window);
-  // global.window.location = { href };
-  return href;
+  delete global.window.location;
+  global.window = Object.create(window);
+  global.window.location = { href };
 }
 
 test("Api get function", async () => {
diff --git a/packages/surveys/src/utils.ts b/packages/surveys/src/utils.ts
index 8b52ce6a..615db7ad 100644
--- a/packages/surveys/src/utils.ts
+++ b/packages/surveys/src/utils.ts
@@ -1,17 +1,8 @@
 import Data from "@lookit/data";
-import { Study } from "@lookit/lookit-api/dist/types";
 import DOMPurify from "dompurify";
 import { marked } from "marked";
 import { Model } from "survey-jquery";
 
-declare global {
-  interface Window {
-    lookit: {
-      study: Study;
-    };
-  }
-}
-
 const CONFIG = <const>{
   marked: { async: false },
   dompurify: { USE_PROFILES: { html: true } },