diff --git a/tracker/tracker-assist/.yarn/install-state.gz b/tracker/tracker-assist/.yarn/install-state.gz
index 8a0902616..f17e3ac34 100644
Binary files a/tracker/tracker-assist/.yarn/install-state.gz and b/tracker/tracker-assist/.yarn/install-state.gz differ
diff --git a/tracker/tracker-assist/package.json b/tracker/tracker-assist/package.json
index e110c7100..8745f6126 100644
--- a/tracker/tracker-assist/package.json
+++ b/tracker/tracker-assist/package.json
@@ -38,17 +38,16 @@
   },
   "devDependencies": {
     "@openreplay/tracker": "file:../tracker",
-    "@typescript-eslint/eslint-plugin": "^5.30.0",
-    "@typescript-eslint/parser": "^5.30.0",
-    "eslint": "^7.8.0",
-    "eslint-config-prettier": "^8.5.0",
-    "eslint-plugin-prettier": "^4.2.1",
-    "jest": "^29.3.1",
-    "jest-environment-jsdom": "^29.3.1",
-    "lint-staged": "^13.0.3",
-    "prettier": "^2.7.1",
+    "@typescript-eslint/eslint-plugin": "^8.14.0",
+    "@typescript-eslint/parser": "^8.14.0",
+    "eslint": "^9.15.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "prettier": "^3.3.3",
     "replace-in-files-cli": "^1.0.0",
-    "ts-jest": "^29.0.3",
+    "ts-jest": "^29.2.5",
     "typescript": "^5.6.3"
   },
   "lint-staged": {
diff --git a/tracker/tracker/.yarn/install-state.gz b/tracker/tracker/.yarn/install-state.gz
index 27000f6a5..fa46e2d7a 100644
Binary files a/tracker/tracker/.yarn/install-state.gz and b/tracker/tracker/.yarn/install-state.gz differ
diff --git a/tracker/tracker/package.json b/tracker/tracker/package.json
index d1ac4323c..a815ba4f7 100644
--- a/tracker/tracker/package.json
+++ b/tracker/tracker/package.json
@@ -43,26 +43,26 @@
     "prepublishOnly": "bun run test && bun run build"
   },
   "devDependencies": {
-    "@babel/core": "^7.10.2",
-    "@jest/globals": "^29.3.1",
+    "@babel/core": "^7.26.0",
+    "@jest/globals": "^29.7.0",
     "@rollup/plugin-babel": "^6.0.4",
-    "@rollup/plugin-node-resolve": "^15.2.3",
+    "@rollup/plugin-node-resolve": "^15.3.0",
     "@rollup/plugin-replace": "^6.0.1",
     "@rollup/plugin-terser": "0.4.4",
     "@rollup/plugin-typescript": "^12.1.1",
-    "@typescript-eslint/eslint-plugin": "^8.10.0",
-    "@typescript-eslint/parser": "^8.10.0",
-    "eslint": "^8.57.1",
-    "eslint-config-prettier": "^9.0.0",
-    "eslint-plugin-prettier": "^5.0.1",
-    "jest": "^29.3.1",
-    "jest-environment-jsdom": "^29.3.1",
-    "prettier": "^3.0.3",
+    "@typescript-eslint/eslint-plugin": "^8.14.0",
+    "@typescript-eslint/parser": "^8.14.0",
+    "eslint": "^9.15.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "prettier": "^3.3.3",
     "replace-in-files": "^2.0.3",
-    "rollup": "^4.1.4",
+    "rollup": "^4.27.2",
     "semver": "^6.3.0",
-    "ts-jest": "^29.0.3",
-    "tslib": "^2.8.0",
+    "ts-jest": "^29.2.5",
+    "tslib": "^2.8.1",
     "typescript": "^5.6.3"
   },
   "dependencies": {
diff --git a/tracker/tracker/src/tests/StringDictionary.unit.test.ts b/tracker/tracker/src/tests/StringDictionary.unit.test.ts
index dfe742d51..6f40e7efe 100644
--- a/tracker/tracker/src/tests/StringDictionary.unit.test.ts
+++ b/tracker/tracker/src/tests/StringDictionary.unit.test.ts
@@ -3,7 +3,7 @@ import { StringDictionary } from '../main/modules/attributeSender.js'
 
 describe('StringDictionary', () => {
   test('key is non-zero', () => {
-    const dict = new StringDictionary()
+    const dict = new StringDictionary(() => 1)
 
     const [key, isNew] = dict.getKey('We are Asayer')
 
@@ -12,7 +12,7 @@ describe('StringDictionary', () => {
   })
 
   test('Different strings have different keys', () => {
-    const dict = new StringDictionary()
+    const dict = new StringDictionary(() => 1)
 
     const [key1, isNew1] = dict.getKey('Datadog')
     const [key2, isNew2] = dict.getKey('PostHog')
@@ -22,7 +22,7 @@ describe('StringDictionary', () => {
   })
 
   test('Similar strings have similar keys', () => {
-    const dict = new StringDictionary()
+    const dict = new StringDictionary(() => 1)
 
     const [key1, isNew1] = dict.getKey("What's up?")
     const [key2, isNew2] = dict.getKey("What's up?")
diff --git a/tracker/tracker/src/tests/attributeSender.unit.test.ts b/tracker/tracker/src/tests/attributeSender.unit.test.ts
index 0fc8f50be..47cb4184e 100644
--- a/tracker/tracker/src/tests/attributeSender.unit.test.ts
+++ b/tracker/tracker/src/tests/attributeSender.unit.test.ts
@@ -9,6 +9,9 @@ describe('AttributeSender', () => {
   beforeEach(() => {
     appMock = {
       send: (...args: any[]) => args,
+      session: {
+        getPageNumber: () => 1,
+      }
     }
     attributeSender = new AttributeSender({
       app: appMock,
@@ -23,10 +26,10 @@ describe('AttributeSender', () => {
   test('should send the set attribute message to the app', () => {
     const sendSpy = jest.spyOn(appMock, 'send')
     const id = 1
-    const name = 'color'
-    const value = 'red'
+    const name = 'color' // 1_1
+    const value = 'red' // attribute is second, so 1_2; (page_key)
     // @ts-ignore
-    const expectedMessage = [Type.SetNodeAttributeDict, id, 1, 2]
+    const expectedMessage = [Type.SetNodeAttributeDict, id, '1_1', '1_2']
 
     attributeSender.sendSetAttribute(id, name, value)
 
@@ -54,14 +57,14 @@ describe('AttributeSender', () => {
 
   test('should send the string dictionary entry if the attribute is new', () => {
     const id = 1
-    const name = 'color'
+    const name = 'color' // 1_1, name comes first (page_keyid)
     const value = 'red'
     const sendSpy = jest.spyOn(appMock, 'send')
 
     attributeSender.sendSetAttribute(id, name, value)
 
     // @ts-ignore
-    expect(sendSpy).toHaveBeenCalledWith([Type.StringDict, expect.any(Number), name])
+    expect(sendSpy).toHaveBeenCalledWith([Type.StringDict, '1_1', name])
   })
 
   test('should not send the string dictionary entry if the attribute already exists', () => {
diff --git a/tracker/tracker/tsconfig-base.json b/tracker/tracker/tsconfig-base.json
index 8379b4f1d..1a48551d5 100644
--- a/tracker/tracker/tsconfig-base.json
+++ b/tracker/tracker/tsconfig-base.json
@@ -6,11 +6,12 @@
     "strictNullChecks": true,
     "alwaysStrict": true,
     "target": "es2020",
+    "lib": ["DOM", "ES2020"],
     "module": "NodeNext",
     "moduleResolution":  "NodeNext",
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
-    "resolveJsonModule": true,
+    "resolveJsonModule": true
   },
   "exclude": ["**/*.test.ts"],
 }