diff --git a/package.json b/package.json
index 07d0f51..8ef31bb 100644
--- a/package.json
+++ b/package.json
@@ -44,13 +44,15 @@
   },
   "type": "module",
   "dependencies": {
-    "@langchain/anthropic": "^0.3.25",
-    "@langchain/community": "^0.3.49",
-    "@langchain/google-genai": "^0.2.16",
-    "@langchain/mistralai": "^0.2.1",
-    "@langchain/ollama": "^0.2.3",
-    "@langchain/openai": "^0.6.3",
-    "langchain": "^0.3.30",
+    "@langchain/anthropic": "^1.0.0",
+    "@langchain/classic": "^1.0.0",
+    "@langchain/community": "^1.0.0",
+    "@langchain/core": "^1.0.1",
+    "@langchain/google-genai": "^1.0.0",
+    "@langchain/mistralai": "^1.0.0",
+    "@langchain/ollama": "^1.0.0",
+    "@langchain/openai": "^1.0.0",
+    "langchain": "^1.0.1",
     "uuid": "^13.0.0"
   },
   "peerDependencies": {
diff --git a/src/docFillerCore/engines/gptEngine.ts b/src/docFillerCore/engines/gptEngine.ts
index 6317931..e38d7ef 100644
--- a/src/docFillerCore/engines/gptEngine.ts
+++ b/src/docFillerCore/engines/gptEngine.ts
@@ -1,4 +1,5 @@
 import { ChatAnthropic } from '@langchain/anthropic';
+import { DatetimeOutputParser } from '@langchain/classic/output_parsers';
 import { ChromeAI } from '@langchain/community/experimental/llms/chrome_ai';
 import {
   StringOutputParser,
@@ -24,7 +25,6 @@ import {
   getSelectedProfileKey,
   loadProfiles,
 } from '@utils/storage/profiles/profileManager';
-import { DatetimeOutputParser } from 'langchain/output_parsers';
 import { z } from 'zod';
 import browser from 'webextension-polyfill';
 
diff --git a/tools/builder.ts b/tools/builder.ts
index 9da8bfe..b32b647 100644
--- a/tools/builder.ts
+++ b/tools/builder.ts
@@ -4,6 +4,28 @@ import copyContents from './copier';
 import entryPoints from './entrypoints';
 import { writeManifest } from './manifestWriter';
 
+// Plugin to stub Node.js built-in modules for browser builds
+const nodeBuiltinsPlugin: esbuild.Plugin = {
+  name: 'node-builtins',
+  setup(build) {
+    // Stub out node:* imports
+    build.onResolve({ filter: /^node:/ }, (args) => {
+      return {
+        path: args.path,
+        namespace: 'node-builtins-stub',
+      };
+    });
+
+    build.onLoad({ filter: /.*/, namespace: 'node-builtins-stub' }, () => {
+      return {
+        contents:
+          'export default {}; export const createRequire = () => () => {};',
+        loader: 'js',
+      };
+    });
+  },
+};
+
 const cleanBuildFolder = async () => {
   try {
     await fs.remove('./build');
@@ -25,6 +47,8 @@ const build = async (watch: boolean) => {
       bundle: true,
       // minify: true,
       outdir: './build/src',
+      platform: 'browser',
+      plugins: [nodeBuiltinsPlugin],
     });
     await buildContext.watch();
   } else {
@@ -33,6 +57,8 @@ const build = async (watch: boolean) => {
       bundle: true,
       // minify: true,
       outdir: './build/src',
+      platform: 'browser',
+      plugins: [nodeBuiltinsPlugin],
     });
 
     if (buildStatus.errors.length > 0) {