diff --git a/langchain/package.json b/langchain/package.json
index 92b3cdfc23ae..4fa0f5f67f78 100644
--- a/langchain/package.json
+++ b/langchain/package.json
@@ -1420,7 +1420,7 @@
   },
   "dependencies": {
     "@anthropic-ai/sdk": "^0.9.1",
-    "@langchain/core": "~0.0.5",
+    "@langchain/core": "~0.0.6",
     "binary-extensions": "^2.2.0",
     "expr-eval": "^2.0.2",
     "flat": "^5.0.2",
diff --git a/langchain/src/callbacks/tests/langchain_tracer.int.test.ts b/langchain/src/callbacks/tests/langchain_tracer.int.test.ts
index b27f01c88338..2f651f2d77f6 100644
--- a/langchain/src/callbacks/tests/langchain_tracer.int.test.ts
+++ b/langchain/src/callbacks/tests/langchain_tracer.int.test.ts
@@ -87,7 +87,7 @@ test("Test traced chain with tags", async () => {
 
 test("Test Traced Agent with concurrency", async () => {
   process.env.LANGCHAIN_TRACING_V2 = "true";
-  const model = new OpenAI({ temperature: 0 });
+  const model = new ChatOpenAI({ temperature: 0 });
   const tools = [
     new SerpAPI(process.env.SERPAPI_API_KEY, {
       location: "Austin,Texas,United States",
@@ -98,7 +98,7 @@ test("Test Traced Agent with concurrency", async () => {
   ];
 
   const executor = await initializeAgentExecutorWithOptions(tools, model, {
-    agentType: "zero-shot-react-description",
+    agentType: "openai-functions",
     verbose: true,
   });
 
@@ -130,7 +130,7 @@ test("Test Traced Agent with chat model", async () => {
   ];
 
   const executor = await initializeAgentExecutorWithOptions(tools, model, {
-    agentType: "chat-zero-shot-react-description",
+    agentType: "openai-functions",
     verbose: true,
     metadata: { c: "d" },
   });
diff --git a/langchain/src/util/tiktoken.ts b/langchain/src/util/tiktoken.ts
index a823b5b18637..5876107bcfab 100644
--- a/langchain/src/util/tiktoken.ts
+++ b/langchain/src/util/tiktoken.ts
@@ -1,44 +1 @@
-import {
-  Tiktoken,
-  TiktokenBPE,
-  TiktokenEncoding,
-  TiktokenModel,
-  getEncodingNameForModel,
-} from "js-tiktoken/lite";
-import { AsyncCaller } from "./async_caller.js";
-
-const cache: Record<string, Promise<TiktokenBPE>> = {};
-
-const caller = /* #__PURE__ */ new AsyncCaller({});
-
-export async function getEncoding(
-  encoding: TiktokenEncoding,
-  options?: {
-    signal?: AbortSignal;
-    extendedSpecialTokens?: Record<string, number>;
-  }
-) {
-  if (!(encoding in cache)) {
-    cache[encoding] = caller
-      .fetch(`https://tiktoken.pages.dev/js/${encoding}.json`, {
-        signal: options?.signal,
-      })
-      .then((res) => res.json())
-      .catch((e) => {
-        delete cache[encoding];
-        throw e;
-      });
-  }
-
-  return new Tiktoken(await cache[encoding], options?.extendedSpecialTokens);
-}
-
-export async function encodingForModel(
-  model: TiktokenModel,
-  options?: {
-    signal?: AbortSignal;
-    extendedSpecialTokens?: Record<string, number>;
-  }
-) {
-  return getEncoding(getEncodingNameForModel(model), options);
-}
+export * from "@langchain/core/utils/tiktoken";
diff --git a/yarn.lock b/yarn.lock
index e634a96ae3a0..4a4b0fe8b086 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7997,7 +7997,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@langchain/core@workspace:*, @langchain/core@workspace:langchain-core, @langchain/core@~0.0.5":
+"@langchain/core@workspace:*, @langchain/core@workspace:langchain-core, @langchain/core@~0.0.6":
   version: 0.0.0-use.local
   resolution: "@langchain/core@workspace:langchain-core"
   dependencies:
@@ -22607,7 +22607,7 @@ __metadata:
     "@gradientai/nodejs-sdk": ^1.2.0
     "@huggingface/inference": ^2.6.4
     "@jest/globals": ^29.5.0
-    "@langchain/core": ~0.0.5
+    "@langchain/core": ~0.0.6
     "@mozilla/readability": ^0.4.4
     "@notionhq/client": ^2.2.10
     "@opensearch-project/opensearch": ^2.2.0