diff --git a/packages/web/package.json b/packages/web/package.json
index 0f06c0d58..56bb2d718 100644
--- a/packages/web/package.json
+++ b/packages/web/package.json
@@ -66,11 +66,14 @@
     "@hookform/resolvers": "^3.9.0",
     "@iconify/react": "^5.1.0",
     "@iizukak/codemirror-lang-wgsl": "^0.3.0",
+    "@langfuse/browser": "^5.9.1",
+    "@langfuse/otel": "^5.9.1",
     "@modelcontextprotocol/sdk": "^1.29.0",
     "@openrouter/ai-sdk-provider": "^2.2.3",
     "@opentelemetry/api-logs": "^0.203.0",
     "@opentelemetry/instrumentation": "^0.203.0",
     "@opentelemetry/sdk-logs": "^0.203.0",
+    "@opentelemetry/sdk-node": "^0.55.0",
     "@posthog/ai": "^7.18.7",
     "@radix-ui/react-accordion": "^1.2.11",
     "@radix-ui/react-alert-dialog": "^1.1.5",
@@ -156,8 +159,6 @@
     "graphql": "^16.9.0",
     "http-status-codes": "^2.3.0",
     "input-otp": "^1.4.2",
-    "langfuse": "^3.38.4",
-    "langfuse-vercel": "^3.38.4",
     "linguist-languages": "^9.3.1",
     "lucide-react": "^1.7.0",
     "mermaid": "^11.16.0",
diff --git a/packages/web/src/ee/features/chat/components/chatThread/answerCard.tsx b/packages/web/src/ee/features/chat/components/chatThread/answerCard.tsx
index 3ed22370e..735273fb4 100644
--- a/packages/web/src/ee/features/chat/components/chatThread/answerCard.tsx
+++ b/packages/web/src/ee/features/chat/components/chatThread/answerCard.tsx
@@ -15,10 +15,10 @@ import { convertLLMOutputToPortableMarkdown } from "@/features/chat/utils";
 import { submitFeedback } from "@/features/chat/actions";
 import { isServiceError } from "@/lib/utils";
 import useCaptureEvent from "@/hooks/useCaptureEvent";
-import { LangfuseWeb } from "langfuse";
 import { env } from "@sourcebot/shared/client";
 import isEqual from "fast-deep-equal/react";
 import { FileSource } from "@/features/chat/types";
+import { LangfuseBrowserClient } from "@langfuse/browser";
 
 interface AnswerCardProps {
     answerText: string;
@@ -28,7 +28,7 @@ interface AnswerCardProps {
     sources: FileSource[];
 }
 
-const langfuseWeb = env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY ? new LangfuseWeb({
+const langfuseBrowser = env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY ? new LangfuseBrowserClient({
     publicKey: env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY,
     baseUrl: env.NEXT_PUBLIC_LANGFUSE_BASE_URL,
 }) : null;
@@ -90,7 +90,7 @@ const AnswerCardComponent = forwardRef<HTMLDivElement, AnswerCardProps>(({
                 messageId,
             });
 
-            langfuseWeb?.score({
+            langfuseBrowser?.score({
                 traceId: traceId,
                 name: 'user_feedback',
                 value: feedbackType === 'like' ? 1 : 0,
diff --git a/packages/web/src/instrumentation.ts b/packages/web/src/instrumentation.ts
index 238495b4f..08b9b2f73 100644
--- a/packages/web/src/instrumentation.ts
+++ b/packages/web/src/instrumentation.ts
@@ -1,6 +1,7 @@
 import * as Sentry from '@sentry/nextjs';
 import { registerOTel } from '@vercel/otel';
-import { LangfuseExporter } from 'langfuse-vercel';
+import { LangfuseSpanProcessor } from '@langfuse/otel';
+import { NodeSDK } from '@opentelemetry/sdk-node';
 
 export async function register() {
     if (
@@ -8,14 +9,18 @@ export async function register() {
         process.env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY
     ) {
         console.log("Registering Langfuse");
-        registerOTel({
+        const sdk = new NodeSDK({
             serviceName: 'sourcebot',
-            traceExporter: new LangfuseExporter({
-                secretKey: process.env.LANGFUSE_SECRET_KEY,
-                publicKey: process.env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY,
-                baseUrl: process.env.NEXT_PUBLIC_LANGFUSE_BASE_URL,
-            }),
+            spanProcessors: [
+                new LangfuseSpanProcessor({
+                    secretKey: process.env.LANGFUSE_SECRET_KEY,
+                    publicKey: process.env.NEXT_PUBLIC_LANGFUSE_PUBLIC_KEY,
+                    baseUrl: process.env.NEXT_PUBLIC_LANGFUSE_BASE_URL,
+                }),
+            ],
         });
+        sdk.start();
+        registerOTel({ serviceName: 'sourcebot' });
     }
 
     if (process.env.NEXT_RUNTIME === 'nodejs') {
diff --git a/yarn.lock b/yarn.lock
index 54653dc8d..c8e7a1eb5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2426,7 +2426,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@grpc/grpc-js@npm:^1.12.6, @grpc/grpc-js@npm:^1.14.1":
+"@grpc/grpc-js@npm:^1.12.6, @grpc/grpc-js@npm:^1.14.1, @grpc/grpc-js@npm:^1.7.1":
   version: 1.14.4
   resolution: "@grpc/grpc-js@npm:1.14.4"
   dependencies:
@@ -3444,6 +3444,40 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@langfuse/browser@npm:^5.9.1":
+  version: 5.9.1
+  resolution: "@langfuse/browser@npm:5.9.1"
+  dependencies:
+    "@langfuse/core": "npm:^5.9.1"
+  peerDependencies:
+    "@opentelemetry/api": ^1.9.0
+  checksum: 10c0/7ad4495e168b3b32326ed83a0916e65d8afb182108b7618df34e3708fc5970578b9dce0a56bdae400b5d5bbe8e1a4ef51a1e104afb1100dea7f45f393d07cf6d
+  languageName: node
+  linkType: hard
+
+"@langfuse/core@npm:^5.9.1":
+  version: 5.9.1
+  resolution: "@langfuse/core@npm:5.9.1"
+  peerDependencies:
+    "@opentelemetry/api": ^1.9.0
+  checksum: 10c0/972639187c36e50cf3dad2e6ca9a59f9117093cebadc410f6d7c4c9d2344607fd3e7f409df09e5bea108c0b16b38ab8565c4c4185e70583c99b03af13bb73a4a
+  languageName: node
+  linkType: hard
+
+"@langfuse/otel@npm:^5.9.1":
+  version: 5.9.1
+  resolution: "@langfuse/otel@npm:5.9.1"
+  dependencies:
+    "@langfuse/core": "npm:^5.9.1"
+  peerDependencies:
+    "@opentelemetry/api": ^1.9.0
+    "@opentelemetry/core": ^2.0.1
+    "@opentelemetry/exporter-trace-otlp-http": ">=0.202.0 <1.0.0"
+    "@opentelemetry/sdk-trace-base": ^2.0.1
+  checksum: 10c0/4a08b5efc1de92a3cb040835495e0d8b5f52a4109ac4af5615ca2b9beb65ee1c88b95cdc0ba299351e91e9735e0f87f275b051f0670f6639e16d2ce4da5a12ae
+  languageName: node
+  linkType: hard
+
 "@lezer/common@npm:1.3.0":
   version: 1.3.0
   resolution: "@lezer/common@npm:1.3.0"
@@ -4675,6 +4709,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/api-logs@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/api-logs@npm:0.55.0"
+  dependencies:
+    "@opentelemetry/api": "npm:^1.3.0"
+  checksum: 10c0/9de1601939df121828ed8c48fa2cd923df9d471ef53ca7345a809ff1a940d3541efb64d2adada123b9a7f7feafb1d2acc59fa70e30dc3c3261a17b351c1309c3
+  languageName: node
+  linkType: hard
+
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   version: 1.9.0
   resolution: "@opentelemetry/api@npm:1.9.0"
@@ -4682,6 +4725,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/context-async-hooks@npm:1.28.0":
+  version: 1.28.0
+  resolution: "@opentelemetry/context-async-hooks@npm:1.28.0"
+  peerDependencies:
+    "@opentelemetry/api": ">=1.0.0 <1.10.0"
+  checksum: 10c0/bfd3b76dce4495d538307fef597c9145949f2b67b9096b1c06c63e14003cdee73fc06fa36bb512eb403f9e625caa4282024ca39367307524e501fcece93611dd
+  languageName: node
+  linkType: hard
+
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   version: 2.5.1
   resolution: "@opentelemetry/context-async-hooks@npm:2.5.1"
@@ -4702,6 +4754,36 @@ __metadata:
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   linkType: hard
 
+"@opentelemetry/exporter-logs-otlp-grpc@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/exporter-logs-otlp-grpc@npm:0.55.0"
+  dependencies:
+    "@grpc/grpc-js": "npm:^1.7.1"
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-grpc-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/sdk-logs": "npm:0.55.0"
+  peerDependencies:
+    "@opentelemetry/api": ^1.3.0
+  checksum: 10c0/9128ddf91a96fcec9bc916d027089eb09dff9061d7f8a85263182dcdfd139b412567871fe63ab9a84b6fb72eafd44d7fd05919b75f1d97baee4cb9505950f61f
+  languageName: node
+  linkType: hard
+
+"@opentelemetry/exporter-logs-otlp-http@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/exporter-logs-otlp-http@npm:0.55.0"
+  dependencies:
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+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/sdk-logs": "npm:0.55.0"
+  peerDependencies:
+    "@opentelemetry/api": ^1.3.0
+  checksum: 10c0/c451c59b4b502f8d0cb7a034fea16523b9a4f187e05dfc0eb5ea8be81679c3bb8084a2a2e530516db8cc8dbf1e08ae28a8c1fc5ab827a6b85f187b35c24b6c6d
+  languageName: node
+  linkType: hard
+
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   version: 0.208.0
   resolution: "@opentelemetry/exporter-logs-otlp-http@npm:0.208.0"
@@ -4717,6 +4799,83 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/exporter-logs-otlp-proto@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/exporter-logs-otlp-proto@npm:0.55.0"
+  dependencies:
+    "@opentelemetry/api-logs": "npm:0.55.0"
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-logs": "npm:0.55.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+  peerDependencies:
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+  checksum: 10c0/0f6ca147dbefba1b81a80d49b4f1bd7e9c46cac1201bb7e93265339756ae628118d8048ebc00521d8dd5a397eae052059e4181ee9f7a2867ea1780406ccf71d4
+  languageName: node
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+
+"@opentelemetry/exporter-trace-otlp-grpc@npm:0.55.0":
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+  resolution: "@opentelemetry/exporter-trace-otlp-grpc@npm:0.55.0"
+  dependencies:
+    "@grpc/grpc-js": "npm:^1.7.1"
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-grpc-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+  peerDependencies:
+    "@opentelemetry/api": ^1.3.0
+  checksum: 10c0/5b6f2821055179ba6b1d9a2fcf6e477890ec7cf9a778e6574ed2cec841df1e27bee5dee0059f91d25ea8200532c22accd063272f9f5f65d6613036480de1ab21
+  languageName: node
+  linkType: hard
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+"@opentelemetry/exporter-trace-otlp-http@npm:0.55.0":
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+  resolution: "@opentelemetry/exporter-trace-otlp-http@npm:0.55.0"
+  dependencies:
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+  peerDependencies:
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+  checksum: 10c0/3a64cdd70f5b3e0d21705114593b5e8528e6cda4fd8f68243dc02c059db823d2ce6e3c1d9d50a3028c9065a827caaf3aeb4e5eaecafd03875633e18c0a44b730
+  languageName: node
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+"@opentelemetry/exporter-trace-otlp-proto@npm:0.55.0":
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+  resolution: "@opentelemetry/exporter-trace-otlp-proto@npm:0.55.0"
+  dependencies:
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+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+  peerDependencies:
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+  checksum: 10c0/d66034bcab3782f056c35e5664fc915d55d776deb105e6eb8c9eab06036d19642608a43477818c5997cdcea245e65fcf9ee066827639a35a9a8d74e772cd9d6f
+  languageName: node
+  linkType: hard
+
+"@opentelemetry/exporter-zipkin@npm:1.28.0":
+  version: 1.28.0
+  resolution: "@opentelemetry/exporter-zipkin@npm:1.28.0"
+  dependencies:
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+    "@opentelemetry/semantic-conventions": "npm:1.27.0"
+  peerDependencies:
+    "@opentelemetry/api": ^1.0.0
+  checksum: 10c0/d4862dfa51a914e029c64a49694425358a907c5444eda8d7bece9e8071c0bba45fcc7f2b5a9fda31bc9bce0a4c6142e47939a859b99b53735148d3234f5396ae
+  languageName: node
+  linkType: hard
+
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   version: 0.58.0
   resolution: "@opentelemetry/instrumentation-amqplib@npm:0.58.0"
@@ -5009,6 +5168,22 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/instrumentation@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/instrumentation@npm:0.55.0"
+  dependencies:
+    "@opentelemetry/api-logs": "npm:0.55.0"
+    "@types/shimmer": "npm:^1.2.0"
+    import-in-the-middle: "npm:^1.8.1"
+    require-in-the-middle: "npm:^7.1.1"
+    semver: "npm:^7.5.2"
+    shimmer: "npm:^1.2.1"
+  peerDependencies:
+    "@opentelemetry/api": ^1.3.0
+  checksum: 10c0/c1175c63ecd3940a14176f5db89c48bcb64e9a7a366db70d3560913ccf624f6629fc91eb4ff3b6d5208e36df416bb14b5d87dbce5975c23e174c0191f54d06ab
+  languageName: node
+  linkType: hard
+
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   version: 0.203.0
   resolution: "@opentelemetry/instrumentation@npm:0.203.0"
@@ -5060,6 +5235,32 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/otlp-exporter-base@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/otlp-exporter-base@npm:0.55.0"
+  dependencies:
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+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+  peerDependencies:
+    "@opentelemetry/api": ^1.3.0
+  checksum: 10c0/716a845b7e3f58e37a76adb3838f54da409352e7dd9c44fa5727dc952985ce7e4b9ee96bc52f6a762d2f38c6ca60d36a85afd82cabf55dcd2cc86cb252b4170b
+  languageName: node
+  linkType: hard
+
+"@opentelemetry/otlp-grpc-exporter-base@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/otlp-grpc-exporter-base@npm:0.55.0"
+  dependencies:
+    "@grpc/grpc-js": "npm:^1.7.1"
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/otlp-exporter-base": "npm:0.55.0"
+    "@opentelemetry/otlp-transformer": "npm:0.55.0"
+  peerDependencies:
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+  checksum: 10c0/cfcde887effe3d757caf1585fb9e6ea18ff87ff6431513e89ff43dcaed2b6497d2ab4ac8c316a123242d5315b30956e8c64ea049e7076607ee687ffe20d55ac6
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+
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   resolution: "@opentelemetry/otlp-transformer@npm:0.208.0"
@@ -5077,6 +5278,45 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/otlp-transformer@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/otlp-transformer@npm:0.55.0"
+  dependencies:
+    "@opentelemetry/api-logs": "npm:0.55.0"
+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+    "@opentelemetry/sdk-logs": "npm:0.55.0"
+    "@opentelemetry/sdk-metrics": "npm:1.28.0"
+    "@opentelemetry/sdk-trace-base": "npm:1.28.0"
+    protobufjs: "npm:^7.3.0"
+  peerDependencies:
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+  checksum: 10c0/d0a21566f0b39f70475458d2532b3737b55585a91a699da04efab4869219d045e2e022d514ea0b26d0fdfe5c4fb432e8827a21f3128930c6a6936fc284908795
+  languageName: node
+  linkType: hard
+
+"@opentelemetry/propagator-b3@npm:1.28.0":
+  version: 1.28.0
+  resolution: "@opentelemetry/propagator-b3@npm:1.28.0"
+  dependencies:
+    "@opentelemetry/core": "npm:1.28.0"
+  peerDependencies:
+    "@opentelemetry/api": ">=1.0.0 <1.10.0"
+  checksum: 10c0/dd0ca51d2b216d8443790a4ba9c922985a627aad00505a15b32e9db48cb2a7934173e1c9bbd85682dc28873f4c4f46803f717850e348e54f1fe01f7de26be8e1
+  languageName: node
+  linkType: hard
+
+"@opentelemetry/propagator-jaeger@npm:1.28.0":
+  version: 1.28.0
+  resolution: "@opentelemetry/propagator-jaeger@npm:1.28.0"
+  dependencies:
+    "@opentelemetry/core": "npm:1.28.0"
+  peerDependencies:
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+  languageName: node
+  linkType: hard
+
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   resolution: "@opentelemetry/redis-common@npm:0.38.2"
@@ -5109,6 +5349,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/sdk-logs@npm:0.55.0":
+  version: 0.55.0
+  resolution: "@opentelemetry/sdk-logs@npm:0.55.0"
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+    "@opentelemetry/core": "npm:1.28.0"
+    "@opentelemetry/resources": "npm:1.28.0"
+  peerDependencies:
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+  languageName: node
+  linkType: hard
+
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   version: 0.203.0
   resolution: "@opentelemetry/sdk-logs@npm:0.203.0"
@@ -5122,6 +5375,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@opentelemetry/sdk-metrics@npm:1.28.0":
+  version: 1.28.0
+  resolution: "@opentelemetry/sdk-metrics@npm:1.28.0"
+  dependencies:
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   resolution: "@types/stack-trace@npm:0.0.33"
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