diff --git a/.env.example b/.env.example
index 59962d7..b172816 100644
--- a/.env.example
+++ b/.env.example
@@ -4,8 +4,8 @@
 NODE_ENV=development
 PORT=3000
 
-# c3nav Integration (optional - defaults to 38c3)
-C3NAV_BASE_URL=https://38c3.c3nav.de
+# c3nav Integration (optional - defaults to 39c3)
+C3NAV_BASE_URL=https://39c3.c3nav.de
 
 # WebSocket Sync Server (required for multi-user location sharing)
 # For local development: ws://localhost:3001
diff --git a/src/app/[slug]/page.tsx b/src/app/[slug]/page.tsx
index ba3ec22..2429191 100644
--- a/src/app/[slug]/page.tsx
+++ b/src/app/[slug]/page.tsx
@@ -268,7 +268,7 @@ export default function RoomPage() {
           waypoints={waypoints}
           currentUserId={currentParticipantId || undefined}
           currentLocation={currentLocation}
-          eventId="38c3"
+          eventId="39c3"
           isSharing={isSharing}
           onToggleSharing={handleToggleSharing}
           onParticipantClick={(p) => {
diff --git a/src/app/api/c3nav/[event]/route.ts b/src/app/api/c3nav/[event]/route.ts
index c8b7b7b..1fdee97 100644
--- a/src/app/api/c3nav/[event]/route.ts
+++ b/src/app/api/c3nav/[event]/route.ts
@@ -11,7 +11,7 @@ interface RouteParams {
 }
 
 // Valid c3nav events
-const VALID_EVENTS = ['38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
+const VALID_EVENTS = ['39c3', '38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
 
 // Allowed API endpoints (whitelist for security)
 const ALLOWED_ENDPOINTS = [
diff --git a/src/app/api/c3nav/tiles/[event]/[level]/[z]/[x]/[y]/route.ts b/src/app/api/c3nav/tiles/[event]/[level]/[z]/[x]/[y]/route.ts
index e36249f..548d0f6 100644
--- a/src/app/api/c3nav/tiles/[event]/[level]/[z]/[x]/[y]/route.ts
+++ b/src/app/api/c3nav/tiles/[event]/[level]/[z]/[x]/[y]/route.ts
@@ -15,7 +15,7 @@ interface RouteParams {
 }
 
 // Valid c3nav events
-const VALID_EVENTS = ['38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
+const VALID_EVENTS = ['39c3', '38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
 
 export async function GET(request: NextRequest, { params }: RouteParams) {
   const { event, level, z, x, y } = params;
diff --git a/src/app/api/routing/route.ts b/src/app/api/routing/route.ts
index 901a9b6..9c6a436 100644
--- a/src/app/api/routing/route.ts
+++ b/src/app/api/routing/route.ts
@@ -5,7 +5,7 @@ import type { RouteSegment, C3NavRouteRequest } from '@/types';
 const OSRM_API = 'https://router.project-osrm.org';
 
 // c3nav routing API
-const C3NAV_EVENTS = ['38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
+const C3NAV_EVENTS = ['39c3', '38c3', '37c3', 'eh22', 'eh2025', 'camp2023'];
 
 interface RouteRequest {
   origin: {
@@ -222,7 +222,7 @@ async function getIndoorRoute(
 export async function POST(request: NextRequest) {
   try {
     const body: RouteRequest = await request.json();
-    const { origin, destination, mode = 'walking', eventId = '38c3', options } = body;
+    const { origin, destination, mode = 'walking', eventId = '39c3', options } = body;
 
     if (!origin || !destination) {
       return NextResponse.json(
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 585b98b..d43dfa3 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -4,7 +4,7 @@ import './globals.css';
 export const metadata: Metadata = {
   title: 'rMaps - Find Your Friends',
   description: 'Collaborative real-time friend-finding navigation for events',
-  keywords: ['maps', 'navigation', 'friends', 'realtime', 'CCC', '38c3'],
+  keywords: ['maps', 'navigation', 'friends', 'realtime', 'CCC', '39c3'],
   authors: [{ name: 'Jeff Emmett' }],
   openGraph: {
     title: 'rMaps - Find Your Friends',
diff --git a/src/app/page.tsx b/src/app/page.tsx
index b867d29..6027200 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -161,7 +161,7 @@ export default function HomePage() {
                     type="text"
                     value={roomName}
                     onChange={(e) => setRoomName(e.target.value)}
-                    placeholder="e.g., 38c3-crew"
+                    placeholder="e.g., 39c3-crew"
                     className="input flex-1"
                     maxLength={20}
                   />
diff --git a/src/components/map/C3NavEmbed.tsx b/src/components/map/C3NavEmbed.tsx
index 437a1fa..23e9856 100644
--- a/src/components/map/C3NavEmbed.tsx
+++ b/src/components/map/C3NavEmbed.tsx
@@ -4,7 +4,7 @@ import { useState, useEffect, useRef } from 'react';
 import type { Participant } from '@/types';
 
 interface C3NavEmbedProps {
-  /** Event identifier (e.g., '38c3', 'eh2025') */
+  /** Event identifier (e.g., '39c3', 'eh2025') */
   eventId?: string;
   /** Initial location to show */
   initialLocation?: string;
@@ -22,6 +22,7 @@ interface C3NavEmbedProps {
 
 // c3nav event URLs
 const C3NAV_EVENTS: Record<string, string> = {
+  '39c3': 'https://39c3.c3nav.de',
   '38c3': 'https://38c3.c3nav.de',
   '37c3': 'https://37c3.c3nav.de',
   'eh2025': 'https://eh2025.c3nav.de',
@@ -30,7 +31,7 @@ const C3NAV_EVENTS: Record<string, string> = {
 };
 
 export default function C3NavEmbed({
-  eventId = '38c3',
+  eventId = '39c3',
   initialLocation,
   participants = [],
   currentUserId,
@@ -43,7 +44,7 @@ export default function C3NavEmbed({
   const [error, setError] = useState<string | null>(null);
 
   // Get the c3nav base URL for the event
-  const baseUrl = C3NAV_EVENTS[eventId] || C3NAV_EVENTS['38c3'];
+  const baseUrl = C3NAV_EVENTS[eventId] || C3NAV_EVENTS['39c3'];
 
   // Build the embed URL
   const embedUrl = new URL(baseUrl);
diff --git a/src/components/map/DualMapView.tsx b/src/components/map/DualMapView.tsx
index 8ca93c0..abbb326 100644
--- a/src/components/map/DualMapView.tsx
+++ b/src/components/map/DualMapView.tsx
@@ -57,7 +57,7 @@ export default function DualMapView({
   waypoints = [],
   currentUserId,
   currentLocation,
-  eventId = '38c3',
+  eventId = '39c3',
   initialMode = 'auto',
   onParticipantClick,
   onWaypointClick,
diff --git a/src/lib/c3nav.ts b/src/lib/c3nav.ts
index e5bf2a8..d2f8d10 100644
--- a/src/lib/c3nav.ts
+++ b/src/lib/c3nav.ts
@@ -9,8 +9,8 @@ import type {
   C3NavRouteResponse,
 } from '@/types';
 
-// Default to 38c3, can be overridden per-room
-const DEFAULT_C3NAV_BASE = 'https://38c3.c3nav.de';
+// Default to 39c3, can be overridden per-room
+const DEFAULT_C3NAV_BASE = 'https://39c3.c3nav.de';
 
 export class C3NavClient {
   private baseUrl: string;
diff --git a/src/stores/room.ts b/src/stores/room.ts
index 15aa62d..5480113 100644
--- a/src/stores/room.ts
+++ b/src/stores/room.ts
@@ -283,7 +283,7 @@ export const useRoomStore = create<RoomState>((set, get) => ({
           },
           destination: destLocation,
           mode: 'walking',
-          eventId: room?.settings.eventId || '38c3',
+          eventId: room?.settings.eventId || '39c3',
         }),
       });
 
diff --git a/src/types/index.ts b/src/types/index.ts
index 30ffbb8..caf452e 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -25,7 +25,7 @@ export interface RoomSettings {
   defaultPrecision: PrecisionLevel;
   allowGuestJoin: boolean;
   showC3NavIndoor: boolean;        // enable c3nav integration
-  eventId?: string;                // e.g., '38c3', 'eh2025'
+  eventId?: string;                // e.g., '39c3', 'eh2025'
 }
 
 // ============================================================================