diff --git a/CLAUDE.md b/CLAUDE.md
index 2a809184..94d633f1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -62,7 +62,7 @@ Community activity happens on a separate Discourse instance. Its display name is
 - og:url, og:image, and all absolute URLs must use https://offon.dev.
 - The og:image file is public/og.png and its full URL is https://offon.dev/og.png.
 - PR preview deployments are served from the gh-pages branch under /pr-preview/pr-{number}/.
-- The open source challenges content lives in a separate organisation at https://github.com/dynatrace-oss/open-ecosystem-challenges. This is an intentional external link and must never be changed or flagged as a violation.
+- The open source challenges content lives in a separate organisation at https://github.com/off-on-dev/open-source-challenges. This is an intentional external link and must never be changed or flagged as a violation.
 - The community Discourse instance is at https://community.offon.dev. Use the `COMMUNITY_URL` constant from `src/data/constants.ts`, never hardcode this URL.
 - `COMMUNITY_DISPLAY_NAME` is defined in `src/data/constants.ts` as the user-facing display name for the community URL. Use it for visible text, use `COMMUNITY_URL` for href attributes.
 
diff --git a/src/components/BottomCTA.tsx b/src/components/BottomCTA.tsx
index ed66f0e3..77ff3782 100644
--- a/src/components/BottomCTA.tsx
+++ b/src/components/BottomCTA.tsx
@@ -40,7 +40,7 @@ export const BottomCTA = (): JSX.Element => {
                 Join the Community <ExternalLink size={14} aria-hidden="true" /><span className="sr-only"> (opens in new tab)</span>
               </a>
               <a
-                href="https://github.com/dynatrace-oss/open-ecosystem-challenges"
+                href="https://github.com/off-on-dev/open-source-challenges"
                 target="_blank"
                 rel="noopener noreferrer"
               className="btn-ghost-inverse"
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index a00a622d..1050238b 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -35,7 +35,7 @@ export const Footer = (): JSX.Element => {
                 <Link to="/handbook" className={linkCls}>Handbook</Link>
                 <Link to="/about" className={linkCls}>About</Link>
                 <Link to="/sponsors" className={linkCls}>Sponsors</Link>
-                <a href="https://github.com/dynatrace-oss/open-ecosystem-challenges/blob/main/docs/contributing/adventure-ideas.md" target="_blank" rel="noopener noreferrer" className={linkCls}>Propose an Adventure Idea <ExternalLink size={12} aria-hidden="true" /><span className="sr-only"> (opens in new tab)</span></a>
+                <a href="https://github.com/off-on-dev/open-source-challenges/blob/main/docs/contributing/adventure-ideas.md" target="_blank" rel="noopener noreferrer" className={linkCls}>Propose an Adventure Idea <ExternalLink size={12} aria-hidden="true" /><span className="sr-only"> (opens in new tab)</span></a>
               </div>
             </nav>
             {/* Community */}
diff --git a/src/data/constants.ts b/src/data/constants.ts
index 25aebd14..6571e75b 100644
--- a/src/data/constants.ts
+++ b/src/data/constants.ts
@@ -7,7 +7,7 @@ export const BRAND_NAME = "OffOn";
 export const COMMUNITY_URL = "https://community.offon.dev";
 export const COMMUNITY_DISPLAY_NAME = "community.offon.dev";
 
-export const CODESPACES_BASE = "https://codespaces.new/dynatrace-oss/open-ecosystem-challenges";
+export const CODESPACES_BASE = "https://codespaces.new/off-on-dev/open-source-challenges";
 
 export const SITE_URL = "https://offon.dev";
 export const SITE_NAME = "offon.dev";
diff --git a/src/pages/CommunityGuide.tsx b/src/pages/CommunityGuide.tsx
index 8af356fc..711af89a 100644
--- a/src/pages/CommunityGuide.tsx
+++ b/src/pages/CommunityGuide.tsx
@@ -104,7 +104,7 @@ const CommunityGuide = (): JSX.Element => {
                 <p className="text-sm text-[hsl(var(--text-secondary))] leading-relaxed flex-1">
                   Bring your expertise and experience. Help build adventures for others to learn from open source tech with a broken scenario, a real-world failure, or a skill gap. Shape the next adventure.
                 </p>
-                <a href="https://github.com/dynatrace-oss/open-ecosystem-challenges/blob/main/docs/contributing/adventure-ideas.md" target="_blank" rel="noopener noreferrer" className={extLink}>
+                <a href="https://github.com/off-on-dev/open-source-challenges/blob/main/docs/contributing/adventure-ideas.md" target="_blank" rel="noopener noreferrer" className={extLink}>
                   Submit an idea <ExternalLink size={12} aria-hidden="true" /><span className="sr-only"> (opens in new tab)</span>
                 </a>
               </div>
diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 493b32be..ae141036 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -40,7 +40,7 @@ const Index = (): JSX.Element => {
               </p>
               <div className="flex gap-3 flex-wrap mt-2">
                 <a
-                  href="https://github.com/dynatrace-oss/open-ecosystem-challenges/blob/main/docs/contributing/adventure-ideas.md"
+                  href="https://github.com/off-on-dev/open-source-challenges/blob/main/docs/contributing/adventure-ideas.md"
                   target="_blank"
                   rel="noopener noreferrer"
                   className="btn-inverse"
diff --git a/src/root.tsx b/src/root.tsx
index a5d97bd2..4f20d8fd 100644
--- a/src/root.tsx
+++ b/src/root.tsx
@@ -32,9 +32,9 @@ const gtagBootstrap = `window.dataLayer=window.dataLayer||[];function gtag(){dat
 const webSiteJsonLd = `{"@context":"https://schema.org","@type":"WebSite","name":"OffOn","url":"https://offon.dev","description":"A vendor-neutral community for open source enthusiasts. Learn through hands-on challenges, share what you know, and connect with people who love open source."}`;
 
 // sameAs links populate Google's Knowledge Panel. Mirror LINKEDIN_URL,
-// the Discourse community URL, and the open-ecosystem-challenges GitHub org
+// the Discourse community URL, and the open-source-challenges GitHub org
 // from src/data/constants.ts.
-const orgJsonLd = `{"@context":"https://schema.org","@type":"Organization","name":"OffOn","url":"https://offon.dev","logo":"https://offon.dev/favicon.png","sameAs":["https://www.linkedin.com/company/open-ecosystem/","https://community.offon.dev","https://github.com/dynatrace-oss/open-ecosystem-challenges"]}`;
+const orgJsonLd = `{"@context":"https://schema.org","@type":"Organization","name":"OffOn","url":"https://offon.dev","logo":"https://offon.dev/favicon.png","sameAs":["https://www.linkedin.com/company/open-ecosystem/","https://community.offon.dev","https://github.com/off-on-dev/open-source-challenges"]}`;
 
 export default function Root(): JSX.Element {
   return (
diff --git a/src/test/adventures.test.ts b/src/test/adventures.test.ts
index 0a00d48e..6f3426f4 100644
--- a/src/test/adventures.test.ts
+++ b/src/test/adventures.test.ts
@@ -1,7 +1,7 @@
 import { describe, it, expect } from "vitest";
 import { ADVENTURES } from "@/data/adventures";
 
-const CODESPACES_BASE = "https://codespaces.new/dynatrace-oss/open-ecosystem-challenges";
+const CODESPACES_BASE = "https://codespaces.new/off-on-dev/open-source-challenges";
 
 const allLevels = ADVENTURES.flatMap((adventure) =>
   adventure.levels.map((level) => ({
diff --git a/src/test/communityGuide.test.tsx b/src/test/communityGuide.test.tsx
index d7551696..c9068338 100644
--- a/src/test/communityGuide.test.tsx
+++ b/src/test/communityGuide.test.tsx
@@ -102,7 +102,7 @@ describe("CommunityGuide - take on a challenge section", () => {
     renderCommunityGuide();
     const link = screen.getByRole("link", { name: /submit an idea/i });
     expect(link.getAttribute("href")).toBe(
-      "https://github.com/dynatrace-oss/open-ecosystem-challenges/blob/main/docs/contributing/adventure-ideas.md"
+      "https://github.com/off-on-dev/open-source-challenges/blob/main/docs/contributing/adventure-ideas.md"
     );
     expect(link.getAttribute("target")).toBe("_blank");
     expect(link.getAttribute("rel")).toBe("noopener noreferrer");
diff --git a/src/test/footer.test.tsx b/src/test/footer.test.tsx
index 8ee0e1a3..db632fa9 100644
--- a/src/test/footer.test.tsx
+++ b/src/test/footer.test.tsx
@@ -54,7 +54,7 @@ describe("Footer - Explore nav", () => {
     renderFooter();
     const nav = screen.getByRole("navigation", { name: "Explore" });
     const link = within(nav).getByRole("link", { name: /Propose an Adventure Idea/ });
-    expect(link.getAttribute("href")).toBe("https://github.com/dynatrace-oss/open-ecosystem-challenges/blob/main/docs/contributing/adventure-ideas.md");
+    expect(link.getAttribute("href")).toBe("https://github.com/off-on-dev/open-source-challenges/blob/main/docs/contributing/adventure-ideas.md");
     expect(link.getAttribute("target")).toBe("_blank");
     expect(link.getAttribute("rel")).toBe("noopener noreferrer");
   });