diff --git a/apps/web/src/components/chat/MessagesTimeline.test.tsx b/apps/web/src/components/chat/MessagesTimeline.test.tsx
index f7aeb679a87b..bb5170390a1a 100644
--- a/apps/web/src/components/chat/MessagesTimeline.test.tsx
+++ b/apps/web/src/components/chat/MessagesTimeline.test.tsx
@@ -260,10 +260,11 @@ function stubDomGlobals() {
 }
 
 beforeEach(stubDomGlobals);
+// Cold transformation of the full chat dependency graph needs extra time on slower CI workers.
 beforeAll(async () => {
   Object.defineProperty(window, "matchMedia", { value: matchMedia, configurable: true });
   ({ MessagesTimeline, resolvePreviewAnnotationImage } = await import("./MessagesTimeline"));
-}, 30_000);
+}, 120_000);
 
 const ACTIVE_THREAD_ENVIRONMENT_ID = EnvironmentId.make("environment-local");
 const MESSAGE_CREATED_AT = "2026-03-17T19:12:28.000Z";