diff --git a/tests/imagegen/e2e/cli.test.ts b/tests/imagegen/e2e/cli.test.ts
index 41d14b26..017d03e6 100644
--- a/tests/imagegen/e2e/cli.test.ts
+++ b/tests/imagegen/e2e/cli.test.ts
@@ -8,8 +8,9 @@ import { join } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { PNG } from 'pngjs';
 
-// Each case renders a card in a subprocess, which exceeds the default 5s timeout.
-setDefaultTimeout(30000);
+// Each case renders a card in a subprocess, launching headless Chromium, which is
+// slow enough on a loaded two-core CI runner to blow past a 30s budget.
+setDefaultTimeout(120000);
 
 const CLI = fileURLToPath(new URL('../../../scripts/changelog/imagegen/cli.ts', import.meta.url));
 
diff --git a/tests/imagegen/integration/render.test.ts b/tests/imagegen/integration/render.test.ts
index 36b97c1b..c4c5d7bd 100644
--- a/tests/imagegen/integration/render.test.ts
+++ b/tests/imagegen/integration/render.test.ts
@@ -4,8 +4,9 @@ import { beforeAll, describe, setDefaultTimeout, test } from 'bun:test';
 import assert from 'node:assert/strict';
 import { PNG } from 'pngjs';
 
-// The render hook launches headless Chromium, which can exceed the default 5s on CI.
-setDefaultTimeout(30000);
+// The render hook launches headless Chromium, which is slow enough on a loaded
+// two-core CI runner to blow past a 30s budget.
+setDefaultTimeout(120000);
 
 import { renderCard } from '../../../scripts/changelog/imagegen/render';
 import { CARD_HEIGHT, CARD_WIDTH } from '../../../scripts/changelog/imagegen/template';
diff --git a/tests/imagegen/integration/run.test.ts b/tests/imagegen/integration/run.test.ts
index af8c9ba0..d4ca096b 100644
--- a/tests/imagegen/integration/run.test.ts
+++ b/tests/imagegen/integration/run.test.ts
@@ -4,8 +4,9 @@ import { afterAll, beforeAll, describe, setDefaultTimeout, test } from 'bun:test
 import assert from 'node:assert/strict';
 import { mkdtemp, readFile, rm } from 'node:fs/promises';
 
-// The pipeline renders with headless Chromium, which can exceed the default 5s on CI.
-setDefaultTimeout(30000);
+// The pipeline launches a fresh headless Chromium per render. On a loaded
+// two-core CI runner one launch has taken over 30s, so allow generous headroom.
+setDefaultTimeout(120000);
 
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';