diff --git a/packages/devtools/vitest.config.ts b/packages/devtools/vitest.config.ts
index 2a6cbe55..576b8a45 100644
--- a/packages/devtools/vitest.config.ts
+++ b/packages/devtools/vitest.config.ts
@@ -6,6 +6,10 @@ export default defineConfig({
     // `--localstorage-file` and hides the jsdom one the tests rely on.
     execArgv: ['--no-experimental-webstorage'],
     setupFiles: ['src/__tests__/test-env.ts'],
+    // The Windows runner is several times slower at the tests that run a full
+    // devframe setup (the Analog source scan, the agent tools), and they hit the
+    // 5 s default there while taking under 100 ms on Linux.
+    testTimeout: process.platform === 'win32' ? 20_000 : 5_000,
     // Used only with `--coverage` (`pnpm test:coverage`): a report, with no threshold to meet.
     coverage: {
       provider: 'v8',