diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 896d6fcd4..891806f36 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -58,7 +58,10 @@ jobs:
           cache: pnpm
 
       - run: pnpm install --frozen-lockfile
-      - run: pnpm run test
+      # Windows runners are slower and run the whole suite (including
+      # in-process e2e tests) under more contention, so the default 5s test
+      # timeout causes flaky failures. Give it more headroom.
+      - run: pnpm run test -- --testTimeout=30000
 
   lint:
     runs-on: ubuntu-latest