diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8cc86bd63..af4860cc7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -344,7 +344,16 @@ jobs:
       - name: Run ${{ matrix.task }}
         env:
           NODE_OPTIONS: --max-old-space-size=4096
-        run: ${{ matrix.command }}
+        run: |
+          set -euo pipefail
+          for attempt in 1 2 3; do
+            if ${{ matrix.command }}; then
+              exit 0
+            fi
+            echo "Test run failed (attempt $attempt/3). Retrying (flaky vitest worker crash)…"
+            sleep 10
+          done
+          exit 1
 
   macos-app:
     if: github.event_name == 'pull_request'
diff --git a/vitest.config.ts b/vitest.config.ts
index 16c3b403a..536678cdd 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -6,8 +6,10 @@ import { defineConfig } from "vitest/config";
 const repoRoot = path.dirname(fileURLToPath(import.meta.url));
 const isCI = process.env.CI === "true" || process.env.GITHUB_ACTIONS === "true";
 const isWindows = process.platform === "win32";
+const isMacOS = process.platform === "darwin";
 const localWorkers = Math.max(4, Math.min(16, os.cpus().length));
-const ciWorkers = isWindows ? 2 : 3;
+// Cap CI workers: Windows/macOS get 2 (flaky worker crashes), Linux gets 3
+const ciWorkers = isWindows || isMacOS ? 2 : 3;
 
 export default defineConfig({
   resolve: {