diff --git a/package.json b/package.json
index 0546c225664..120c05bd3e3 100644
--- a/package.json
+++ b/package.json
@@ -42,9 +42,9 @@
     "build:packages": "npm run build --workspaces",
     "build:sandbox": "node scripts/build_sandbox.js",
     "bundle": "npm run generate && node esbuild.config.js && node scripts/copy_bundle_assets.js",
-    "test": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test --workspaces --if-present --parallel",
-    "test:ci": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test:ci --workspaces --if-present --parallel && npm run test:scripts",
-    "test:release": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test:ci --workspaces --if-present --parallel -- --coverage.enabled=false && npm run test:scripts",
+    "test": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test --workspaces --if-present",
+    "test:ci": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test:ci --workspaces --if-present && npm run test:scripts",
+    "test:release": "cross-env NODE_OPTIONS=\"--max-old-space-size=3072\" npm run test:ci --workspaces --if-present -- --coverage.enabled=false && npm run test:scripts",
     "test:scripts": "vitest run --config ./scripts/tests/vitest.config.ts",
     "test:e2e": "cross-env VERBOSE=true KEEP_OUTPUT=true npm run test:integration:sandbox:none",
     "test:chrome-extension:e2e": "npm -w packages/chrome-extension run test:e2e:chrome",
diff --git a/scripts/tests/no-ak-integration-ci.test.js b/scripts/tests/no-ak-integration-ci.test.js
index 2efbbb9b9fd..98ac51c4b43 100644
--- a/scripts/tests/no-ak-integration-ci.test.js
+++ b/scripts/tests/no-ak-integration-ci.test.js
@@ -318,7 +318,7 @@ describe('no-AK integration CI wiring', () => {
     );
     expect(smokeWorkflow).toContain('npm run test:ci');
     expect(smokeWorkflow).not.toContain(
-      'npm run test:ci --workspaces --if-present --parallel',
+      'npm run test:ci --workspaces --if-present',
     );
     // Same ordering as the gate: autocrlf off before the checkout, the `./`
     // configure action after it.
diff --git a/scripts/tests/package-scripts.test.js b/scripts/tests/package-scripts.test.js
index d27bca3b0af..bebcb1869eb 100644
--- a/scripts/tests/package-scripts.test.js
+++ b/scripts/tests/package-scripts.test.js
@@ -75,7 +75,7 @@ describe('package scripts', () => {
     expect(packageJson.scripts['test:release']).toBe(
       [
         'cross-env NODE_OPTIONS="--max-old-space-size=3072"',
-        'npm run test:ci --workspaces --if-present --parallel -- --coverage.enabled=false',
+        'npm run test:ci --workspaces --if-present -- --coverage.enabled=false',
         '&& npm run test:scripts',
       ].join(' '),
     );