diff --git a/libs/grout/.eslintignore b/libs/grout/.eslintignore
index 9dde9fd960..5def58657b 100644
--- a/libs/grout/.eslintignore
+++ b/libs/grout/.eslintignore
@@ -1,5 +1,6 @@
 *.js
 *.d.ts
+vitest.config.ts
 build
 coverage
 test-utils
\ No newline at end of file
diff --git a/libs/grout/jest.config.js b/libs/grout/jest.config.js
deleted file mode 100644
index 0c9a77bd87..0000000000
--- a/libs/grout/jest.config.js
+++ /dev/null
@@ -1,8 +0,0 @@
-const shared = require('../../jest.config.shared');
-
-/**
- * @type {import('@jest/types').Config.InitialOptions}
- */
-module.exports = {
-  ...shared,
-};
diff --git a/libs/grout/package.json b/libs/grout/package.json
index dc4e91fa9c..aaee4e2d6d 100644
--- a/libs/grout/package.json
+++ b/libs/grout/package.json
@@ -15,9 +15,9 @@
     "lint:fix": "pnpm type-check && eslint . --fix",
     "pre-commit": "lint-staged",
     "test": "is-ci test:ci test:watch",
-    "test:ci": "jest --coverage --reporters=default --reporters=jest-junit --maxWorkers=6",
-    "test:coverage": "jest --coverage",
-    "test:watch": "jest --watch",
+    "test:ci": "vitest run --coverage",
+    "test:coverage": "vitest --coverage",
+    "test:watch": "vitest",
     "type-check": "tsc --build"
   },
   "dependencies": {
@@ -29,19 +29,16 @@
   "devDependencies": {
     "@types/debug": "4.1.8",
     "@types/express": "4.17.14",
-    "@types/jest": "^29.5.3",
     "@types/luxon": "^3.0.0",
     "@types/node-fetch": "^2.6.0",
+    "@vitest/coverage-istanbul": "^2.1.8",
     "eslint-plugin-vx": "workspace:*",
     "expect-type": "^0.15.0",
     "express": "4.18.2",
     "is-ci-cli": "2.2.0",
-    "jest": "^29.6.2",
-    "jest-junit": "^16.0.0",
-    "jest-watch-typeahead": "^2.2.2",
     "lint-staged": "11.0.0",
     "sort-package-json": "^1.50.0",
-    "ts-jest": "29.1.1"
+    "vitest": "^2.1.8"
   },
   "packageManager": "pnpm@8.15.5"
 }
diff --git a/libs/grout/src/grout.test.ts b/libs/grout/src/grout.test.ts
index f3131c3853..5a0be74fd8 100644
--- a/libs/grout/src/grout.test.ts
+++ b/libs/grout/src/grout.test.ts
@@ -1,5 +1,6 @@
 /* eslint-disable no-unused-expressions */
 /* eslint-disable @typescript-eslint/require-await */
+import { expect, test, vi } from 'vitest';
 import { AddressInfo } from 'node:net';
 import express from 'express';
 import { err, ok, Result } from '@votingworks/basics';
@@ -83,7 +84,7 @@ test('registers Express routes for an API', async () => {
 });
 
 test('sends a 500 for unexpected errors', async () => {
-  const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation();
+  const consoleErrorSpy = vi.spyOn(console, 'error').mockReturnValue();
   const api = createApi({
     async getStuff(): Promise<number> {
       throw new Error('Unexpected error');
diff --git a/libs/grout/src/serialization.test.ts b/libs/grout/src/serialization.test.ts
index 98238600eb..13ffa3eef7 100644
--- a/libs/grout/src/serialization.test.ts
+++ b/libs/grout/src/serialization.test.ts
@@ -1,4 +1,5 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
+import { expect, test } from 'vitest';
 import { Buffer } from 'node:buffer';
 import { DateWithoutTime, err, ok } from '@votingworks/basics';
 import { DateTime } from 'luxon';
diff --git a/libs/grout/vitest.config.ts b/libs/grout/vitest.config.ts
new file mode 100644
index 0000000000..1cc9c7884b
--- /dev/null
+++ b/libs/grout/vitest.config.ts
@@ -0,0 +1,3 @@
+import { defineConfig } from '../../vitest.config.shared.mjs';
+
+export default defineConfig();
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c687121365..837cae6771 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4216,15 +4216,15 @@ importers:
       '@types/express':
         specifier: 4.17.14
         version: 4.17.14
-      '@types/jest':
-        specifier: ^29.5.3
-        version: 29.5.3
       '@types/luxon':
         specifier: ^3.0.0
         version: 3.2.0
       '@types/node-fetch':
         specifier: ^2.6.0
         version: 2.6.2
+      '@vitest/coverage-istanbul':
+        specifier: ^2.1.8
+        version: 2.1.8(vitest@2.1.8)
       eslint-plugin-vx:
         specifier: workspace:*
         version: link:../eslint-plugin-vx
@@ -4237,24 +4237,15 @@ importers:
       is-ci-cli:
         specifier: 2.2.0
         version: 2.2.0
-      jest:
-        specifier: ^29.6.2
-        version: 29.6.2(@types/node@20.16.0)
-      jest-junit:
-        specifier: ^16.0.0
-        version: 16.0.0
-      jest-watch-typeahead:
-        specifier: ^2.2.2
-        version: 2.2.2(jest@29.6.2)
       lint-staged:
         specifier: 11.0.0
         version: 11.0.0
       sort-package-json:
         specifier: ^1.50.0
         version: 1.53.1
-      ts-jest:
-        specifier: 29.1.1
-        version: 29.1.1(@babel/core@7.26.0)(@jest/types@29.6.1)(esbuild@0.18.17)(jest@29.6.2)(typescript@5.6.2)
+      vitest:
+        specifier: ^2.1.8
+        version: 2.1.8
 
   libs/grout/test-utils:
     dependencies:
diff --git a/vitest.config.shared.mts b/vitest.config.shared.mts
index f4cc4a1be9..fdfebeba93 100644
--- a/vitest.config.shared.mts
+++ b/vitest.config.shared.mts
@@ -1,10 +1,10 @@
 import * as vitest from 'vitest/config';
-import { join } from 'node:path';
 
 const isCI = process.env['CI'] === 'true';
 
 export const base: vitest.ViteUserConfig = {
   test: {
+    include: ['src/**/*.test.{ts,tsx}', 'test/**/*.test.{ts,tsx}'],
     coverage: {
       thresholds: {
         lines: 100,