diff --git a/package.json b/package.json
index 0698ea0..c8ad795 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "yargs": "^18.0.0"
   },
   "devDependencies": {
-    "ava": "^3.1.0",
+    "ava": "^8.0.0",
     "c8": "^12.0.0",
     "eslint": "^10.0.0",
     "eslint-config-problems": "10.0.1",
diff --git a/test/stdin.js b/test/stdin.js
index 5137694..7cc075e 100644
--- a/test/stdin.js
+++ b/test/stdin.js
@@ -7,22 +7,24 @@ import { exec } from 'node:child_process'
 import tmp from './helpers/tmp.js'
 import read from './helpers/read.js'
 
-test.cb('reads from stdin', (t) => {
+test('reads from stdin', (t) => {
   const output = tmp('output.css')
 
-  const cp = exec(
-    `node ${path.resolve('index.js')} -o ${output} --no-map`,
-    (error, stdout, stderr) => {
-      if (error) t.end(error, stderr)
+  return new Promise((resolve, reject) => {
+    const cp = exec(
+      `node ${path.resolve('index.js')} -o ${output} --no-map`,
+      (error) => {
+        if (error) return reject(error)
 
-      Promise.all([read(output), read('test/fixtures/a.css')])
-        .then(([a, e]) => {
-          t.is(a, e)
-          t.end()
-        })
-        .catch(t.end)
-    },
-  )
+        Promise.all([read(output), read('test/fixtures/a.css')])
+          .then(([a, e]) => {
+            t.is(a, e)
+            resolve()
+          })
+          .catch(reject)
+      },
+    )
 
-  createReadStream('test/fixtures/a.css').pipe(cp.stdin)
+    createReadStream('test/fixtures/a.css').pipe(cp.stdin)
+  })
 })
diff --git a/test/stdout.js b/test/stdout.js
index 6336cc7..0249c69 100644
--- a/test/stdout.js
+++ b/test/stdout.js
@@ -6,22 +6,27 @@ import { exec } from 'node:child_process'
 
 import read from './helpers/read.js'
 
-test.cb('writes to stdout', (t) => {
-  const cp = exec(
-    `node ${path.resolve(
-      'index.js',
-    )} --parser sugarss -u postcss-import --no-map`,
-    (error, stdout, stderr) => {
-      if (error) t.end(error, stderr)
+test('writes to stdout', (t) => {
+  return new Promise((resolve, reject) => {
+    const cp = exec(
+      `node ${path.resolve(
+        'index.js',
+      )} --parser sugarss -u postcss-import --no-map`,
+      (error, stdout) => {
+        if (error) return reject(error)
 
-      Promise.all([stdout.replace(/\r\n/g, '\n'), read('test/fixtures/s.css')])
-        .then(([a, e]) => {
-          t.is(a, e)
-          t.end()
-        })
-        .catch(t.end)
-    },
-  )
+        Promise.all([
+          stdout.replace(/\r\n/g, '\n'),
+          read('test/fixtures/s.css'),
+        ])
+          .then(([a, e]) => {
+            t.is(a, e)
+            resolve()
+          })
+          .catch(reject)
+      },
+    )
 
-  createReadStream('./test/fixtures/a.sss').pipe(cp.stdin)
+    createReadStream('./test/fixtures/a.sss').pipe(cp.stdin)
+  })
 })