diff --git a/packages/client/lib/commands/SUNION.spec.ts b/packages/client/lib/commands/SUNION.spec.ts
index b0ddf782f9..d91baa9c66 100644
--- a/packages/client/lib/commands/SUNION.spec.ts
+++ b/packages/client/lib/commands/SUNION.spec.ts
@@ -1,28 +1,31 @@
-// import { strict as assert } from 'assert';
-// import testUtils, { GLOBAL } from '../test-utils';
-// import { transformArguments } from './SUNION';
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import SUNION from './SUNION';
 
-// describe('SUNION', () => {
-//     describe('transformArguments', () => {
-//         it('string', () => {
-//             assert.deepEqual(
-//                 transformArguments('key'),
-//                 ['SUNION', 'key']
-//             );
-//         });
+describe('SUNION', () => {
+  describe('transformArguments', () => {
+    it('string', () => {
+      assert.deepEqual(
+        SUNION.transformArguments('key'),
+        ['SUNION', 'key']
+      );
+    });
 
-//         it('array', () => {
-//             assert.deepEqual(
-//                 transformArguments(['1', '2']),
-//                 ['SUNION', '1', '2']
-//             );
-//         });
-//     });
+    it('array', () => {
+      assert.deepEqual(
+        SUNION.transformArguments(['1', '2']),
+        ['SUNION', '1', '2']
+      );
+    });
+  });
 
-//     testUtils.testWithClient('client.sUnion', async client => {
-//         assert.deepEqual(
-//             await client.sUnion('key'),
-//             []
-//         );
-//     }, GLOBAL.SERVERS.OPEN);
-// });
+  testUtils.testAll('sUnion', async client => {
+    assert.deepEqual(
+      await client.sUnion('key'),
+      []
+    );
+  }, {
+    client: GLOBAL.SERVERS.OPEN,
+    cluster: GLOBAL.CLUSTERS.OPEN
+  });
+});
diff --git a/packages/client/lib/commands/SUNION.ts b/packages/client/lib/commands/SUNION.ts
index f9e7172acb..42042217e2 100644
--- a/packages/client/lib/commands/SUNION.ts
+++ b/packages/client/lib/commands/SUNION.ts
@@ -1,14 +1,11 @@
-// import { RedisCommandArgument, RedisCommandArguments } from '.';
-// import { pushVariadicArguments } from './generic-transformers';
+import { ArrayReply, BlobStringReply, Command } from '../RESP/types';
+import { RedisVariadicArgument, pushVariadicArguments } from './generic-transformers';
 
-// export const FIRST_KEY_INDEX = 1;
-
-// export const IS_READ_ONLY = true;
-
-// export function transformArguments(
-//     keys: RedisCommandArgument | Array<RedisCommandArgument>
-// ): RedisCommandArguments {
-//     return pushVariadicArguments(['SUNION'], keys);
-// }
-
-// export declare function transformReply(): Array<RedisCommandArgument>;
+export default {
+  FIRST_KEY_INDEX: 1,
+  IS_READ_ONLY: true,
+  transformArguments(keys: RedisVariadicArgument) {
+    return pushVariadicArguments(['SUNION'], keys);
+  },
+  transformReply: undefined as unknown as () => ArrayReply<BlobStringReply>
+} as const satisfies Command;
diff --git a/packages/client/lib/commands/index.ts b/packages/client/lib/commands/index.ts
index 143d9ce3ab..3629b0357d 100644
--- a/packages/client/lib/commands/index.ts
+++ b/packages/client/lib/commands/index.ts
@@ -151,6 +151,7 @@ import SRANDMEMBER from './SRANDMEMBER';
 import SREM from './SREM';
 import SSCAN from './SSCAN';
 import STRLEN from './STRLEN';
+import SUNION from './SUNION';
 import TOUCH from './TOUCH';
 import TTL from './TTL';
 import TYPE from './TYPE';
@@ -504,6 +505,8 @@ export default {
   sScan: SSCAN,
   STRLEN,
   strLen: STRLEN,
+  SUNION,
+  sUnion: SUNION,
   TOUCH,
   touch: TOUCH,
   TTL,