diff --git a/command.ts b/command.ts
index ac2d04a5..9512576c 100644
--- a/command.ts
+++ b/command.ts
@@ -118,6 +118,12 @@ export interface SetOpts {
   ex?: number;
   px?: number;
   keepttl?: boolean;
+  /**
+   * Enables `GET` option.
+   *
+   * `GET` option was added in Redis v6.2.
+   */
+  get?: boolean;
 }
 
 export interface SetWithModeOpts extends SetOpts {
@@ -327,12 +333,12 @@ export interface RedisCommands {
   set(
     key: string,
     value: RedisValue,
-    opts?: SetOpts,
+    opts?: Omit<SetOpts, "get"> & { get?: false | null },
   ): Promise<SimpleString>;
   set(
     key: string,
     value: RedisValue,
-    opts?: SetWithModeOpts,
+    opts?: (Omit<SetOpts, "get"> & { get: true }) | SetWithModeOpts,
   ): Promise<SimpleString | BulkNil>;
   setbit(key: string, offset: number, value: RedisValue): Promise<Integer>;
   setex(key: string, seconds: number, value: RedisValue): Promise<SimpleString>;
diff --git a/deps/std/testing.ts b/deps/std/testing.ts
index c7a3a1f8..b7cea7aa 100644
--- a/deps/std/testing.ts
+++ b/deps/std/testing.ts
@@ -1 +1,3 @@
 export * from "jsr:@std/testing@^1.0.0/bdd";
+export type * from "jsr:@std/testing@^1.0.0/types";
+export { assertType } from "jsr:@std/testing@^1.0.0/types";
diff --git a/redis.ts b/redis.ts
index 0a79b401..dfc1f51d 100644
--- a/redis.ts
+++ b/redis.ts
@@ -1347,17 +1347,21 @@ class RedisImpl implements Redis {
   set(
     key: string,
     value: RedisValue,
-    opts?: SetOpts,
+    opts?: Omit<SetOpts, "get"> & { get?: false | null },
   ): Promise<SimpleString>;
   set(
     key: string,
     value: RedisValue,
-    opts?: SetWithModeOpts,
+    opts?: (Omit<SetOpts, "get"> & { get: true }) | SetWithModeOpts,
   ): Promise<SimpleString | BulkNil>;
   set(
     key: string,
     value: RedisValue,
-    opts?: SetOpts | SetWithModeOpts,
+    opts?:
+      | (Omit<SetOpts, "get"> & {
+        get?: true | false | null;
+      })
+      | SetWithModeOpts,
   ) {
     const args: RedisValue[] = [key, value];
     if (opts?.ex !== undefined) {
@@ -1368,11 +1372,17 @@ class RedisImpl implements Redis {
     if (opts?.keepttl) {
       args.push("KEEPTTL");
     }
+    let isAbleToReturnNil = false;
     if ((opts as SetWithModeOpts)?.mode) {
       args.push((opts as SetWithModeOpts).mode);
-      return this.execStatusOrNilReply("SET", ...args);
+      isAbleToReturnNil = true;
     }
-    return this.execStatusReply("SET", ...args);
+    if (opts?.get) {
+      args.push("GET");
+    }
+    return isAbleToReturnNil
+      ? this.execStatusOrNilReply("SET", ...args)
+      : this.execStatusReply("SET", ...args);
   }
 
   setbit(key: string, offset: number, value: RedisValue) {
diff --git a/tests/commands/string.ts b/tests/commands/string.ts
index b2e7b1c7..18840807 100644
--- a/tests/commands/string.ts
+++ b/tests/commands/string.ts
@@ -1,5 +1,13 @@
 import { assertEquals } from "../../deps/std/assert.ts";
-import { afterAll, beforeAll, beforeEach, it } from "../../deps/std/testing.ts";
+import type { IsExact, IsNullable } from "../../deps/std/testing.ts";
+import {
+  afterAll,
+  assertType,
+  beforeAll,
+  beforeEach,
+  describe,
+  it,
+} from "../../deps/std/testing.ts";
 import type { Connector, TestServer } from "../test_util.ts";
 import type { Redis } from "../../mod.ts";
 
@@ -165,18 +173,38 @@ export function stringTests(
     assertEquals(await client.get("key1"), "test");
   });
 
-  it("set", async () => {
-    const s = await client.set("key", "fuga你好こんにちは");
-    assertEquals(s, "OK");
-    const fuga = await client.get("key");
-    assertEquals(fuga, "fuga你好こんにちは");
-  });
+  describe("set", () => {
+    it("can set a key", async () => {
+      const s = await client.set("key", "fuga你好こんにちは");
+      assertEquals(s, "OK");
+      assertType<IsExact<typeof s, string>>(true);
+      const fuga = await client.get("key");
+      assertEquals(fuga, "fuga你好こんにちは");
+    });
 
-  it("set Number", async () => {
-    const s = await client.set("key", 123);
-    assertEquals(s, "OK");
-    const v = await client.get("key");
-    assertEquals(v, "123");
+    it("supports `Number`", async () => {
+      const s = await client.set("key", 123);
+      assertEquals(s, "OK");
+      const v = await client.get("key");
+      assertEquals(v, "123");
+    });
+
+    it("supports `GET` option", async () => {
+      const prev = "foobar";
+      await client.set("setWithGetOpt", prev);
+      const result = await client.set("setWithGetOpt", "baz", { get: true });
+      assertEquals(result, prev);
+      assertType<IsNullable<typeof result>>(true);
+    });
+
+    it("supports `NX` option", async () => {
+      const prev = "foo";
+      const v1 = await client.set("setWithNX", prev, { mode: "NX" });
+      assertEquals(v1, "OK");
+      const v2 = await client.set("setWithNX", "bar", { mode: "NX" });
+      assertEquals(v2, null);
+      assertType<IsNullable<typeof v2>>(true);
+    });
   });
 
   it("setbit", async () => {