diff --git a/packages/modules/redis/src/redis-container.test.ts b/packages/modules/redis/src/redis-container.test.ts
index a622c24ef..f8f4fba82 100644
--- a/packages/modules/redis/src/redis-container.test.ts
+++ b/packages/modules/redis/src/redis-container.test.ts
@@ -119,4 +119,84 @@ describe("RedisContainer", { timeout: 240_000 }, () => {
     client.destroy();
     // }
   });
+
+  it("should start redis with custom command", async () => {
+    const container = new RedisContainer(IMAGE).withCommand(["redis-server", "--loglevel", "verbose"]);
+    await using startedContainer = await container.start();
+
+    // @ts-expect-error - accessing private property for testing
+    expect(container.createOpts.Cmd).toEqual(["redis-server", "--loglevel", "verbose"]);
+
+    const client = createClient({ url: startedContainer.getConnectionUrl() });
+    await client.connect();
+
+    await client.set("key", "val");
+    expect(await client.get("key")).toBe("val");
+
+    client.destroy();
+  });
+
+  it("should start redis-stack with custom env", async () => {
+    const container = new RedisContainer(REDISSTACK_IMAGE).withEnvironment({ REDIS_ARGS: "--loglevel verbose" });
+    await using startedContainer = await container.start();
+
+    // @ts-expect-error - accessing private property for testing
+    expect(container.createOpts.Env).toEqual(["REDIS_ARGS=--loglevel verbose"]);
+
+    const client = createClient({ url: startedContainer.getConnectionUrl() });
+    await client.connect();
+
+    await client.set("key", "val");
+    expect(await client.get("key")).toBe("val");
+
+    client.destroy();
+  });
+
+  it("should start redis with custom command and keeping default args", async () => {
+    const sourcePath = fs.mkdtempSync("redis-");
+
+    const container = new RedisContainer(IMAGE)
+      .withCommand(["redis-server", "--loglevel", "verbose"])
+      .withPersistence(sourcePath);
+    await using startedContainer = await container.start();
+
+    // @ts-expect-error - accessing private property for testing
+    expect(container.createOpts.Cmd).toEqual([
+      "redis-server",
+      "--loglevel",
+      "verbose",
+      "--save 1 1 ",
+      "--appendonly yes",
+    ]);
+
+    const client = createClient({ url: startedContainer.getConnectionUrl() });
+    await client.connect();
+
+    await client.set("key", "val");
+    expect(await client.get("key")).toBe("val");
+
+    client.destroy();
+    fs.rmSync(sourcePath, { force: true, recursive: true });
+  });
+
+  it("should start redis-stack with custom env and keeping default args", async () => {
+    const sourcePath = fs.mkdtempSync("redis-");
+
+    const container = new RedisContainer(REDISSTACK_IMAGE)
+      .withEnvironment({ REDIS_ARGS: "--loglevel verbose" })
+      .withPersistence(sourcePath);
+    await using startedContainer = await container.start();
+
+    // @ts-expect-error - accessing private property for testing
+    expect(container.createOpts.Env).toEqual(["REDIS_ARGS=--loglevel verbose --save 1 1  --appendonly yes"]);
+
+    const client = createClient({ url: startedContainer.getConnectionUrl() });
+    await client.connect();
+
+    await client.set("key", "val");
+    expect(await client.get("key")).toBe("val");
+
+    client.destroy();
+    fs.rmSync(sourcePath, { force: true, recursive: true });
+  });
 });
diff --git a/packages/modules/redis/src/redis-container.ts b/packages/modules/redis/src/redis-container.ts
index 2b5819843..94540dfb6 100644
--- a/packages/modules/redis/src/redis-container.ts
+++ b/packages/modules/redis/src/redis-container.ts
@@ -44,11 +44,21 @@ export class RedisContainer extends GenericContainer {
       ...(this.persistenceVolume ? ["--save 1 1 ", "--appendonly yes"] : []),
     ];
     if (this.imageName.image.includes("redis-stack")) {
+      const existingRedisArgs = this.environment["REDIS_ARGS"] ?? "";
+
+      // merge with filter to remove empty items
+      const mergedRedisArgs = [existingRedisArgs, ...redisArgs].filter(Boolean).join(" ");
+
+      // remove existing REDIS_ARGS to avoid duplicates
+      this.createOpts.Env = (this.createOpts.Env || []).filter((e) => !e.startsWith("REDIS_ARGS="));
+
       this.withEnvironment({
-        REDIS_ARGS: redisArgs.join(" "),
+        REDIS_ARGS: mergedRedisArgs,
       }).withEntrypoint(["/entrypoint.sh"]);
     } else {
-      this.withCommand(["redis-server", ...redisArgs]);
+      const existingCmd = this.createOpts.Cmd || [];
+      const baseCmd = existingCmd.length ? existingCmd : ["redis-server"];
+      this.withCommand([...baseCmd, ...redisArgs]);
     }
     if (this.persistenceVolume) {
       this.withBindMounts([{ mode: "rw", source: this.persistenceVolume, target: "/data" }]);