diff --git a/index.d.ts b/index.d.ts
index 1729b8d..814fee2 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,4 +1,4 @@
-/// <reference lib="es2020" />
+/// <reference lib="es2023" />
 /// <reference path="./globals.d.ts" />
 /// <reference path="./os.d.ts" />
 /// <reference path="./std.d.ts" />
diff --git a/os.d.ts b/os.d.ts
index b0a5e70..8f5c127 100644
--- a/os.d.ts
+++ b/os.d.ts
@@ -63,7 +63,7 @@ declare module "os" {
   }
 
   export const SIGINT: 2;
-  export const SIGABRT: 6;
+  export const SIGABRT: 22;
   export const SIGFPE: 8;
   export const SIGILL: 4;
   export const SIGSEGV: 11;
@@ -76,19 +76,28 @@ declare module "os" {
   export const O_RDONLY: 0;
   export const O_WRONLY: 1;
   export const O_RDWR: 2;
-  export const O_CREAT: 64;
-  export const O_EXCL: 128;
+  export const O_CREAT: 256;
+  export const O_EXCL: 1024;
   export const O_TRUNC: 512;
-  export const O_APPEND: 1024;
+  export const O_APPEND: 8;
+  export const O_TEXT: 16384;
+  export const O_BINARY: 32768;
 
-  export function open(filename: string, flag: number, mode?: unknown): File | -1;
+  export const S_IFMT: 61440;
+  export const S_IFIFO: 4096;
+  export const S_IFCHR: 8192;
+  export const S_IFDIR: 16384;
+  export const S_IFBLK: 24576;
+  export const S_IFREG: 32768;
+
+  export function open(
+    filename: string,
+    flag: number,
+    mode?: unknown
+  ): File | -1;
   export function close(file: File): number;
   export function seek(file: File, offset: number, whence: Seek): number;
-  export function seek(
-    file: File,
-    offset: BigInt,
-    whence: Seek
-  ): BigInt;
+  export function seek(file: File, offset: BigInt, whence: Seek): BigInt;
   export function read(
     file: File,
     buffer: ArrayBuffer,
@@ -139,6 +148,8 @@ declare module "os" {
   export function dup2(oldFile: File, newFile: File): void;
   export function pipe(): [readFile: File, writeFile: File] | null;
   export function sleep(delay: number): void;
+  export function sleepAsync(delay: number): Promise<void>;
   export function setTimeout(cb: Callback, delay: number): TimeoutHandle;
   export function clearTimeout(handle: TimeoutHandle): void;
+  export function now(): number;
 }
diff --git a/std.d.ts b/std.d.ts
index 37b70ce..d4ee18a 100644
--- a/std.d.ts
+++ b/std.d.ts
@@ -1,10 +1,6 @@
 declare module "std" {
   import { File } from "os";
 
-  export interface EvalOptions {
-    backtrace_barrier?: boolean;
-  }
-
   export interface ErrorOptions {
     errorno: Error;
   }
@@ -50,7 +46,14 @@ declare module "std" {
   }
 
   export function exit(n: number): void;
-  export function evalScript(script: string, options?: EvalOptions): void;
+  export function evalScript(
+    script: string,
+    options?: { backtrace_barrier?: boolean; async?: false }
+  ): any;
+  export function evalScript(
+    script: string,
+    options?: { backtrace_barrier?: boolean; async?: true }
+  ): Promise<{ value: any }>;
   export function loadScript(filename: string): void;
   export function loadFile(filename: string): void;
   export function open(
@@ -75,7 +78,7 @@ declare module "std" {
 
   export function strerror(errorno: Error): string;
   export function gc(): void;
-  export function getenv(name: string): any | undefined;
+  export function getenv(name: string): string | undefined;
   export function setenv(name: string, value: any): void;
   export function unsetenv(name: string): void;
   export function getenviron(): { readonly [key: string]: string };
diff --git a/tsconfig.json b/tsconfig.json
index df302a6..5f194ac 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
-    "module": "ES2020",
-    "lib": ["ES2020"],
+    "target": "es2023",
+    "module": "esnext",
+    "lib": ["ES2023"],
     "noEmit": true,
     "strict": true,
     "noImplicitAny": true,