diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index f26b244..e12b5b6 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -8,7 +8,7 @@
             "name": "@lumeweb/libportal",
             "version": "0.2.0-develop.25",
             "dependencies": {
-                "@lumeweb/libs5": "^0.1.0-develop.48",
+                "@lumeweb/libs5": "^0.1.0-develop.50",
                 "@noble/curves": "^1.1.0",
                 "@noble/hashes": "^1.3.1",
                 "detect-node": "^2.1.0",
@@ -1928,9 +1928,9 @@
             "peer": true
         },
         "node_modules/@lumeweb/libs5": {
-            "version": "0.1.0-develop.48",
-            "resolved": "https://registry.npmjs.org/@lumeweb/libs5/-/libs5-0.1.0-develop.48.tgz",
-            "integrity": "sha512-XO7btWOWMTrYD47uPtdVNLpni0PGOn4XDEsFO94WNO77WJ5E9wSDEFvpPjYjEi/51A2k4g3ku54TVPFCPDCHew==",
+            "version": "0.1.0-develop.50",
+            "resolved": "https://registry.npmjs.org/@lumeweb/libs5/-/libs5-0.1.0-develop.50.tgz",
+            "integrity": "sha512-mPywIV3n7YS5GdJHM0Ge9ODYeaHcdY6WJJMxlIr9OT2SudjCJJ426BynxGWSvJZR0O8u/SPyxNR6g+Uh1iC/1g==",
             "dependencies": {
                 "@noble/curves": "^1.1.0",
                 "@noble/hashes": "^1.3.1",
diff --git a/package.json b/package.json
index d4db105..4bcf0e7 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
         "semantic-release": "semantic-release"
     },
     "dependencies": {
-        "@lumeweb/libs5": "^0.1.0-develop.48",
+        "@lumeweb/libs5": "^0.1.0-develop.50",
         "@noble/curves": "^1.1.0",
         "@noble/hashes": "^1.3.1",
         "detect-node": "^2.1.0",
diff --git a/src/cid.ts b/src/cid.ts
deleted file mode 100644
index 082854f..0000000
--- a/src/cid.ts
+++ /dev/null
@@ -1,88 +0,0 @@
-import { base58btc } from "multiformats/bases/base58";
-import * as edUtils from "@noble/curves/abstract/utils";
-import { CID_HASH_TYPES, CID_TYPES } from "@lumeweb/libs5";
-
-export interface CID {
-  hash: Uint8Array;
-  size: bigint;
-  type: number;
-  hashType: number;
-}
-
-export function encodeCid(
-  hash: Uint8Array,
-  size: bigint,
-  type?: number,
-  hashType?: number,
-  raw?: boolean,
-);
-export function encodeCid(
-  hash: string,
-  size: bigint,
-  type?: number,
-  hashType?: number,
-  raw?: boolean,
-);
-export function encodeCid(
-  hash: any,
-  size: bigint,
-  type = CID_TYPES.RAW,
-  hashType = CID_HASH_TYPES.BLAKE3,
-  raw: boolean = false,
-) {
-  if (typeof hash === "string") {
-    hash = edUtils.hexToBytes(hash);
-  }
-
-  if (!(hash instanceof Uint8Array)) {
-    throw new Error();
-  }
-
-  if (size === undefined || size === null) {
-    throw new Error("size required");
-  }
-
-  size = BigInt(size);
-
-  const sizeBytes = new Uint8Array(8);
-  const sizeView = new DataView(sizeBytes.buffer);
-  sizeView.setBigInt64(0, size, true);
-
-  const prefixedHash = Uint8Array.from([type, hashType, ...hash, ...sizeBytes]);
-
-  if (raw) {
-    return prefixedHash;
-  }
-
-  return base58btc.encode(prefixedHash).toString();
-}
-
-export function decodeCid(cid: string | Uint8Array): CID {
-  let bytes = cid;
-
-  if (typeof bytes === "string") {
-    bytes = base58btc.decode(bytes);
-  }
-  if (!Object.values(CID_TYPES).includes(bytes[0])) {
-    throw new Error("Invalid cid type");
-  }
-
-  if (!Object.values(CID_HASH_TYPES).includes(bytes[1])) {
-    throw new Error("Invalid cid hash type");
-  }
-
-  const type = bytes[0];
-  const hashType = bytes[1];
-
-  bytes = bytes.slice(2);
-  let cidHash = bytes.slice(0, 32);
-  let size = bytes.slice(32);
-  const sizeView = new DataView(size.buffer);
-
-  return {
-    hash: cidHash,
-    size: sizeView.getBigInt64(0, true),
-    type,
-    hashType,
-  };
-}
diff --git a/src/client.ts b/src/client.ts
index b3dd2b3..c3bab9f 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -19,7 +19,6 @@ import streamToBlob from "stream-to-blob";
 
 import defer from "p-defer";
 import { blake3 } from "@noble/hashes/blake3";
-import { encodeCid } from "./cid.js";
 import {
   AuthStatusResponse,
   LoginResponse,
@@ -27,6 +26,7 @@ import {
 } from "./responses/auth.js";
 import isNode from "detect-node";
 import { utf8ToBytes } from "@noble/curves/abstract/utils";
+import { CID, CID_TYPES } from "@lumeweb/libs5";
 
 type NodeReadableStreamType = typeof import("stream").Readable;
 type NodePassThroughStreamType = typeof import("stream").PassThrough;
@@ -469,10 +469,10 @@ export class Client {
 
     await ret.promise;
 
-    const cid = encodeCid(hash, size as bigint);
+    const cid = CID.fromHash(hash, Number(size));
 
     while (true) {
-      const status = await this.getUploadStatus(cid as string);
+      const status = await this.getUploadStatus(cid.toString());
 
       if (status.status === "uploaded") {
         break;
@@ -483,7 +483,7 @@ export class Client {
       });
     }
 
-    return cid as string;
+    return cid.toString();
   }
 
   async getUploadStatus(cid: string) {
diff --git a/src/index.ts b/src/index.ts
index 77070e8..16b3d55 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,2 @@
 export * from "./client.js";
-export * from "./cid.js";
 export * from "./verify.js";