diff --git a/package-lock.json b/package-lock.json
index 8b84957..ec1dacd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -262,9 +262,9 @@
       "integrity": "sha512-S4XzBk5sMB+Rcb/LNcpzXr57VRTxgAvaAEDAl1AwRx27j00hT84O6OkteE7u8UB3NuaaygCRrEpqox4uDOrbdQ=="
     },
     "blakejs": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/blakejs/-/blakejs-1.1.0.tgz",
-      "integrity": "sha1-ad+S75U6qIylGjLfarHFShVfx6U="
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/blakejs/-/blakejs-1.1.2.tgz",
+      "integrity": "sha512-c482YFKvFRGlG2JshSIpKkek3WGn0qvhXAFcdZ0En9OgFFt2Ybu5urcnEHN3iQAz4wlLN6MBBVDDRkp8RfrjJg=="
     },
     "bn.js": {
       "version": "4.11.8",
@@ -537,9 +537,9 @@
       "dev": true
     },
     "fast-json-stable-stringify": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
-      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
+      "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="
     },
     "find-cache-dir": {
       "version": "2.1.0",
diff --git a/package.json b/package.json
index 659800f..197f451 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,13 @@
   "main": "dist/index.js",
   "module": "esm/index.js",
   "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.js",
+      "import": "./esm/index.js",
+      "types": "./dist/index.d.ts"      
+    }
+  },
   "files": [
     "dist",
     "esm"
@@ -74,9 +81,9 @@
   "dependencies": {
     "@vechain/ethers": "^4.0.27-5",
     "bignumber.js": "^7.2.1",
-    "blakejs": "^1.1.0",
+    "blakejs": "^1.1.2",
     "elliptic": "6.5.4",
-    "fast-json-stable-stringify": "^2.0.0",
+    "fast-json-stable-stringify": "^2.1.0",
     "js-sha3": "0.5.7",
     "rlp": "^2.0.0"
   },
diff --git a/src/blake2b.ts b/src/blake2b.ts
index ca22417..cbd835b 100644
--- a/src/blake2b.ts
+++ b/src/blake2b.ts
@@ -1,11 +1,11 @@
-const blake = require('blakejs')
+import  blake from 'blakejs'
 
 /**
  * computes blake2b 256bit hash of given data
  * @param data one or more Buffer | string
  */
 export function blake2b256(...data: Array<Buffer | string>) {
-    const ctx = blake.blake2bInit(32, null)
+    const ctx = blake.blake2bInit(32)
     data.forEach(d => {
         if (Buffer.isBuffer(d)) {
             blake.blake2bUpdate(ctx, d)
diff --git a/src/certificate.ts b/src/certificate.ts
index 80db3ee..0a98569 100644
--- a/src/certificate.ts
+++ b/src/certificate.ts
@@ -1,8 +1,7 @@
 import { address } from './address'
 import { blake2b256 } from './blake2b'
 import { secp256k1 } from './secp256k1'
-
-const fastJsonStableStringify = require('fast-json-stable-stringify')
+import fastJsonStableStringify from 'fast-json-stable-stringify'
 
 /**
  * Client side self-signed certificate
diff --git a/tsconfig.json b/tsconfig.json
index d22221d..5648901 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,6 +7,7 @@
     "inlineSourceMap": true,
     "moduleResolution": "node",
     "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
     "skipLibCheck": true
   },
   "include": [