diff --git a/packages/as-sha256/package.json b/packages/as-sha256/package.json
index 9b1bea04..aa2b2b4e 100644
--- a/packages/as-sha256/package.json
+++ b/packages/as-sha256/package.json
@@ -13,6 +13,7 @@
     "url": "git+https://github.com/chainsafe/ssz.git"
   },
   "main": "lib/index.js",
+  "deno": "src/index.ts",
   "typesVersions": {
     "*": {
       "*": [
diff --git a/packages/persistent-merkle-tree/package.json b/packages/persistent-merkle-tree/package.json
index eb7b9cd8..f30f4c72 100644
--- a/packages/persistent-merkle-tree/package.json
+++ b/packages/persistent-merkle-tree/package.json
@@ -3,6 +3,7 @@
   "version": "0.8.0",
   "description": "Merkle tree implemented as a persistent datastructure",
   "main": "lib/index.js",
+  "deno": "src/index.ts",
   "typesVersions": {
     "*": {
       "*": [
diff --git a/packages/persistent-merkle-tree/src/hasher/util.ts b/packages/persistent-merkle-tree/src/hasher/util.ts
index 365307eb..110e986c 100644
--- a/packages/persistent-merkle-tree/src/hasher/util.ts
+++ b/packages/persistent-merkle-tree/src/hasher/util.ts
@@ -1,4 +1,4 @@
-import {byteArrayToHashObject, HashObject, hashObjectToByteArray} from "@chainsafe/as-sha256/lib/hashObject";
+import {byteArrayToHashObject, HashObject, hashObjectToByteArray} from "@chainsafe/as-sha256";
 import {zeroHash} from "../zeroHash";
 
 export function hashObjectToUint8Array(obj: HashObject): Uint8Array {
diff --git a/packages/persistent-ts/package.json b/packages/persistent-ts/package.json
index 8e56deac..19ad3449 100644
--- a/packages/persistent-ts/package.json
+++ b/packages/persistent-ts/package.json
@@ -3,6 +3,7 @@
   "version": "0.19.1",
   "description": "Persistent data structures for TypeScript.",
   "main": "lib/index.js",
+  "deno": "src/index.ts",
   "files": [
     "lib/**/*.d.ts",
     "lib/**/*.js",
diff --git a/packages/ssz/package.json b/packages/ssz/package.json
index 84435f8e..1e36f62d 100644
--- a/packages/ssz/package.json
+++ b/packages/ssz/package.json
@@ -6,6 +6,7 @@
   "homepage": "https://github.com/chainsafe/ssz",
   "version": "0.18.0",
   "main": "lib/index.js",
+  "deno": "src/index.ts",
   "files": [
     "lib/**/*.d.ts",
     "lib/**/*.js",
diff --git a/packages/ssz/src/util/merkleize.ts b/packages/ssz/src/util/merkleize.ts
index 073dea5d..097a7788 100644
--- a/packages/ssz/src/util/merkleize.ts
+++ b/packages/ssz/src/util/merkleize.ts
@@ -1,5 +1,4 @@
-import {hasher} from "@chainsafe/persistent-merkle-tree/lib/hasher/index";
-import {zeroHash} from "@chainsafe/persistent-merkle-tree";
+import {zeroHash, digest64} from "@chainsafe/persistent-merkle-tree";
 
 /** Dedicated property to cache hashTreeRoot of immutable CompositeType values */
 export const symbolCachedPermanentRoot = Symbol("ssz_cached_permanent_root");
@@ -10,7 +9,7 @@ export type ValueWithCachedPermanentRoot = {
 };
 
 export function hash64(bytes32A: Uint8Array, bytes32B: Uint8Array): Uint8Array {
-  return hasher.digest64(bytes32A, bytes32B);
+  return digest64(bytes32A, bytes32B);
 }
 
 export function merkleize(chunks: Uint8Array[], padFor: number): Uint8Array {
diff --git a/vitest.base.unit.config.ts b/vitest.base.unit.config.ts
index fc0d7367..890683f6 100644
--- a/vitest.base.unit.config.ts
+++ b/vitest.base.unit.config.ts
@@ -26,6 +26,11 @@ function getTestEnvironment(
 }
 
 export default defineConfig({
+  resolve: {
+    // Adding `deno` field is just for testing purpose.
+    // Vite validates the package.json and could not find `lib/index.js` in deno runtime
+    mainFields: ["deno", "main"],
+  },
   test: {
     include: ["**/*.test.ts"],
     exclude: [