diff --git a/.npmrc b/.npmrc
index 4fd15ed..43c97e7 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1,2 +1 @@
 package-lock=false
-legacy-peer-deps=true
diff --git a/lib/children-tree.ts b/lib/children-tree.ts
index 0d0c899..274316d 100644
--- a/lib/children-tree.ts
+++ b/lib/children-tree.ts
@@ -36,6 +36,10 @@ export const build = (contract: Contract): object => {
 	for (const type of contract.metadata.children.types) {
 		if (contract.metadata.children.byType[type].size === 1) {
 			const hash = setFirst<string>(contract.metadata.children.byType[type]);
+			if (hash === undefined) {
+				throw new Error('Error retrieving child');
+			}
+
 			const child = contract.getChildByHash(hash);
 			if (child === undefined) {
 				throw new Error('Error retrieving child');
diff --git a/lib/partials.ts b/lib/partials.ts
index c3a8279..f8c3390 100644
--- a/lib/partials.ts
+++ b/lib/partials.ts
@@ -8,7 +8,7 @@ import Debug from 'debug';
 import * as fs from 'fs';
 import path from 'path';
 import handlebars from 'handlebars';
-import asyncHelpers from 'handlebars-async-helpers';
+import promisedHandlebars from 'promised-handlebars';
 import first from 'lodash/first';
 import invokeMap from 'lodash/invokeMap';
 import join from 'lodash/join';
@@ -30,7 +30,7 @@ import Contract from './contract';
 import type { ContractObject } from './types/types';
 import { cartesianProductWith, stripExtraBlankLines } from './utils';
 
-const hb = asyncHelpers(handlebars);
+const hb = promisedHandlebars(handlebars);
 
 const debug = Debug('partials');
 
@@ -39,7 +39,7 @@ const debug = Debug('partials');
  * @type {String}
  * @private
  */
-const REFERENCE_DELIMITER: string = '+';
+const REFERENCE_DELIMITER = '+';
 
 /**
  * @summary Calculate the paths to search for a partial given a contract
@@ -112,15 +112,23 @@ export const findPartial = (
 					range(options.structure.length, 1, -1),
 					(accumulator, slice) =>
 						accumulator.concat(invokeMap(products, 'slice', 0, slice)),
-					[] as string[][],
+					[] as string[],
 				);
 
-				const fallbackPaths = combinations.reduce(
+				const fallbackPaths = combinations.reduce<
+					Array<Array<string | undefined>>
+				>(
 					(accumulator, _, index, collection) =>
-						map([map(collection, first), map(collection, last)], (list) =>
-							take(list, index + 1),
+						map(
+							[
+								// For some reason typescript does not infer correctly the return
+								// type of first
+								map<string[], string | undefined>(collection, first),
+								map(collection, last),
+							],
+							(list) => take(list, index + 1),
 						).concat(accumulator),
-					[] as Array<Array<string | undefined>>,
+					[],
 				);
 
 				return (products as Array<Array<string | undefined>>)
diff --git a/lib/types/cuetypes.ts b/lib/types/cuetypes.ts
index 76ea480..ad0af12 100644
--- a/lib/types/cuetypes.ts
+++ b/lib/types/cuetypes.ts
@@ -12,7 +12,7 @@ export interface components {
 			type?: 'meta.blueprint';
 			layout?: components['schemas']['BlueprintLayout'];
 			skeleton?: { [key: string]: any };
-		} & { [key: string]: any };
+		};
 		BlueprintLayout: { [key: string]: any };
 		Contract: {
 			type: string;
diff --git a/lib/utils.ts b/lib/utils.ts
index 1237f4a..8cfe3af 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -82,7 +82,8 @@ export const setUnion = <T>(set1: Set<T>, set2: Set<T>): Set<T> => {
  * console.log(element)
  * > 'foo'
  */
-export const setFirst = <T>(set1: Set<T>): T => set1.values().next().value;
+export const setFirst = <T>(set1: Set<T>): T | undefined =>
+	set1.values().next().value;
 
 /**
  * @summary Map a set using an iteratee function
diff --git a/package.json b/package.json
index 9b61b3b..e25f9c2 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "doc": "typedoc --options ./typedoc.json",
     "lint": "balena-lint -t tsconfig.dev.json --typescript lib tests scripts",
     "lint-fix": "balena-lint -t tsconfig.dev.json --typescript --fix lib tests scripts",
-    "test:node": "mocha -r ts-node/register/transpile-only --reporter spec tests/**/*.spec.ts",
+    "test:node": "mocha -r ts-node/register/transpile-only --reporter spec \"tests/**/*.spec.ts\"",
     "test": "npm run build && npm run lint && npm run test:node",
     "test:fast": "npm run build && npm run test:node",
     "prepack": "npm run build"
@@ -36,10 +36,10 @@
   "dependencies": {
     "debug": "^3.2.6",
     "handlebars": "^4.7.8",
-    "handlebars-async-helpers": "^1.0.4",
     "js-combinatorics": "^0.5.5",
     "lodash": "^4.17.19",
     "object-hash": "^1.3.1",
+    "promised-handlebars": "^2.0.1",
     "semver": "^5.7.1",
     "skhema": "^5.3.2"
   },
@@ -63,12 +63,12 @@
     "openapi-typescript": "^3.2.4",
     "rimraf": "^3.0.2",
     "ts-node": "^8.10.1",
-    "typedoc": "^0.23.28",
-    "typescript": "^4.9.5"
+    "typedoc": "^0.27.5",
+    "typescript": "^5.7.2"
   },
   "engines": {
-    "node": "^20.0.0",
-    "npm": "^10.0.0"
+    "node": ">=20.0.0",
+    "npm": ">=10.0.0"
   },
   "versionist": {
     "publishedAt": "2024-04-30T23:37:32.408Z"
diff --git a/scripts/build-types.ts b/scripts/build-types.ts
index 5b0fc8c..1ada3a6 100644
--- a/scripts/build-types.ts
+++ b/scripts/build-types.ts
@@ -32,4 +32,6 @@ const main = async () => {
 	console.log(`Built types to ${output}`);
 };
 
-main().catch((err) => console.error(err));
+main().catch((err) => {
+	console.error(err);
+});
diff --git a/typings/handlebars-async-helpers.d.ts b/typings/promised-handlebars.d.ts
similarity index 72%
rename from typings/handlebars-async-helpers.d.ts
rename to typings/promised-handlebars.d.ts
index b1d53c8..e2a100e 100644
--- a/typings/handlebars-async-helpers.d.ts
+++ b/typings/promised-handlebars.d.ts
@@ -1,4 +1,4 @@
-declare module 'handlebars-async-helpers' {
+declare module 'promised-handlebars' {
 	import type Handlebars from 'handlebars';
 
 	const fn: (hb: typeof Handlebars) => typeof Handlebars;