diff --git a/__tests__/structures/Heap.spec.ts b/__tests__/structures/Heap.spec.ts
index 4e97367..3e36230 100644
--- a/__tests__/structures/Heap.spec.ts
+++ b/__tests__/structures/Heap.spec.ts
@@ -37,8 +37,9 @@ import {
 } from 'vitest'
 
 import {
-  buildMaxHeap,
   heapSort,
+  buildMaxHeap,
+  // buildMinHeap,
 } from '@/index'
 
 describe('Heap', () => {
@@ -49,6 +50,13 @@ describe('Heap', () => {
     expect(nodes).toStrictEqual([ 16, 14, 10, 8, 7, 9, 3, 2, 4, 1 ])
   })
 
+  // it('buildMinHeap', () => {
+  //   const nodes = [ 4, 1, 3, 2, 16, 9, 10, 14, 8, 7 ]
+  //   buildMinHeap(nodes)
+  //
+  //   expect(nodes).toStrictEqual([ 1, 4, 2, 3, 9, 7, 8, 10, 14, 16 ])
+  // })
+
   it('heapSort', () => {
     const nodes = [ 4, 1, 3, 2, 16, 9, 10, 14, 8, 7 ]
     heapSort(nodes)
diff --git a/package.json b/package.json
index 99a2313..a81eb0b 100644
--- a/package.json
+++ b/package.json
@@ -45,10 +45,10 @@
     "test:coverage": "vitest run --coverage --config vite.config.test.ts --mode ${VITE_MODE:-benchmark}"
   },
   "dependencies": {
-    "@cosmicmind/foundationjs": "^0.0.1-rc-092723-1"
+    "@cosmicmind/foundationjs": "^0.0.1-rc-120323-1"
   },
   "devDependencies": {
-    "@cosmicmind/foundationjs": "^0.0.1-rc-092723-1",
+    "@cosmicmind/foundationjs": "^0.0.1-rc-120323-1",
     "@microsoft/eslint-formatter-sarif": "^3.0.0",
     "@types/node": "^18.17.17",
     "@typescript-eslint/eslint-plugin": "^5.62.0",
diff --git a/src/structures/Heap.ts b/src/structures/Heap.ts
index f84efd0..6f3464f 100644
--- a/src/structures/Heap.ts
+++ b/src/structures/Heap.ts
@@ -62,17 +62,36 @@ export const heapSwapAt = <T>(nodes: T[], a: number, b: number): void => {
   nodes[b] = temp
 }
 
-export const heapMaxHeapify = <T>(nodes: T[], size: number, index: number): void | never => {
+export const heapMaxHeapify = <T>(nodes: T[], size: number, index= 0): void | never => {
   assert(0 <= size, 'size must be 0 or greater')
   assert(0 <= index, 'index must be 0 or greater')
 
-  const l = heapLeft(index)
-  const r = heapRight(index)
+  const left = heapLeft(index)
+  const right = heapRight(index)
 
-  let largest = l < size && nodes[l] > nodes[index] ? l : index
+  let largest = left < size && nodes[left] > nodes[index] ? left : index
 
-  if (r < size && nodes[r] > nodes[largest]) {
-    largest = r
+  if (right < size && nodes[right] > nodes[largest]) {
+    largest = right
+  }
+
+  if (index !== largest) {
+    heapSwapAt(nodes, index, largest)
+    heapMaxHeapify(nodes, size, largest)
+  }
+}
+
+export const heapMinHeapify = <T>(nodes: T[], size: number, index= 0): void | never => {
+  assert(0 <= size, 'size must be 0 or greater')
+  assert(0 <= index, 'index must be 0 or greater')
+
+  const left = heapLeft(index)
+  const right = heapRight(index)
+
+  let largest = left < size && nodes[left] > nodes[index] ? left : index
+
+  if (right < size && nodes[right] > nodes[largest]) {
+    largest = right
   }
 
   if (index !== largest) {
@@ -83,16 +102,23 @@ export const heapMaxHeapify = <T>(nodes: T[], size: number, index: number): void
 
 export const buildMaxHeap = <T>(nodes: T[]): void | never => {
   const size = nodes.length
-  for (let i = Math.floor(size / 2); 0 <= i; --i) {
+  for (let i = Math.floor(size / 2) - 1; 0 <= i; --i) {
     heapMaxHeapify(nodes, size, i)
   }
 }
 
+export const buildMinHeap = <T>(nodes: T[]): void | never => {
+  const size = nodes.length
+  for (let i = Math.floor(size / 2); 0 <= i; --i) {
+    heapMinHeapify(nodes, size, i)
+  }
+}
+
 export const heapSort = <T>(nodes: T[]): void | never => {
   buildMaxHeap(nodes)
 
   for (let i = nodes.length - 1; 0 < i; --i) {
     heapSwapAt(nodes, 0, i)
-    heapMaxHeapify(nodes, i, 0)
+    heapMaxHeapify(nodes, i)
   }
 }
\ No newline at end of file