diff --git a/package-lock.json b/package-lock.json
index 5290ffc..9aa4f17 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,8 @@
       "dependencies": {
         "@solana/web3.js": "^1.10.1",
         "assert": "^2.0.0",
-        "buffer": "^6.0.1"
+        "buffer": "^6.0.1",
+        "jsbi": "^3.1.5"
       },
       "devDependencies": {
         "@types/jest": "^26.0.23",
@@ -4223,6 +4224,11 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsbi": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/jsbi/-/jsbi-3.1.5.tgz",
+      "integrity": "sha512-w2BY0VOYC1ahe+w6Qhl4SFoPvPsZ9NPHY4bwass+LCgU7RK3PBoVQlQ3G1s7vI8W3CYyJiEXcbKF7FIM/L8q3Q=="
+    },
     "node_modules/jsdom": {
       "version": "16.6.0",
       "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-16.6.0.tgz",
@@ -10458,6 +10464,11 @@
         "esprima": "^4.0.0"
       }
     },
+    "jsbi": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/jsbi/-/jsbi-3.1.5.tgz",
+      "integrity": "sha512-w2BY0VOYC1ahe+w6Qhl4SFoPvPsZ9NPHY4bwass+LCgU7RK3PBoVQlQ3G1s7vI8W3CYyJiEXcbKF7FIM/L8q3Q=="
+    },
     "jsdom": {
       "version": "16.6.0",
       "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-16.6.0.tgz",
diff --git a/package.json b/package.json
index 7771bfd..d11574d 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
   "dependencies": {
     "@solana/web3.js": "^1.10.1",
     "assert": "^2.0.0",
-    "buffer": "^6.0.1"
+    "buffer": "^6.0.1",
+    "jsbi": "^3.1.5"
   }
 }
diff --git a/src/index.ts b/src/index.ts
index 03d86f8..2ddf2ea 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,6 @@
 import { PublicKey } from '@solana/web3.js'
 import { Buffer } from 'buffer'
+import JSBI from 'jsbi'
 import { readBigInt64LE, readBigUInt64LE } from './readBig'
 
 export const Magic = 0xa1b2c3d4
@@ -39,13 +40,13 @@ export interface ProductData extends Base {
 }
 
 export interface Price {
-  priceComponent: bigint
+  priceComponent: JSBI
   price: number
-  confidenceComponent: bigint
+  confidenceComponent: JSBI
   confidence: number
   status: number
   corporateAction: number
-  publishSlot: bigint
+  publishSlot: JSBI
 }
 
 export interface PriceComponent {
@@ -58,23 +59,23 @@ export interface PriceData extends Base, Price {
   priceType: number
   exponent: number
   numComponentPrices: number
-  currentSlot: bigint
-  validSlot: bigint
-  twapComponent: bigint
+  currentSlot: JSBI
+  validSlot: JSBI
+  twapComponent: JSBI
   twap: number
-  avolComponent: bigint
+  avolComponent: JSBI
   avol: number
-  drv0Component: bigint
+  drv0Component: JSBI
   drv0: number
-  drv1Component: bigint
+  drv1Component: JSBI
   drv1: number
-  drv2Component: bigint
+  drv2Component: JSBI
   drv2: number
-  drv3Component: bigint
+  drv3Component: JSBI
   drv3: number
-  drv4Component: bigint
+  drv4Component: JSBI
   drv4: number
-  drv5Component: bigint
+  drv5Component: JSBI
   drv5: number
   productAccountKey: PublicKey
   nextPriceAccountKey: PublicKey | null
diff --git a/src/readBig.ts b/src/readBig.ts
index 5ec754f..a409801 100644
--- a/src/readBig.ts
+++ b/src/readBig.ts
@@ -1,4 +1,4 @@
-import { Buffer } from 'buffer'
+import JSBI from 'jsbi'
 
 // https://github.com/nodejs/node/blob/v14.17.0/lib/internal/errors.js#L758
 const ERR_BUFFER_OUT_OF_BOUNDS = () => new Error('Attempt to access memory outside buffer bounds')
@@ -29,21 +29,21 @@ function boundsError(value: number, length: number) {
 }
 
 // https://github.com/nodejs/node/blob/v14.17.0/lib/internal/buffer.js#L129-L145
-export function readBigInt64LE(buffer: Buffer, offset = 0): bigint {
+export function readBigInt64LE(buffer: Buffer, offset = 0): JSBI {
   validateNumber(offset, 'offset')
   const first = buffer[offset]
   const last = buffer[offset + 7]
   if (first === undefined || last === undefined) boundsError(offset, buffer.length - 8)
   // tslint:disable-next-line:no-bitwise
   const val = buffer[offset + 4] + buffer[offset + 5] * 2 ** 8 + buffer[offset + 6] * 2 ** 16 + (last << 24) // Overflow
-  return (
-    (BigInt(val) << BigInt(32)) + // tslint:disable-line:no-bitwise
-    BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24)
+  return JSBI.add(
+    JSBI.leftShift(JSBI.BigInt(val), JSBI.BigInt(32)), // tslint:disable-line:no-bitwise
+    JSBI.BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24),
   )
 }
 
 // https://github.com/nodejs/node/blob/v14.17.0/lib/internal/buffer.js#L89-L107
-export function readBigUInt64LE(buffer: Buffer, offset = 0): bigint {
+export function readBigUInt64LE(buffer: Buffer, offset = 0): JSBI {
   validateNumber(offset, 'offset')
   const first = buffer[offset]
   const last = buffer[offset + 7]
@@ -53,5 +53,5 @@ export function readBigUInt64LE(buffer: Buffer, offset = 0): bigint {
 
   const hi = buffer[++offset] + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + last * 2 ** 24
 
-  return BigInt(lo) + (BigInt(hi) << BigInt(32)) // tslint:disable-line:no-bitwise
+  return JSBI.add(JSBI.BigInt(lo), JSBI.leftShift(JSBI.BigInt(hi), JSBI.BigInt(32))) // tslint:disable-line:no-bitwise
 }
diff --git a/tsconfig.json b/tsconfig.json
index e305280..1e8cfdd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,8 +4,9 @@
     "module": "commonjs",
     "declaration": true,
     "outDir": "./lib",
-    "strict": true
+    "strict": true,
+    "esModuleInterop": true
   },
   "include": ["src"],
   "exclude": ["node_modules", "**/__tests__/*"]
-}
\ No newline at end of file
+}