diff --git a/types/libra-core/index.d.ts b/types/libra-core/index.d.ts
index 3dcccb1a23..bdf823769a 100644
--- a/types/libra-core/index.d.ts
+++ b/types/libra-core/index.d.ts
@@ -4,6 +4,8 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.4
 
+import BigNumber from 'bignumber.js';
+
 export type Signature = Uint8Array;
 
 export class KeyPair {
@@ -24,10 +26,10 @@ export type AccountStates = AccountState[];
 
 export class AccountState {
     readonly authenticationKey: Uint8Array;
-    readonly balance: any;
-    readonly receivedEventsCount: any;
-    readonly sentEventsCount: any;
-    readonly sequenceNumber: any;
+    readonly balance: BigNumber;
+    readonly receivedEventsCount: BigNumber;
+    readonly sentEventsCount: BigNumber;
+    readonly sequenceNumber: BigNumber;
 
     static default(address: string): AccountState;
 
@@ -113,19 +115,19 @@ export class LibraClient {
 
     getAccountTransaction(
         address: AccountAddressLike,
-        sequenceNumber: any,
-        fetchEvents?: boolean,
+        sequenceNumber: BigNumber | string | number,
+        fetchEvents?: boolean
     ): Promise<LibraSignedTransactionWithProof | null>;
 
     mintWithFaucetService(
         receiver: AccountAddress | string,
-        numCoins: any,
-        waitForConfirmation?: boolean,
+        numCoins: BigNumber | string | number,
+        waitForConfirmation?: boolean
     ): Promise<string>;
 
     waitForConfirmation(
         accountAddress: AccountAddress | string,
-        transactionSequenceNumber: any,
+        transactionSequenceNumber: number | string | BigNumber
     ): Promise<void>;
 
     signTransaction(transaction: LibraTransaction, keyPair: KeyPair): Promise<LibraSignedTransaction>;
@@ -133,7 +135,7 @@ export class LibraClient {
     transferCoins(
         sender: Account,
         recipientAddress: string,
-        numCoins: any,
+        numCoins: number | string | BigNumber
     ): Promise<LibraTransactionResponse>;
 
     execute(transaction: LibraTransaction, sender: Account): Promise<LibraTransactionResponse>;
@@ -338,28 +340,28 @@ export enum LibraProgramArgumentType {
 }
 
 export interface LibraGasConstraint {
-    maxGasAmount: any;
-    gasUnitPrice: any;
+    maxGasAmount: BigNumber;
+    gasUnitPrice: BigNumber;
 }
 
 export interface LibraTransaction {
     program: LibraProgram;
     gasConstraint: LibraGasConstraint;
-    expirationTime: any;
+    expirationTime: BigNumber;
     sendersAddress: Uint8Array;
-    sequenceNumber: any;
+    sequenceNumber: BigNumber;
 }
 
 export function LibraTransaction(
     program: LibraProgram,
     gasConstraint: LibraGasConstraint,
-    expirationTime: any,
+    expirationTime: BigNumber,
     sendersAddress: Uint8Array,
-    sequenceNumber: any,
+    sequenceNumber: BigNumber,
 ): void;
 
 export namespace LibraTransaction {
-    function createTransfer(recipientAddress: string, numAccount: any): LibraTransaction;
+    function createTransfer(recipientAddress: string, numAccount: BigNumber): LibraTransaction;
 }
 
 export interface LibraTransactionResponse {
@@ -407,7 +409,7 @@ export function LibraSignedTransaction(transaction: LibraTransaction, publicKey:
 
 export interface LibraTransactionEvent {
     data: Uint8Array;
-    sequenceNumber: any;
+    sequenceNumber: BigNumber;
     address?: AccountAddress;
     path?: Uint8Array;
 }
@@ -420,7 +422,7 @@ export interface LibraSignedTransactionWithProof {
 
 export function LibraSignedTransactionWithProof(signedTransaction: LibraSignedTransaction, proof?: object, events?: LibraTransactionEvent[]): void;
 
-export function LibraTransactionEvent(data: Uint8Array, sequenceNumber: any, address?: AccountAddress, path?: Uint8Array): void;
+export function LibraTransactionEvent(data: Uint8Array, sequenceNumber: BigNumber, address?: AccountAddress, path?: Uint8Array): void;
 
 export interface WalletConfig {
     mnemonic?: string;
diff --git a/types/libra-core/package.json b/types/libra-core/package.json
new file mode 100644
index 0000000000..b8fa481dee
--- /dev/null
+++ b/types/libra-core/package.json
@@ -0,0 +1,6 @@
+{
+    "private": true,
+    "dependencies": {
+        "bignumber.js": "9.0.0"
+    }
+}