diff --git a/src/call.ts b/src/call.ts
index ada637e..987d2b8 100644
--- a/src/call.ts
+++ b/src/call.ts
@@ -7,6 +7,7 @@ export async function all<T extends any[] = any[]>(
   calls: ContractCall[],
   multicallAddress: string,
   provider: ethers.providers.Provider,
+  blockTag?: number,
 ): Promise<T> {
   const multicall = new ethers.Contract(multicallAddress, multicallAbi, provider);
   const callRequests = calls.map(call => {
@@ -16,7 +17,9 @@ export async function all<T extends any[] = any[]>(
       callData,
     };
   });
-  const response = await multicall.aggregate(callRequests);
+  const response = await multicall.aggregate(callRequests, {
+    blockTag: blockTag,
+  });
   const callCount = calls.length;
   const callResult = [] as T;
   for (let i = 0; i < callCount; i++) {
diff --git a/src/provider.ts b/src/provider.ts
index cbedcfb..a47d2e5 100644
--- a/src/provider.ts
+++ b/src/provider.ts
@@ -24,11 +24,11 @@ export class Provider {
     return getEthBalance(address, this._multicallAddress);
   }
 
-  public async all<T extends any[] = any[]>(calls: ContractCall[]) {
+  public async all<T extends any[] = any[]>(calls: ContractCall[], blockTag?: number) {
     if (!this._provider) {
       throw new Error('Provider should be initialized before use.');
     }
-    return all<T>(calls, this._multicallAddress, this._provider);
+    return all<T>(calls, this._multicallAddress, this._provider, blockTag);
   }
 }