diff --git a/packages/providers/src.ts/json-rpc-provider.ts b/packages/providers/src.ts/json-rpc-provider.ts
index 75e46d6247..503458c0be 100644
--- a/packages/providers/src.ts/json-rpc-provider.ts
+++ b/packages/providers/src.ts/json-rpc-provider.ts
@@ -297,7 +297,8 @@ class UncheckedJsonRpcSigner extends JsonRpcSigner {
 
 const allowedTransactionKeys: { [ key: string ]: boolean } = {
     chainId: true, data: true, gasLimit: true, gasPrice:true, nonce: true, to: true, value: true,
-    type: true, accessList: true
+    type: true, accessList: true,
+    maxFeePerGas: true, maxPriorityFeePerGas: true
 }
 
 export class JsonRpcProvider extends BaseProvider {