diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index f03b1b9e..93c6d18f 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+## Changed
+
+- fix: recalculates body to use a fresh `Expiry` when polling for `read_state` requests. This prevents the request from exceeding the `maximum_ingress_expiry` when the replica is slow to respond.
+
 ## [2.1.2] - 2024-09-30
 - fix: revert https://github.com/dfinity/agent-js/pull/923 allow option to set agent replica time
 - fix: handle v3 traps correctly, pulling the reject_code and message from the certificate in the error response like v2.
diff --git a/packages/agent/src/agent/http/index.ts b/packages/agent/src/agent/http/index.ts
index b6c47bdf..f3aa840e 100644
--- a/packages/agent/src/agent/http/index.ts
+++ b/packages/agent/src/agent/http/index.ts
@@ -42,6 +42,7 @@ import { Ed25519PublicKey } from '../../public_key';
 import { decodeTime } from '../../utils/leb';
 import { ObservableLog } from '../../observable';
 import { BackoffStrategy, BackoffStrategyFactory, ExponentialBackoff } from '../../polling/backoff';
+import { DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS } from '../../constants';
 export * from './transforms';
 export { Nonce, makeNonce } from './types';
 
@@ -54,9 +55,6 @@ export enum RequestStatusResponseStatus {
   Done = 'done',
 }
 
-// Default delta for ingress expiry is 5 minutes.
-const DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS = 5 * 60 * 1000;
-
 // Root public key for the IC, encoded as hex
 export const IC_ROOT_KEY =
   '308182301d060d2b0601040182dc7c0503010201060c2b0601040182dc7c05030201036100814' +
@@ -779,7 +777,6 @@ export class HttpAgent implements Agent {
 
       const requestId = await requestIdOf(request);
 
-      // TODO: remove this any. This can be a Signed or UnSigned request.
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       let transformedRequest: HttpAgentRequest = await this._transform({
         request: {
@@ -946,9 +943,8 @@ export class HttpAgent implements Agent {
     }
     const sender = id?.getPrincipal() || Principal.anonymous();
 
-    // TODO: remove this any. This can be a Signed or UnSigned request.
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const transformedRequest: any = await this._transform({
+    const transformedRequest = await this._transform({
       request: {
         method: 'POST',
         headers: {
@@ -979,7 +975,14 @@ export class HttpAgent implements Agent {
     const canister = typeof canisterId === 'string' ? Principal.fromText(canisterId) : canisterId;
 
     const transformedRequest = request ?? (await this.createReadStateRequest(fields, identity));
-    const body = cbor.encode(transformedRequest.body);
+
+    // With read_state, we should always use a fresh expiry, even beyond the point where the initial request would have expired
+    const bodyWithAdjustedExpiry = {
+      ...transformedRequest.body,
+      ingress_expiry: new Expiry(DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS),
+    };
+
+    const body = cbor.encode(bodyWithAdjustedExpiry);
 
     this.log.print(
       `fetching "/api/v2/canister/${canister}/read_state" with request:`,
diff --git a/packages/agent/src/constants.ts b/packages/agent/src/constants.ts
new file mode 100644
index 00000000..b7182105
--- /dev/null
+++ b/packages/agent/src/constants.ts
@@ -0,0 +1,2 @@
+// Default delta for ingress expiry is 5 minutes.
+export const DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS = 5 * 60 * 1000;
diff --git a/packages/agent/src/polling/index.ts b/packages/agent/src/polling/index.ts
index ccd399eb..1518992e 100644
--- a/packages/agent/src/polling/index.ts
+++ b/packages/agent/src/polling/index.ts
@@ -1,11 +1,12 @@
 import { Principal } from '@dfinity/principal';
-import { Agent, RequestStatusResponseStatus } from '../agent';
+import { Agent, Expiry, RequestStatusResponseStatus } from '../agent';
 import { Certificate, CreateCertificateOptions, lookupResultToBuffer } from '../certificate';
 import { RequestId } from '../request_id';
 import { toHex } from '../utils/buffer';
 
 export * as strategy from './strategy';
 import { defaultStrategy } from './strategy';
+import { DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS } from '../constants';
 export { defaultStrategy } from './strategy';
 export type PollStrategy = (
   canisterId: Principal,
@@ -38,6 +39,10 @@ export async function pollForResponse(
 }> {
   const path = [new TextEncoder().encode('request_status'), requestId];
   const currentRequest = request ?? (await agent.createReadStateRequest?.({ paths: [path] }));
+
+  // Use a fresh expiry for the readState call.
+  currentRequest.body.content.ingress_expiry = new Expiry(DEFAULT_INGRESS_EXPIRY_DELTA_IN_MSECS);
+
   const state = await agent.readState(canisterId, { paths: [path] }, undefined, currentRequest);
   if (agent.rootKey == null) throw new Error('Agent root key not initialized before polling');
   const cert = await Certificate.create({