diff --git a/.github/workflows/tapir.yml b/.github/workflows/tapir.yml
index f2d747e54..918f939bf 100644
--- a/.github/workflows/tapir.yml
+++ b/.github/workflows/tapir.yml
@@ -10,7 +10,7 @@ on:
 
 # TODO: Use variables when GH supports it for forks. See https://github.com/orgs/community/discussions/44322
 env:
-  RPC_PROVIDER_URL: "https://polygon-mumbai-bor.publicnode.com"
+  RPC_PROVIDER_URL: "https://rpc-amoy.polygon.technology"
   ENCRYPTOR_PRIVATE_KEY: "0x900edb9e8214b2353f82aa195e915128f419a92cfb8bbc0f4784f10ef4112b86"
   CONSUMER_PRIVATE_KEY: "0xf307e165339cb5deb2b8ec59c31a5c0a957b8e8453ce7fe8a19d9a4c8acf36d4"
   RITUAL_ID: "0"
diff --git a/demos/taco-demo/README.md b/demos/taco-demo/README.md
index 356226297..982ed8036 100644
--- a/demos/taco-demo/README.md
+++ b/demos/taco-demo/README.md
@@ -27,7 +27,7 @@ production _just yet_.
 ### Lynx Testnet
 
 The current release of `@nucypher/taco` supports Ursulas working on Lynx (bleeding-edge) test
-network and contracts deployed on Mumbai testnet.
+network and contracts deployed on Polygon Amoy testnet.
 
 ## References
 
diff --git a/demos/taco-demo/src/App.tsx b/demos/taco-demo/src/App.tsx
index c2bf54e9b..118099df1 100644
--- a/demos/taco-demo/src/App.tsx
+++ b/demos/taco-demo/src/App.tsx
@@ -7,7 +7,7 @@ import {
   initialize,
   ThresholdMessageKit,
 } from '@nucypher/taco';
-import { Mumbai, useEthers } from '@usedapp/core';
+import { useEthers } from '@usedapp/core';
 import { ethers } from 'ethers';
 import React, { useEffect, useState } from 'react';
 
@@ -32,7 +32,7 @@ export default function App() {
 
   useEffect(() => {
     initialize();
-    switchNetwork(Mumbai.chainId);
+    switchNetwork(80002);
   }, []);
 
   const encryptMessage = async (message: string) => {
@@ -41,7 +41,7 @@ export default function App() {
     }
     setLoading(true);
 
-    await switchNetwork(Mumbai.chainId);
+    await switchNetwork(80002);
 
     const provider = new ethers.providers.Web3Provider(window.ethereum);
     const encryptedMessage = await encrypt(
diff --git a/demos/taco-demo/src/ConditionBuilder.tsx b/demos/taco-demo/src/ConditionBuilder.tsx
index e2c400545..1d14fa6cd 100644
--- a/demos/taco-demo/src/ConditionBuilder.tsx
+++ b/demos/taco-demo/src/ConditionBuilder.tsx
@@ -1,5 +1,5 @@
 import { conditions } from '@nucypher/taco';
-import { Mumbai, useEthers } from '@usedapp/core';
+import { useEthers } from '@usedapp/core';
 import React, { useState } from 'react';
 
 interface Props {
@@ -9,7 +9,7 @@ interface Props {
 }
 
 const rpcCondition = new conditions.base.rpc.RpcCondition({
-  chain: Mumbai.chainId,
+  chain: 80002,
   method: 'eth_getBalance',
   parameters: [':userAddress'],
   returnValueTest: {
diff --git a/demos/taco-demo/src/index.tsx b/demos/taco-demo/src/index.tsx
index 2a85089c7..648c0b278 100644
--- a/demos/taco-demo/src/index.tsx
+++ b/demos/taco-demo/src/index.tsx
@@ -1,11 +1,11 @@
-import { Config, DAppProvider, Mumbai } from '@usedapp/core';
+import { Config, DAppProvider } from '@usedapp/core';
 import React, { StrictMode } from 'react';
 import * as ReactDOMClient from 'react-dom/client';
 
 import App from './App';
 
 const config: Config = {
-  networks: [Mumbai],
+  readOnlyChainId: 80002,
 };
 const rootElement = document.getElementById('root');
 
diff --git a/demos/taco-nft-demo/README.md b/demos/taco-nft-demo/README.md
index dd8fca4d1..1b594b3b6 100644
--- a/demos/taco-nft-demo/README.md
+++ b/demos/taco-nft-demo/README.md
@@ -27,7 +27,7 @@ production _just yet_.
 ### Lynx Testnet
 
 The current release of `@nucypher/taco` supports Ursulas working on Lynx (bleeding-edge) test
-network and contracts deployed on Mumbai testnet.
+network and contracts deployed on Polygon Amoy testnet.
 
 ## References
 
diff --git a/demos/taco-nft-demo/src/App.tsx b/demos/taco-nft-demo/src/App.tsx
index 2fb5d26e4..e27e1847f 100644
--- a/demos/taco-nft-demo/src/App.tsx
+++ b/demos/taco-nft-demo/src/App.tsx
@@ -7,7 +7,7 @@ import {
   initialize,
   ThresholdMessageKit,
 } from '@nucypher/taco';
-import { Mumbai, useEthers } from '@usedapp/core';
+import { useEthers } from '@usedapp/core';
 import { ethers } from 'ethers';
 import React, { useEffect, useState } from 'react';
 
@@ -40,7 +40,7 @@ export default function App() {
     }
     setLoading(true);
 
-    await switchNetwork(Mumbai.chainId);
+    await switchNetwork(80002);
 
     const provider = new ethers.providers.Web3Provider(window.ethereum);
     const encryptedMessage = await encrypt(
diff --git a/demos/taco-nft-demo/src/index.tsx b/demos/taco-nft-demo/src/index.tsx
index 2a85089c7..648c0b278 100644
--- a/demos/taco-nft-demo/src/index.tsx
+++ b/demos/taco-nft-demo/src/index.tsx
@@ -1,11 +1,11 @@
-import { Config, DAppProvider, Mumbai } from '@usedapp/core';
+import { Config, DAppProvider } from '@usedapp/core';
 import React, { StrictMode } from 'react';
 import * as ReactDOMClient from 'react-dom/client';
 
 import App from './App';
 
 const config: Config = {
-  networks: [Mumbai],
+  readOnlyChainId: 80002,
 };
 const rootElement = document.getElementById('root');
 
diff --git a/examples/pre/nextjs/src/app/page.tsx b/examples/pre/nextjs/src/app/page.tsx
index 772dfe070..431db626e 100644
--- a/examples/pre/nextjs/src/app/page.tsx
+++ b/examples/pre/nextjs/src/app/page.tsx
@@ -37,12 +37,12 @@ function App() {
     const provider = new ethers.providers.Web3Provider(window.ethereum, 'any');
 
     const { chainId } = await provider.getNetwork();
-    const mumbaiChainId = 80001;
-    if (chainId !== mumbaiChainId) {
-      // Switch to Polygon Mumbai testnet
+    const amoyChainId = 80002;
+    if (chainId !== amoyChainId) {
+      // Switch to Polygon Amoy testnet
       await window.ethereum.request({
         method: 'wallet_switchEthereumChain',
-        params: [{ chainId: hexlify(mumbaiChainId) }],
+        params: [{ chainId: hexlify(amoyChainId) }],
       });
     }
 
diff --git a/examples/pre/nodejs/src/index.ts b/examples/pre/nodejs/src/index.ts
index c684fdf10..2a629e373 100644
--- a/examples/pre/nodejs/src/index.ts
+++ b/examples/pre/nodejs/src/index.ts
@@ -51,10 +51,10 @@ const runExample = async () => {
 
   const provider = new ethers.providers.JsonRpcProvider(rpcProviderUrl);
 
-  // Make sure the provider is connected to Mumbai testnet
+  // Make sure the provider is connected to Polygon Amoy testnet
   const network = await provider.getNetwork();
-  if (network.chainId !== 80001) {
-    console.error('Please connect to Mumbai testnet');
+  if (network.chainId !== 80002) {
+    console.error('Please connect to Polygon Amoy testnet');
   }
 
   const signer = new ethers.Wallet(privateKey);
diff --git a/examples/pre/react/src/App.tsx b/examples/pre/react/src/App.tsx
index 3bd6c2bc5..dbc9faeb6 100644
--- a/examples/pre/react/src/App.tsx
+++ b/examples/pre/react/src/App.tsx
@@ -33,12 +33,12 @@ function App() {
     const provider = new ethers.providers.Web3Provider(window.ethereum, 'any');
 
     const { chainId } = await provider.getNetwork();
-    const mumbaiChainId = 80001;
-    if (chainId !== mumbaiChainId) {
-      // Switch to Polygon Mumbai testnet
+    const amoyChainId = 80002;
+    if (chainId !== amoyChainId) {
+      // Switch to Polygon Amoy testnet
       await window.ethereum.request({
         method: 'wallet_switchEthereumChain',
-        params: [{ chainId: hexlify(mumbaiChainId) }],
+        params: [{ chainId: hexlify(amoyChainId) }],
       });
     }
 
diff --git a/examples/pre/webpack-5/src/index.ts b/examples/pre/webpack-5/src/index.ts
index eb555dc06..532b27b57 100644
--- a/examples/pre/webpack-5/src/index.ts
+++ b/examples/pre/webpack-5/src/index.ts
@@ -54,12 +54,12 @@ const runExample = async () => {
   await provider.send('eth_requestAccounts', []);
 
   const { chainId } = await provider.getNetwork();
-  const mumbaiChainId = 80001;
-  if (chainId !== mumbaiChainId) {
-    // Switch to Polygon Mumbai testnet
+  const amoyChainId = 80002;
+  if (chainId !== amoyChainId) {
+    // Switch to Polygon Amoy testnet
     await window.ethereum!.request!({
       method: 'wallet_switchEthereumChain',
-      params: [{ chainId: hexlify(mumbaiChainId) }],
+      params: [{ chainId: hexlify(amoyChainId) }],
     });
   }
 
diff --git a/examples/taco/nextjs/src/app/page.tsx b/examples/taco/nextjs/src/app/page.tsx
index 7f2c9cc49..2fe2a84bf 100644
--- a/examples/taco/nextjs/src/app/page.tsx
+++ b/examples/taco/nextjs/src/app/page.tsx
@@ -36,12 +36,12 @@ function App() {
     const provider = new ethers.providers.Web3Provider(window.ethereum, 'any');
 
     const { chainId } = await provider.getNetwork();
-    const mumbaiChainId = 80001;
-    if (chainId !== mumbaiChainId) {
-      // Switch to Polygon Mumbai testnet
+    const amoyChainId = 80002;
+    if (chainId !== amoyChainId) {
+      // Switch to Polygon Amoy testnet
       await window.ethereum.request({
         method: 'wallet_switchEthereumChain',
-        params: [{ chainId: hexlify(mumbaiChainId) }],
+        params: [{ chainId: hexlify(amoyChainId) }],
       });
     }
 
@@ -64,12 +64,14 @@ function App() {
   }
 
   const encryptMessage = async () => {
-    if(!provider) return;
-    setEncrypting(true)
+    if (!provider) {
+      return;
+    }
+    setEncrypting(true);
     try {
       const signer = provider.getSigner();
       const hasPositiveBalance = new conditions.base.rpc.RpcCondition({
-        chain: 80001,
+        chain: 80002,
         method: 'eth_getBalance',
         parameters: [':userAddress', 'latest'],
         returnValueTest: {
diff --git a/examples/taco/nodejs/.env.example b/examples/taco/nodejs/.env.example
index 377e44367..ef69135a5 100644
--- a/examples/taco/nodejs/.env.example
+++ b/examples/taco/nodejs/.env.example
@@ -1,6 +1,6 @@
-# URL for RPC blockchain provider. For TACo testnet you should use a Polygon Mumbai endpoint.
-# Current default extracted from https://chainlist.org/chain/80001, but ideally, you'll use your own endpoint.
-RPC_PROVIDER_URL=https://polygon-mumbai-bor.publicnode.com
+# URL for RPC blockchain provider. For TACo testnet you should use a Polygon Amoy endpoint.
+# Current default extracted from https://chainlist.org/chain/80002, but ideally, you'll use your own endpoint.
+RPC_PROVIDER_URL=https://rpc-amoy.polygon.technology
 # Hex-encoded private keys for the Encryptor and the Consumer.
 # We provide here some defaults, but we encourage you to choose your own.
 ENCRYPTOR_PRIVATE_KEY=0x900edb9e8214b2353f82aa195e915128f419a92cfb8bbc0f4784f10ef4112b86
diff --git a/examples/taco/nodejs/README.md b/examples/taco/nodejs/README.md
index a0a7578b8..bccebb083 100644
--- a/examples/taco/nodejs/README.md
+++ b/examples/taco/nodejs/README.md
@@ -6,7 +6,7 @@ This example shows how to use `@nucypher/taco` in Node.js.
 
 This script needs 3 environment variables, that you can set in the `.env` file:
 
-* `RPC_PROVIDER_URL`: For TACo testnet you should use a Polygon Mumbai endpoint.
+* `RPC_PROVIDER_URL`: For TACo testnet you should use a Polygon Amoy endpoint.
 * `ENCRYPTOR_PRIVATE_KEY` and `CONSUMER_PRIVATE_KEY`: Hex-encoded private keys for the Encryptor and the Consumer,
   respectively.
 
diff --git a/examples/taco/nodejs/src/index.ts b/examples/taco/nodejs/src/index.ts
index fefbd1340..42d453f1c 100644
--- a/examples/taco/nodejs/src/index.ts
+++ b/examples/taco/nodejs/src/index.ts
@@ -49,11 +49,8 @@ const encryptToBytes = async (messageString: string) => {
   const message = toBytes(messageString);
   console.log(format('Encrypting message ("%s") ...', messageString));
 
-  // TODO: Remove after fixing #506
-  const chain = domain === 'lynx' ? 80002 : 80001;
-
   const hasPositiveBalance = new conditions.base.rpc.RpcCondition({
-    chain,
+    chain: 80002,
     method: 'eth_getBalance',
     parameters: [':userAddress', 'latest'],
     returnValueTest: {
@@ -97,10 +94,10 @@ const decryptFromBytes = async (encryptedBytes: Uint8Array) => {
 };
 
 const runExample = async () => {
-  // Make sure the provider is connected to Mumbai testnet
+  // Make sure the provider is connected to Polygon Amoy testnet
   const network = await provider.getNetwork();
-  if (network.chainId !== 80001) {
-    console.error('Please connect to Mumbai testnet');
+  if (network.chainId !== 80002) {
+    console.error('Please connect to Polygon Amoy testnet');
   }
   await initialize();
 
diff --git a/examples/taco/react/src/App.tsx b/examples/taco/react/src/App.tsx
index 97f2155b1..6050685b5 100644
--- a/examples/taco/react/src/App.tsx
+++ b/examples/taco/react/src/App.tsx
@@ -33,12 +33,12 @@ function App() {
     const provider = new ethers.providers.Web3Provider(window.ethereum, 'any');
 
     const { chainId } = await provider.getNetwork();
-    const mumbaiChainId = 80001;
-    if (chainId !== mumbaiChainId) {
-      // Switch to Polygon Mumbai testnet
+    const amoyChainId = 80002;
+    if (chainId !== amoyChainId) {
+      // Switch to Polygon Amoy testnet
       await window.ethereum.request({
         method: 'wallet_switchEthereumChain',
-        params: [{ chainId: hexlify(mumbaiChainId) }],
+        params: [{ chainId: hexlify(amoyChainId) }],
       });
     }
 
@@ -61,12 +61,14 @@ function App() {
   }
 
   const encryptMessage = async () => {
-    if(!provider) return;
-    setEncrypting(true)
+    if (!provider) {
+      return;
+    }
+    setEncrypting(true);
     try {
       const signer = provider.getSigner();
       const hasPositiveBalance = new conditions.base.rpc.RpcCondition({
-        chain: 80001,
+        chain: 80002,
         method: 'eth_getBalance',
         parameters: [':userAddress', 'latest'],
         returnValueTest: {
@@ -91,9 +93,11 @@ function App() {
   }
 
   const decryptMessage = async () => {
-    if(!encryptedText || !provider) return
+    if (!encryptedText || !provider) {
+      return;
+    }
     try {
-      setDecrypting(true)
+      setDecrypting(true);
       const signer = provider.getSigner();
 
       console.log('Decrypting message...');
diff --git a/examples/taco/webpack-5/src/index.ts b/examples/taco/webpack-5/src/index.ts
index 86901c4d0..e7a80ebfa 100644
--- a/examples/taco/webpack-5/src/index.ts
+++ b/examples/taco/webpack-5/src/index.ts
@@ -25,12 +25,12 @@ const runExample = async () => {
   const signer = provider.getSigner();
 
   const { chainId } = await provider.getNetwork();
-  const mumbaiChainId = 80001;
-  if (chainId !== mumbaiChainId) {
-    // Switch to Polygon Mumbai testnet
+  const amoyChainId = 80002;
+  if (chainId !== amoyChainId) {
+    // Switch to Polygon Amoy testnet
     await window.ethereum!.request!({
       method: 'wallet_switchEthereumChain',
-      params: [{ chainId: hexlify(mumbaiChainId) }],
+      params: [{ chainId: hexlify(amoyChainId) }],
     });
   }
   console.log("Signer's address:", await signer.getAddress());
@@ -38,7 +38,7 @@ const runExample = async () => {
   console.log('Encrypting message...');
   const message = toBytes('this is a secret');
   const hasPositiveBalance = new conditions.base.rpc.RpcCondition({
-    chain: 80001,
+    chain: 80002,
     method: 'eth_getBalance',
     parameters: [':userAddress', 'latest'],
     returnValueTest: {
diff --git a/packages/shared/package.json b/packages/shared/package.json
index a4ff18ddd..87de6029e 100644
--- a/packages/shared/package.json
+++ b/packages/shared/package.json
@@ -42,7 +42,7 @@
   "dependencies": {
     "@ethersproject/abi": "^5.7.0",
     "@ethersproject/providers": "^5.7.2",
-    "@nucypher/nucypher-contracts": "^0.21.0",
+    "@nucypher/nucypher-contracts": "^0.22.0",
     "@nucypher/nucypher-core": "*",
     "axios": "^1.6.8",
     "deep-equal": "^2.2.3",
diff --git a/packages/shared/src/web3.ts b/packages/shared/src/web3.ts
index 82c53791d..97655c765 100644
--- a/packages/shared/src/web3.ts
+++ b/packages/shared/src/web3.ts
@@ -2,7 +2,6 @@ import { fromHexString } from './utils';
 
 export enum ChainId {
   POLYGON = 137,
-  MUMBAI = 80001, // TODO(#506): Deprecate MUMBAI
   AMOY = 80002,
   SEPOLIA = 11155111,
   ETHEREUM_MAINNET = 1,
diff --git a/packages/taco/src/conditions/const.ts b/packages/taco/src/conditions/const.ts
index 4323cb80c..45e0124f1 100644
--- a/packages/taco/src/conditions/const.ts
+++ b/packages/taco/src/conditions/const.ts
@@ -11,7 +11,6 @@ export const CONTEXT_PARAM_PREFIX = ':';
 
 export const SUPPORTED_CHAIN_IDS = [
   ChainId.POLYGON,
-  ChainId.MUMBAI, // TODO(#506): Deprecate MUMBAI
   ChainId.AMOY,
   ChainId.SEPOLIA,
   ChainId.ETHEREUM_MAINNET,
diff --git a/packages/taco/test/conditions/base/condition.test.ts b/packages/taco/test/conditions/base/condition.test.ts
index f725e9b5f..75b2d7acc 100644
--- a/packages/taco/test/conditions/base/condition.test.ts
+++ b/packages/taco/test/conditions/base/condition.test.ts
@@ -42,7 +42,6 @@ describe('validation', () => {
       chain: {
         _errors: [
           'Invalid literal value, expected 137',
-          'Invalid literal value, expected 80001', // TODO(#506): Deprecate MUMBAI
           'Invalid literal value, expected 80002',
           'Invalid literal value, expected 11155111',
           'Invalid literal value, expected 1',
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5abdebb61..9da913ff6 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -480,8 +480,8 @@ importers:
         specifier: ^5.7.2
         version: 5.7.2
       '@nucypher/nucypher-contracts':
-        specifier: ^0.21.0
-        version: 0.21.0
+        specifier: ^0.22.0
+        version: 0.22.0
       '@nucypher/nucypher-core':
         specifier: ^0.14.1
         version: 0.14.1
@@ -3600,8 +3600,8 @@ packages:
       '@nodelib/fs.scandir': 2.1.5
       fastq: 1.16.0
 
-  /@nucypher/nucypher-contracts@0.21.0:
-    resolution: {integrity: sha512-2ArdoHKNtPGJiTxhxlhhPrtg0YXPL/rbUy6EvtXVgw4Zwy4iJUw3n5calHcIzijyf4KZLc8wBdsGrCOpX5uC1A==}
+  /@nucypher/nucypher-contracts@0.22.0:
+    resolution: {integrity: sha512-poWxFBi2qL5KnPZYsqr4AWn/O26Z2Q6X9EoARjQZIZdcEqYvE6iMHHgiw/RKL036u1jh1/rzo44eZRCt6ErMpA==}
     dev: false
 
   /@nucypher/nucypher-core@0.14.1: