diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c13b6f..fed1f28 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [2.1.5] - 2026-06-25
+### Added Changes
+
+- Added support for Arc Testnet
+- Upgraded Modular SDK to 6.1.2
+
 ## [2.1.4] - 2025-12-09
 
 ### Added Changes
diff --git a/lib/constants/index.ts b/lib/constants/index.ts
index 9bf2b4f..b006acb 100644
--- a/lib/constants/index.ts
+++ b/lib/constants/index.ts
@@ -5,10 +5,12 @@ import { bsc, gnosis } from 'viem/chains';
 export const SupportedNetworks = [
   1, 10, 14, 30, 31, 50, 51, 56, 97, 100, 114, 122, 123, 137, 2357, 5000, 5003,
   8453, 10200, 42161, 42220, 43113, 43114, 44787, 59140, 59144, 80002, 84532,
-  421614, 534351, 534352, 11155111, 11155420, 28122024, 79479957, 888888888,
+  421614, 534351, 534352, 5042002, 11155111, 11155420, 28122024, 79479957,
+  888888888,
 ];
 
 export enum NetworkNames {
+  ArcTestnet = 'arcTestnet',
   BaseSepolia = 'baseSepolia',
   Sepolia = 'sepolia',
   Optimism = 'optimism',
@@ -69,6 +71,7 @@ export interface NetworkConfig {
 export const NETWORK_NAME_TO_CHAIN_ID: {
   [key: string]: number;
 } = {
+  [NetworkNames.ArcTestnet]: 5042002,
   [NetworkNames.BaseSepolia]: 84532,
   [NetworkNames.Sepolia]: 11155111,
   [NetworkNames.Optimism]: 10,
@@ -565,6 +568,39 @@ export const Networks: {
       hookMultiPlexer: '0xDcA918dd23456d321282DF9507F6C09A50522136',
     },
   },
+  [5042002]: {
+    chainId: 5042002,
+    chain: defineChain({
+      id: 5042002,
+      name: 'Arc Testnet',
+      nativeCurrency: {
+        decimals: 18,
+        name: 'USDC',
+        symbol: 'USDC',
+      },
+      rpcUrls: {
+        default: {
+          http: ['https://rpc.testnet.arc.network'],
+        },
+      },
+      blockExplorers: {
+        default: {
+          name: 'Arcscan',
+          url: 'https://testnet.arcscan.app',
+        },
+      },
+      testnet: true,
+    }),
+    bundler: 'https://testnet-rpc.etherspot.io/v2/5042002',
+    contracts: {
+      entryPoint: '0x0000000071727De22E5E9d8BAf0edAc6f37da032',
+      walletFactory: '0x38CC0EDdD3a944CA17981e0A19470d2298B8d43a',
+      bootstrap: '0xCF2808eA7d131d96E5C73Eb0eCD8Dc84D33905C7',
+      multipleOwnerECDSAValidator: '0x0eA25BF9F313344d422B513e1af679484338518E',
+      erc20SessionKeyValidator: '',
+      hookMultiPlexer: '0xDcA918dd23456d321282DF9507F6C09A50522136',
+    },
+  },
   [79479957]: {
     chainId: 79479957,
     chain: defineChain({
diff --git a/package-lock.json b/package-lock.json
index 013f289..d6f44c7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@etherspot/eip1271-verification-util": "0.1.2",
-        "@etherspot/modular-sdk": "6.1.1",
+        "@etherspot/modular-sdk": "6.1.2",
         "@zerodev/sdk": "^5.5.3",
         "buffer": "6.0.3",
         "lodash": "4.17.21",
@@ -1916,9 +1916,9 @@
       }
     },
     "node_modules/@etherspot/modular-sdk": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/@etherspot/modular-sdk/-/modular-sdk-6.1.1.tgz",
-      "integrity": "sha512-dueRoAYtXz+azYci6x/U2SJDTUqAI5fjuZA4ex7XaiCHxHjwCeo2is5ggUZXITTAC3UbsnjtZ8TKaYMeBzmXYw==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/@etherspot/modular-sdk/-/modular-sdk-6.1.2.tgz",
+      "integrity": "sha512-0M4h/377wV+sdnXqUrZESE+JPoicczgANQxvnnOlMWSS8jqgoOA61sqBmX8sblYBHo3F+aSvXvUXAd83AyWPwA==",
       "license": "MIT",
       "dependencies": {
         "@lifi/sdk": "2.5.0",
diff --git a/package.json b/package.json
index affc3ec..49f6070 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@etherspot/transaction-kit",
   "description": "Framework-agnostic Etherspot Transaction Kit",
-  "version": "2.1.4",
+  "version": "2.1.5",
   "main": "dist/cjs/index.js",
   "scripts": {
     "rollup:build": "NODE_OPTIONS=--max-old-space-size=8192 rollup -c --bundleConfigAsCjs",
@@ -25,7 +25,7 @@
   "homepage": "https://github.com/etherspot/transaction-kit#readme",
   "dependencies": {
     "@etherspot/eip1271-verification-util": "0.1.2",
-    "@etherspot/modular-sdk": "6.1.1",
+    "@etherspot/modular-sdk": "6.1.2",
     "@zerodev/sdk": "^5.5.3",
     "buffer": "6.0.3",
     "lodash": "4.17.21",