diff --git a/examples/router-pingpong/package-lock.json b/examples/router-pingpong/package-lock.json
index 47a48ca..196d89e 100644
--- a/examples/router-pingpong/package-lock.json
+++ b/examples/router-pingpong/package-lock.json
@@ -7,7 +7,12 @@
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       "devDependencies": {
         "@nomicfoundation/hardhat-toolbox": "^5.0.0",
-        "hardhat": "^2.22.12"
+        "@oasisprotocol/sapphire-hardhat": "^2.19.4",
+        "@routerprotocol/evm-gateway-contracts": "^1.1.13",
+        "dotenv": "^16.4.5",
+        "enquirer": "^2.4.1",
+        "hardhat": "^2.22.12",
+        "hardhat-switch-network": "^1.1.1"
       }
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     "node_modules/@adraffy/ens-normalize": {
@@ -940,7 +945,6 @@
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       "dev": true,
-      "peer": true,
       "engines": {
         "node": ">= 16"
       },
@@ -1500,6 +1504,62 @@
         "node": ">= 12"
       }
     },
+    "node_modules/@oasisprotocol/deoxysii": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/@oasisprotocol/deoxysii/-/deoxysii-0.0.6.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@oasisprotocol/sapphire-hardhat": {
+      "version": "2.22.2",
+      "resolved": "https://registry.npmjs.org/@oasisprotocol/sapphire-hardhat/-/sapphire-hardhat-2.22.2.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@oasisprotocol/sapphire-paratime": "^2.0.1"
+      },
+      "peerDependencies": {
+        "hardhat": "2.x"
+      }
+    },
+    "node_modules/@oasisprotocol/sapphire-paratime": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@oasisprotocol/sapphire-paratime/-/sapphire-paratime-2.3.0.tgz",
+      "integrity": "sha512-TooQ+eGxz8kQJ4PavqkXxvjbRJw8V4TB/Nu5ptaMyclFFr+tCWXEpx01gpoRsUEEc9IRcEm4IfnBUqFnBcbt7w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@noble/hashes": "1.3.2",
+        "@oasisprotocol/deoxysii": "0.0.6",
+        "cborg": "1.10.2"
+      }
+    },
+    "node_modules/@openzeppelin/contracts": {
+      "version": "4.9.6",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.9.6.tgz",
+      "integrity": "sha512-xSmezSupL+y9VkHZJGDoCBpmnB2ogM13ccaYDWqJTfS3dbuHkgjuwDFUmaFauBCboQMGB/S5UqUl2y54X99BmA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@openzeppelin/contracts-upgradeable": {
+      "version": "4.9.6",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-4.9.6.tgz",
+      "integrity": "sha512-m4iHazOsOCv1DgM7eD7GupTJ+NFVujRZt1wzddDPSVGpWdKq1SKkla5htKG7+IS4d2XOCtzkUNwRZ7Vq5aEUMA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@routerprotocol/evm-gateway-contracts": {
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/@routerprotocol/evm-gateway-contracts/-/evm-gateway-contracts-1.1.13.tgz",
+      "integrity": "sha512-XCjODM/AKx/WLc8pa9UzlatBBS73xkGBXDbSsFxq4XQUqO8ao7Gcnp61n9CoW8QN7wDKev+6tiHagia+piDzMg==",
+      "dev": true,
+      "dependencies": {
+        "@openzeppelin/contracts": "^4.4.1",
+        "@openzeppelin/contracts-upgradeable": "^4.7.3"
+      }
+    },
     "node_modules/@scure/base": {
       "version": "1.1.9",
       "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.9.tgz",
@@ -2425,6 +2485,16 @@
         "node": ">=12.19"
       }
     },
+    "node_modules/cborg": {
+      "version": "1.10.2",
+      "resolved": "https://registry.npmjs.org/cborg/-/cborg-1.10.2.tgz",
+      "integrity": "sha512-b3tFPA9pUr2zCUiCfRd2+wok2/LBSNUMKOuRRok+WlvvAgEt/PlbgPTsZUcwCOs53IJvLgTp0eotwtosE6njug==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "cborg": "cli.js"
+      }
+    },
     "node_modules/chai": {
       "version": "4.5.0",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.5.0.tgz",
@@ -3062,6 +3132,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/dotenv": {
+      "version": "16.6.1",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.6.1.tgz",
+      "integrity": "sha512-uBq4egWHTcTt33a72vpSG0z3HnPuIl6NqYcTrKEg2azoEyl2hpW0zqlxysq2pK9HlDIHyHyakeYaYnSAwd8bow==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/elliptic": {
       "version": "6.5.4",
       "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
@@ -3966,10 +4049,11 @@
       "dev": true
     },
     "node_modules/handlebars": {
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-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.8.tgz",
-      "integrity": "sha512-vafaFqs8MZkRrSX7sFVUdo3ap/eNiLnb4IakshzvP56X5Nr1iGKAIqdX6tMlm6HcNRIkr6AxO5jFEoJzzpT8aQ==",
+      "version": "4.7.9",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.9.tgz",
+      "integrity": "sha512-4E71E0rpOaQuJR2A3xDZ+GM1HyWYv1clR58tC8emQNeQe3RH7MAzSbat+V0wG78LQBo6m6bzSG/L4pBuCsgnUQ==",
       "dev": true,
+      "license": "MIT",
       "peer": true,
       "dependencies": {
         "minimist": "^1.2.5",
@@ -4079,6 +4163,19 @@
         "hardhat": "^2.0.2"
       }
     },
+    "node_modules/hardhat-switch-network": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/hardhat-switch-network/-/hardhat-switch-network-1.2.1.tgz",
+      "integrity": "sha512-nEEQpS8WtI8HoDP3Qek4vz2joC80dYr47l5LfuRxr8OIEaVN9Mh6s96PhMIXvoJTVlRKcF1eIhoniLkQb+Q17g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=16"
+      },
+      "peerDependencies": {
+        "hardhat": "^2.0.0"
+      }
+    },
     "node_modules/hardhat/node_modules/@noble/hashes": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.2.0.tgz",