diff --git a/.changeset/fifty-snakes-dream.md b/.changeset/fifty-snakes-dream.md
new file mode 100644
index 00000000..9705297e
--- /dev/null
+++ b/.changeset/fifty-snakes-dream.md
@@ -0,0 +1,5 @@
+---
+'@api3/contracts': patch
+---
+
+Update block explorer and verification API for ronin-testnet
diff --git a/.changeset/neat-tables-join.md b/.changeset/neat-tables-join.md
new file mode 100644
index 00000000..a4acf19f
--- /dev/null
+++ b/.changeset/neat-tables-join.md
@@ -0,0 +1,5 @@
+---
+'@api3/contracts': major
+---
+
+Update deprecated ronin-testnet chain ID from 2021 to 202601, reusing the same deployments under the existing alias
diff --git a/data/chains/ronin-testnet.json b/data/chains/ronin-testnet.json
index 368843ec..f86bbd35 100644
--- a/data/chains/ronin-testnet.json
+++ b/data/chains/ronin-testnet.json
@@ -1,8 +1,8 @@
 {
   "alias": "ronin-testnet",
-  "blockExplorerUrl": "https://saigon-app.roninchain.com/",
+  "blockExplorerUrl": "https://saigon-explorer.roninchain.com/",
   "decimals": 18,
-  "id": "2021",
+  "id": "202601",
   "name": "Ronin testnet",
   "providers": [
     {
@@ -13,6 +13,7 @@
   "symbol": "RON",
   "testnet": true,
   "verificationApi": {
-    "type": "sourcify"
+    "type": "blockscout",
+    "url": "https://saigon-explorer.roninchain.com/api"
   }
 }
diff --git a/deployments/addresses.json b/deployments/addresses.json
index 24d32204..d1b5ac2e 100644
--- a/deployments/addresses.json
+++ b/deployments/addresses.json
@@ -27,7 +27,6 @@
     "1868": "0x2AAE699ed04BBbD068f67a5b3C813eBB35f2c9E8",
     "1946": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "2020": "0x14A9E40FcAdA95A273ce3c8d4ccF7EA3280BDd26",
-    "2021": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "2221": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "2222": "0x2AAE699ed04BBbD068f67a5b3C813eBB35f2c9E8",
     "4801": "0x795E7417b5e9c70037654480F0371e202b48bC77",
@@ -54,6 +53,7 @@
     "167000": "0x2AAE699ed04BBbD068f67a5b3C813eBB35f2c9E8",
     "167013": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "200901": "0x2AAE699ed04BBbD068f67a5b3C813eBB35f2c9E8",
+    "202601": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "421614": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "534351": "0x795E7417b5e9c70037654480F0371e202b48bC77",
     "534352": "0x2AAE699ed04BBbD068f67a5b3C813eBB35f2c9E8",
@@ -93,7 +93,6 @@
     "1868": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "1946": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "2020": "0x25C6f371Cf8d4200B89dF84f9dE69d011013B086",
-    "2021": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "2221": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "2222": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "4801": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
@@ -120,6 +119,7 @@
     "167000": "0xF6d2675468989387e96127546e0CBC9A384fa418",
     "167013": "0x73E5e41f981365cD92180B040e8532693D84B32D",
     "200901": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
+    "202601": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "421614": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "534351": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
     "534352": "0x81bc85f329cDB28936FbB239f734AE495121F9A6",
@@ -159,7 +159,6 @@
     "1868": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "1946": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "2020": "0x55D72F0eb10e85D390B20DA57aa3122312647c0d",
-    "2021": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "2221": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "2222": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "4801": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
@@ -186,6 +185,7 @@
     "167000": "0x2ab9f26E18B64848cd349582ca3B55c2d06f507d",
     "167013": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "200901": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
+    "202601": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "421614": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "534351": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
     "534352": "0xcD7Df573B0F0bb4F2f8dFFF6650cDe8C77431730",
@@ -225,7 +225,6 @@
     "1868": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "1946": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "2020": "0x2ab9f26E18B64848cd349582ca3B55c2d06f507d",
-    "2021": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "2221": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "2222": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "4801": "0x709944a48cAf83535e43471680fDA4905FB3920a",
@@ -252,6 +251,7 @@
     "167000": "0x55Cf1079a115029a879ec3A11Ba5D453272eb61D",
     "167013": "0xA4C9a00aC42c3F8C81421eB7ad44bA076e70375d",
     "200901": "0x709944a48cAf83535e43471680fDA4905FB3920a",
+    "202601": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "421614": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "534351": "0x709944a48cAf83535e43471680fDA4905FB3920a",
     "534352": "0x709944a48cAf83535e43471680fDA4905FB3920a",
@@ -291,7 +291,6 @@
     "1868": "0x2E787629c3B7545271240A87197108823ce8303b",
     "1946": "0x2E787629c3B7545271240A87197108823ce8303b",
     "2020": "0x55Cf1079a115029a879ec3A11Ba5D453272eb61D",
-    "2021": "0x2E787629c3B7545271240A87197108823ce8303b",
     "2221": "0x2E787629c3B7545271240A87197108823ce8303b",
     "2222": "0x2E787629c3B7545271240A87197108823ce8303b",
     "4801": "0x2E787629c3B7545271240A87197108823ce8303b",
@@ -318,6 +317,7 @@
     "167000": "0x4DEA3120CDe98cC1535977a569bC109cB9Ea7afe",
     "167013": "0x4B69e2Bc4a2835a07104106DFD18D03548ebC4D8",
     "200901": "0x2E787629c3B7545271240A87197108823ce8303b",
+    "202601": "0x2E787629c3B7545271240A87197108823ce8303b",
     "421614": "0x2E787629c3B7545271240A87197108823ce8303b",
     "534351": "0x2E787629c3B7545271240A87197108823ce8303b",
     "534352": "0x2E787629c3B7545271240A87197108823ce8303b",
@@ -357,7 +357,6 @@
     "1868": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "1946": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "2020": "0x1DCE40DC2AfA7131C4838c8BFf635ae9d198d1cE",
-    "2021": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "2221": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "2222": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "4801": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
@@ -384,6 +383,7 @@
     "167000": "0x0cA813F8757197a2a0b0b13871953800ed884082",
     "167013": "0x75F5d5f22eB175B50b3C305d4Dd0CAfec4390A21",
     "200901": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
+    "202601": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "421614": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "534351": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
     "534352": "0x1Fe170311Cb13e3bfB96DeC8FAadcf97BF843381",
@@ -423,7 +423,6 @@
     "1868": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "1946": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "2020": "0x2b4401E59780e44d3b1Fd2D41FCb3047c830F286",
-    "2021": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "2221": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "2222": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "4801": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
@@ -450,6 +449,7 @@
     "167000": "0xCa69E397Ccb2E93fc5Bd2e260f0E0A7bd325e4D9",
     "167013": "0x6bA5ac44eebdB45D9E92Be870558b2517194dE7E",
     "200901": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
+    "202601": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "421614": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "534351": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
     "534352": "0x3f5C77BB36a16118ccC9Ca83ddEe8A01b6C01811",
@@ -490,7 +490,6 @@
     "1868": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "1946": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "2020": "0x5aB00E30453EEAd35025A761ED65d51d74574C24",
-    "2021": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "2221": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "2222": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "4801": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
@@ -517,6 +516,7 @@
     "167000": "0xb331c8826d1FF3987AFFe318DFF3eAc900914Fdc",
     "167013": "0x7AdBF5b35Db3c150f1f7d4Adf3C489a6916418D6",
     "200901": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
+    "202601": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "421614": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "534351": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
     "534352": "0x7B42df2563E128Ae3F68e2CFB1904808F61C8F12",
diff --git a/deployments/ronin-testnet/.chainId b/deployments/ronin-testnet/.chainId
index c5e035ca..ff371c01 100644
--- a/deployments/ronin-testnet/.chainId
+++ b/deployments/ronin-testnet/.chainId
@@ -1 +1 @@
-2021
\ No newline at end of file
+202601
\ No newline at end of file
diff --git a/src/generated/chains.ts b/src/generated/chains.ts
index 49ad7c53..7fd96e27 100644
--- a/src/generated/chains.ts
+++ b/src/generated/chains.ts
@@ -621,14 +621,14 @@ export const CHAINS: Chain[] = [
   },
   {
     alias: 'ronin-testnet',
-    blockExplorerUrl: 'https://saigon-app.roninchain.com/',
+    blockExplorerUrl: 'https://saigon-explorer.roninchain.com/',
     decimals: 18,
-    id: '2021',
+    id: '202601',
     name: 'Ronin testnet',
     providers: [{ alias: 'default', rpcUrl: 'https://saigon-testnet.roninchain.com/rpc' }],
     symbol: 'RON',
     testnet: true,
-    verificationApi: { type: 'sourcify' },
+    verificationApi: { type: 'blockscout', url: 'https://saigon-explorer.roninchain.com/api' },
   },
   {
     alias: 'ronin',