diff --git a/neo3-gui/neo3-gui/ClientApp/package-lock.json b/neo3-gui/neo3-gui/ClientApp/package-lock.json
index dbc16e1..b613440 100644
--- a/neo3-gui/neo3-gui/ClientApp/package-lock.json
+++ b/neo3-gui/neo3-gui/ClientApp/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "neo-gui",
-  "version": "1.2.5",
+  "version": "1.2.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/neo3-gui/neo3-gui/ClientApp/package.json b/neo3-gui/neo3-gui/ClientApp/package.json
index 2278e32..5189eb8 100644
--- a/neo3-gui/neo3-gui/ClientApp/package.json
+++ b/neo3-gui/neo3-gui/ClientApp/package.json
@@ -1,6 +1,6 @@
 {
     "name": "neo-gui",
-    "version": "1.2.5",
+    "version": "1.2.6",
     "private": true,
     "main": "main.js",
     "homepage": "./",
diff --git a/neo3-gui/neo3-gui/config.testnet.json b/neo3-gui/neo3-gui/config.testnet.json
index 470a2ee..ac5f48b 100644
--- a/neo3-gui/neo3-gui/config.testnet.json
+++ b/neo3-gui/neo3-gui/config.testnet.json
@@ -1,13 +1,13 @@
 {
   "ApplicationConfiguration": {
     "Logger": {
-      "Path": "Logs_{0}",
+      "Path": "Logs",
       "ConsoleOutput": false,
       "Active": false
     },
     "Storage": {
       "Engine": "LevelDBStore",
-      "Path": "Data_LevelDB_844378958"
+      "Path": "Data_LevelDB_877933390"
     },
     "P2P": {
       "Port": 20333,
@@ -21,9 +21,13 @@
     "PluginURL": "https://github.com/neo-project/neo-modules/releases/download/v{1}/{0}.zip"
   },
   "ProtocolConfiguration": {
-    "Network": 844378958,
+    "Network": 877933390,
+    "AddressVersion": 53,
     "MillisecondsPerBlock": 15000,
+    "MaxTransactionsPerBlock": 512,
+    "MemoryPoolMaxTransactions": 50000,
     "MaxTraceableBlocks": 2102400,
+    "InitialGasDistribution": 5200000000000000,
     "ValidatorsCount": 7,
     "StandbyCommittee": [
       "023e9b32ea89b94d066e649b124fd50e396ee91369e8e2a6ae1b11c170d022256d",
@@ -32,15 +36,28 @@
       "03408dcd416396f64783ac587ea1e1593c57d9fea880c8a6a1920e92a259477806",
       "02a7834be9b32e2981d157cb5bbd3acb42cfd11ea5c3b10224d7a44e98c5910f1b",
       "0214baf0ceea3a66f17e7e1e839ea25fd8bed6cd82e6bb6e68250189065f44ff01",
-      "030205e9cefaea5a1dfc580af20c8d5aa2468bb0148f1a5e4605fc622c80e604ba"
+      "030205e9cefaea5a1dfc580af20c8d5aa2468bb0148f1a5e4605fc622c80e604ba",
+      "025831cee3708e87d78211bec0d1bfee9f4c85ae784762f042e7f31c0d40c329b8",
+      "02cf9dc6e85d581480d91e88e8cbeaa0c153a046e89ded08b4cefd851e1d7325b5",
+      "03840415b0a0fcf066bcc3dc92d8349ebd33a6ab1402ef649bae00e5d9f5840828",
+      "026328aae34f149853430f526ecaa9cf9c8d78a4ea82d08bdf63dd03c4d0693be6",
+      "02c69a8d084ee7319cfecf5161ff257aa2d1f53e79bf6c6f164cff5d94675c38b3",
+      "0207da870cedb777fceff948641021714ec815110ca111ccc7a54c168e065bda70",
+      "035056669864feea401d8c31e447fb82dd29f342a9476cfd449584ce2a6165e4d7",
+      "0370c75c54445565df62cfe2e76fbec4ba00d1298867972213530cae6d418da636",
+      "03957af9e77282ae3263544b7b2458903624adc3f5dee303957cb6570524a5f254",
+      "03d84d22b8753cf225d263a3a782a4e16ca72ef323cfde04977c74f14873ab1e4c",
+      "02147c1b1d5728e1954958daff2f88ee2fa50a06890a8a9db3fa9e972b66ae559f",
+      "03c609bea5a4825908027e4ab217e7efc06e311f19ecad9d417089f14927a173d5",
+      "0231edee3978d46c335e851c76059166eb8878516f459e085c0dd092f0f1d51c21",
+      "03184b018d6b2bc093e535519732b3fd3f7551c8cffaf4621dd5a0b89482ca66c9"
     ],
     "SeedList": [
-      "seed1t.neo.org:20333",
-      "seed2t.neo.org:20333",
-      "seed3t.neo.org:20333",
-      "seed4t.neo.org:20333",
-      "seed5t.neo.org:20333"
+      "seed1t4.neo.org:20333",
+      "seed2t4.neo.org:20333",
+      "seed3t4.neo.org:20333",
+      "seed4t4.neo.org:20333",
+      "seed5t4.neo.org:20333"
     ]
   }
 }
-