diff --git a/bin/start-chain b/bin/start-chain
index 1b8c3e2..4c3f6d5 100755
--- a/bin/start-chain
+++ b/bin/start-chain
@@ -85,7 +85,7 @@ run-geth(){
      --unlock "$WALLETS" --password $KEY_DIR/frg-local-password \
      --identity $NETWORK_REF \
      --nousb \
-     --networkid 5 \
+     --networkid 99999999 \
      --port $((PORT-1)) \
      --rpcport $((PORT)) \
      --wsport $((PORT+1)) \
diff --git a/config/network_config.json b/config/network_config.json
index 7d94f15..0c2bf91 100644
--- a/config/network_config.json
+++ b/config/network_config.json
@@ -24,8 +24,8 @@
     "gas": 7989556,
     "gasPrice": 9000000000,
     "testOnlyHDWPasscode": "fragments",
-    "chainId": 5,
-    "network_id": 5
+    "chainId": 99999999,
+    "network_id": 99999999
   },
   "gethIntegration": {
     "ref": "geth-integration",
@@ -36,8 +36,8 @@
     "gas": 7989556,
     "gasPrice": 9000000000,
     "testOnlyHDWPasscode": "fragments",
-    "chainId": 5,
-    "network_id": 5
+    "chainId": 99999999,
+    "network_id": 99999999
   },
   "testrpcCoverage": {
     "ref": "testrpc-coverage",
@@ -47,7 +47,7 @@
     "networkId": "*",
     "gas": "0xfffffffffff",
     "gasPrice": "0x01",
-    "chainId": 5,
-    "network_id": 5 
+    "chainId": 99999999,
+    "network_id": 99999999
   }
 }