diff --git a/applications/cli/src/main/resources/localcluster/templates/devnet/genesis-scripts/genesis-create-template.sh b/applications/cli/src/main/resources/localcluster/templates/devnet/genesis-scripts/genesis-create-template.sh
index ae68713..93ea8d4 100644
--- a/applications/cli/src/main/resources/localcluster/templates/devnet/genesis-scripts/genesis-create-template.sh
+++ b/applications/cli/src/main/resources/localcluster/templates/devnet/genesis-scripts/genesis-create-template.sh
@@ -7,7 +7,12 @@ set -e
   --gen-genesis-keys {{nGenesisKeys}} \
   --gen-utxo-keys {{nGenesisUtxoKeys}} \
   --supply {{genesisUtxoSupply}} \
+  {{^mainnet}}
   --testnet-magic {{protocolMagic}} \
+  {{/mainnet}}
+  {{#mainnet}}
+  --mainnet \
+  {{/mainnet}}
   --slot-coefficient {{activeSlotsCoeff}} \
   --byron-template ../genesis-templates/spec/byron.json \
   --shelley-template ../genesis-templates/spec/shelley.json \
diff --git a/applications/cli/src/main/resources/localcluster/templates/devnet/templates/configuration.yaml b/applications/cli/src/main/resources/localcluster/templates/devnet/templates/configuration.yaml
index ce25714..92501de 100644
--- a/applications/cli/src/main/resources/localcluster/templates/devnet/templates/configuration.yaml
+++ b/applications/cli/src/main/resources/localcluster/templates/devnet/templates/configuration.yaml
@@ -43,7 +43,7 @@ RequiresNetworkMagic: RequiresMagic
 
 # This protocol version number gets used by block producing nodes as part
 # of the system for agreeing on and synchronising protocol updates.
-LastKnownBlockVersion-Major: {{#mainnet}}2{{/mainnet}}{{^mainnet}}2{{/mainnet}}
+LastKnownBlockVersion-Major: {{#mainnet}}0{{/mainnet}}{{^mainnet}}2{{/mainnet}}
 LastKnownBlockVersion-Minor: 0
 LastKnownBlockVersion-Alt: 0