diff --git a/scripts/local_testnet/beacon_node.sh b/scripts/local_testnet/beacon_node.sh
index bb75da8d3a9..5c286e31978 100755
--- a/scripts/local_testnet/beacon_node.sh
+++ b/scripts/local_testnet/beacon_node.sh
@@ -20,4 +20,5 @@ exec lighthouse \
 	--enr-udp-port $2 \
 	--enr-tcp-port $2 \
 	--port $2 \
-	--http-port $3
+	--http-port $3 \
+	--target-peers $((NODE_COUNT - 1))
diff --git a/scripts/local_testnet/setup.sh b/scripts/local_testnet/setup.sh
index 4e86ec88064..85f1a5c17d0 100755
--- a/scripts/local_testnet/setup.sh
+++ b/scripts/local_testnet/setup.sh
@@ -22,7 +22,7 @@ GENESIS_TIME=`expr $NOW + $GENESIS_DELAY`
 
 
 lcli \
-	--spec mainnet \
+	--spec $SPEC_PRESET \
 	new-testnet \
 	--deposit-contract-address $DEPOSIT_CONTRACT_ADDRESS \
 	--testnet-dir $TESTNET_DIR \
@@ -49,7 +49,7 @@ echo Validators generated with keystore passwords at $DATADIR.
 echo "Building genesis state... (this might take a while)"
 
 lcli \
-	--spec mainnet \
+	--spec $SPEC_PRESET \
 	interop-genesis \
 	--genesis-time $GENESIS_TIME \
 	--testnet-dir $TESTNET_DIR \
diff --git a/scripts/local_testnet/vars.env b/scripts/local_testnet/vars.env
index 3152dd49f47..b3836b38b9f 100644
--- a/scripts/local_testnet/vars.env
+++ b/scripts/local_testnet/vars.env
@@ -28,3 +28,6 @@ NETWORK_ID=4242
 
 # Hard fork configuration
 ALTAIR_FORK_EPOCH=18446744073709551615
+
+# Spec version (mainnet or minimal)
+SPEC_PRESET=mainnet