diff --git a/cardano_node_tests/cluster_scripts/babbage/genesis.alonzo.spec.json b/cardano_node_tests/cluster_scripts/babbage/genesis.alonzo.spec.json
index da1739b3e..abcaab932 100644
--- a/cardano_node_tests/cluster_scripts/babbage/genesis.alonzo.spec.json
+++ b/cardano_node_tests/cluster_scripts/babbage/genesis.alonzo.spec.json
@@ -1,371 +1,365 @@
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+      32,
+      65493,
+      32,
+      22558,
+      32,
+      16563,
+      32,
+      76511,
+      32,
+      196500,
+      453240,
+      220,
+      0,
+      1,
+      1,
+      69522,
+      11687,
+      0,
+      1,
+      60091,
+      32,
+      196500,
+      453240,
+      220,
+      0,
+      1,
+      1,
+      196500,
+      453240,
+      220,
+      0,
+      1,
+      1,
+      1159724,
+      392670,
+      0,
+      2,
+      806990,
+      30482,
+      4,
+      1927926,
+      82523,
+      4,
+      265318,
+      0,
+      4,
+      0,
+      85931,
+      32,
+      205665,
+      812,
+      1,
+      1,
+      41182,
+      32,
+      212342,
+      32,
+      31220,
+      32,
+      32696,
+      32,
+      43357,
+      32,
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+      32,
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+      32,
+      35892428,
+      10,
+      9462713,
+      1021,
+      10,
+      38887044,
+      32947,
+      10
+    ]
+  },
+  "executionPrices": {
+    "prMem": 0.0577,
+    "prSteps": 7.21e-05
+  },
+  "lovelacePerUTxOWord": 34482,
+  "maxBlockExUnits": {
+    "exUnitsMem": 62000000,
+    "exUnitsSteps": 40000000000
+  },
+  "maxCollateralInputs": 3,
+  "maxTxExUnits": {
+    "exUnitsMem": 14000000,
+    "exUnitsSteps": 10000000000
+  },
+  "maxValueSize": 5000
 }
diff --git a/cardano_node_tests/cluster_scripts/babbage/plutus-costmodels-secp256k1-enabled.json b/cardano_node_tests/cluster_scripts/babbage/plutus-costmodels-secp256k1-enabled.json
deleted file mode 100644
index 9e34db182..000000000
--- a/cardano_node_tests/cluster_scripts/babbage/plutus-costmodels-secp256k1-enabled.json
+++ /dev/null
@@ -1,347 +0,0 @@
-{
-        "PlutusV1": {
-		"addInteger-cpu-arguments-intercept": 205665,
-		"addInteger-cpu-arguments-slope": 812,
-		"addInteger-memory-arguments-intercept": 1,
-		"addInteger-memory-arguments-slope": 1,
-		"appendByteString-cpu-arguments-intercept": 1000,
-		"appendByteString-cpu-arguments-slope": 571,
-		"appendByteString-memory-arguments-intercept": 0,
-		"appendByteString-memory-arguments-slope": 1,
-		"appendString-cpu-arguments-intercept": 1000,
-		"appendString-cpu-arguments-slope": 24177,
-		"appendString-memory-arguments-intercept": 4,
-		"appendString-memory-arguments-slope": 1,
-		"bData-cpu-arguments": 1000,
-	        "bData-memory-arguments": 32,
- 		"blake2b_256-cpu-arguments-intercept": 117366,
-		"blake2b_256-cpu-arguments-slope": 10475,
-		"blake2b_256-memory-arguments": 4,
-		"cekApplyCost-exBudgetCPU": 23000,
-		"cekApplyCost-exBudgetMemory": 100,
-		"cekBuiltinCost-exBudgetCPU": 23000,
-		"cekBuiltinCost-exBudgetMemory": 100,
-		"cekConstCost-exBudgetCPU": 23000,
-		"cekConstCost-exBudgetMemory": 100,
-		"cekDelayCost-exBudgetCPU": 23000,
-		"cekDelayCost-exBudgetMemory": 100,
-		"cekForceCost-exBudgetCPU": 23000,
-		"cekForceCost-exBudgetMemory": 100,
-		"cekLamCost-exBudgetCPU": 23000,
-		"cekLamCost-exBudgetMemory": 100,
-		"cekStartupCost-exBudgetCPU": 100,
-		"cekStartupCost-exBudgetMemory": 100,
-		"cekVarCost-exBudgetCPU": 23000,
-		"cekVarCost-exBudgetMemory": 100,
-		"chooseData-cpu-arguments": 19537,
-		"chooseData-memory-arguments": 32,
-		"chooseList-cpu-arguments": 175354,
-		"chooseList-memory-arguments": 32,
-		"chooseUnit-cpu-arguments": 46417,
-		"chooseUnit-memory-arguments": 4,
-		"consByteString-cpu-arguments-intercept": 221973,
-		"consByteString-cpu-arguments-slope": 511,
-		"consByteString-memory-arguments-intercept": 0,
-		"consByteString-memory-arguments-slope": 1,
-		"constrData-cpu-arguments": 89141,
-		"constrData-memory-arguments": 32,
-		"decodeUtf8-cpu-arguments-intercept": 497525,
-		"decodeUtf8-cpu-arguments-slope": 14068,
-		"decodeUtf8-memory-arguments-intercept": 4,
-		"decodeUtf8-memory-arguments-slope": 2,
-		"divideInteger-cpu-arguments-constant": 196500,
-		"divideInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"divideInteger-cpu-arguments-model-arguments-slope": 220,
-		"divideInteger-memory-arguments-intercept": 0,
-		"divideInteger-memory-arguments-minimum": 1,
-		"divideInteger-memory-arguments-slope": 1,
-		"encodeUtf8-cpu-arguments-intercept": 1000,
-		"encodeUtf8-cpu-arguments-slope": 28662,
-		"encodeUtf8-memory-arguments-intercept": 4,
-		"encodeUtf8-memory-arguments-slope": 2,
-		"equalsByteString-cpu-arguments-constant": 245000,
-		"equalsByteString-cpu-arguments-intercept": 216773,
-		"equalsByteString-cpu-arguments-slope": 62,
-		"equalsByteString-memory-arguments": 1,
-		"equalsData-cpu-arguments-intercept": 1060367,
-		"equalsData-cpu-arguments-slope": 12586,
-		"equalsData-memory-arguments": 1,
-		"equalsInteger-cpu-arguments-intercept": 208512,
-		"equalsInteger-cpu-arguments-slope": 421,
-		"equalsInteger-memory-arguments": 1,
-		"equalsString-cpu-arguments-constant": 187000,
-		"equalsString-cpu-arguments-intercept": 1000,
-		"equalsString-cpu-arguments-slope": 52998,
-		"equalsString-memory-arguments": 1,
-		"fstPair-cpu-arguments": 80436,
-		"fstPair-memory-arguments": 32,
-		"headList-cpu-arguments": 43249,
-		"headList-memory-arguments": 32,
-		"iData-cpu-arguments": 1000,
-		"iData-memory-arguments": 32,
-		"ifThenElse-cpu-arguments": 80556,
-		"ifThenElse-memory-arguments": 1,
-		"indexByteString-cpu-arguments": 57667,
-		"indexByteString-memory-arguments": 4,
-		"lengthOfByteString-cpu-arguments": 1000,
-		"lengthOfByteString-memory-arguments": 10,
-		"lessThanByteString-cpu-arguments-intercept": 197145,
-		"lessThanByteString-cpu-arguments-slope": 156,
-		"lessThanByteString-memory-arguments": 1,
-		"lessThanEqualsByteString-cpu-arguments-intercept": 197145,
-		"lessThanEqualsByteString-cpu-arguments-slope": 156,
-		"lessThanEqualsByteString-memory-arguments": 1,
-		"lessThanEqualsInteger-cpu-arguments-intercept": 204924,
-		"lessThanEqualsInteger-cpu-arguments-slope": 473,
-		"lessThanEqualsInteger-memory-arguments": 1,
-		"lessThanInteger-cpu-arguments-intercept": 208896,
-		"lessThanInteger-cpu-arguments-slope": 511,
-		"lessThanInteger-memory-arguments": 1,
-		"listData-cpu-arguments": 52467,
-		"listData-memory-arguments": 32,
-		"mapData-cpu-arguments": 64832,
-		"mapData-memory-arguments": 32,
-		"mkCons-cpu-arguments": 65493,
-		"mkCons-memory-arguments": 32,
-		"mkNilData-cpu-arguments": 22558,
-		"mkNilData-memory-arguments": 32,
-		"mkNilPairData-cpu-arguments": 16563,
-		"mkNilPairData-memory-arguments": 32,
-		"mkPairData-cpu-arguments": 76511,
-		"mkPairData-memory-arguments": 32,
-		"modInteger-cpu-arguments-constant": 196500,
-		"modInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"modInteger-cpu-arguments-model-arguments-slope": 220,
-		"modInteger-memory-arguments-intercept": 0,
-		"modInteger-memory-arguments-minimum": 1,
-		"modInteger-memory-arguments-slope": 1,
-		"multiplyInteger-cpu-arguments-intercept": 69522,
-		"multiplyInteger-cpu-arguments-slope": 11687,
-		"multiplyInteger-memory-arguments-intercept": 0,
-		"multiplyInteger-memory-arguments-slope": 1,
-		"nullList-cpu-arguments": 60091,
-		"nullList-memory-arguments": 32,
-		"quotientInteger-cpu-arguments-constant": 196500,
-		"quotientInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"quotientInteger-cpu-arguments-model-arguments-slope": 220,
-		"quotientInteger-memory-arguments-intercept": 0,
-		"quotientInteger-memory-arguments-minimum": 1,
-		"quotientInteger-memory-arguments-slope": 1,
-		"remainderInteger-cpu-arguments-constant": 196500,
-		"remainderInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"remainderInteger-cpu-arguments-model-arguments-slope": 220,
-		"remainderInteger-memory-arguments-intercept": 0,
-		"remainderInteger-memory-arguments-minimum": 1,
-		"remainderInteger-memory-arguments-slope": 1,
-		"sha2_256-cpu-arguments-intercept": 806990,
-		"sha2_256-cpu-arguments-slope": 30482,
-		"sha2_256-memory-arguments": 4,
-		"sha3_256-cpu-arguments-intercept": 1927926,
-		"sha3_256-cpu-arguments-slope": 82523,
-		"sha3_256-memory-arguments": 4,
-		"sliceByteString-cpu-arguments-intercept": 265318,
-		"sliceByteString-cpu-arguments-slope": 0,
-		"sliceByteString-memory-arguments-intercept": 4,
-		"sliceByteString-memory-arguments-slope": 0,
-		"sndPair-cpu-arguments": 85931,
-		"sndPair-memory-arguments": 32,
-		"subtractInteger-cpu-arguments-intercept": 205665,
-		"subtractInteger-cpu-arguments-slope": 812,
-		"subtractInteger-memory-arguments-intercept": 1,
-		"subtractInteger-memory-arguments-slope": 1,
-		"tailList-cpu-arguments": 41182,
-		"tailList-memory-arguments": 32,
-		"trace-cpu-arguments": 212342,
-		"trace-memory-arguments": 32,
-		"unBData-cpu-arguments": 31220,
-		"unBData-memory-arguments": 32,
-		"unConstrData-cpu-arguments": 32696,
-		"unConstrData-memory-arguments": 32,
-		"unIData-cpu-arguments": 43357,
-		"unIData-memory-arguments": 32,
-		"unListData-cpu-arguments": 32247,
-		"unListData-memory-arguments": 32,
-		"unMapData-cpu-arguments": 38314,
-		"unMapData-memory-arguments": 32,
-		"verifyEd25519Signature-cpu-arguments-intercept": 9462713,
-		"verifyEd25519Signature-cpu-arguments-slope": 1021,
-		"verifyEd25519Signature-memory-arguments": 10
-        },
-        "PlutusV2": {
-		"addInteger-cpu-arguments-intercept": 205665,
-		"addInteger-cpu-arguments-slope": 812,
-		"addInteger-memory-arguments-intercept": 1,
-		"addInteger-memory-arguments-slope": 1,
-		"appendByteString-cpu-arguments-intercept": 1000,
-		"appendByteString-cpu-arguments-slope": 571,
-		"appendByteString-memory-arguments-intercept": 0,
-		"appendByteString-memory-arguments-slope": 1,
-		"appendString-cpu-arguments-intercept": 1000,
-		"appendString-cpu-arguments-slope": 24177,
-		"appendString-memory-arguments-intercept": 4,
-		"appendString-memory-arguments-slope": 1,
-		"bData-cpu-arguments": 1000,
-		"bData-memory-arguments": 32,
-		"blake2b_256-cpu-arguments-intercept": 117366,
-		"blake2b_256-cpu-arguments-slope": 10475,
-		"blake2b_256-memory-arguments": 4,
-		"cekApplyCost-exBudgetCPU": 23000,
-		"cekApplyCost-exBudgetMemory": 100,
-		"cekBuiltinCost-exBudgetCPU": 23000,
-		"cekBuiltinCost-exBudgetMemory": 100,
-		"cekConstCost-exBudgetCPU": 23000,
-		"cekConstCost-exBudgetMemory": 100,
-		"cekDelayCost-exBudgetCPU": 23000,
-		"cekDelayCost-exBudgetMemory": 100,
-		"cekForceCost-exBudgetCPU": 23000,
-		"cekForceCost-exBudgetMemory": 100,
-		"cekLamCost-exBudgetCPU": 23000,
-		"cekLamCost-exBudgetMemory": 100,
-		"cekStartupCost-exBudgetCPU": 100,
-		"cekStartupCost-exBudgetMemory": 100,
-		"cekVarCost-exBudgetCPU": 23000,
-		"cekVarCost-exBudgetMemory": 100,
-		"chooseData-cpu-arguments": 19537,
-		"chooseData-memory-arguments": 32,
-		"chooseList-cpu-arguments": 175354,
-		"chooseList-memory-arguments": 32,
-		"chooseUnit-cpu-arguments": 46417,
-		"chooseUnit-memory-arguments": 4,
-		"consByteString-cpu-arguments-intercept": 221973,
-		"consByteString-cpu-arguments-slope": 511,
-		"consByteString-memory-arguments-intercept": 0,
-		"consByteString-memory-arguments-slope": 1,
-		"constrData-cpu-arguments": 89141,
-		"constrData-memory-arguments": 32,
-		"decodeUtf8-cpu-arguments-intercept": 497525,
-		"decodeUtf8-cpu-arguments-slope": 14068,
-		"decodeUtf8-memory-arguments-intercept": 4,
-		"decodeUtf8-memory-arguments-slope": 2,
-		"divideInteger-cpu-arguments-constant": 196500,
-		"divideInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"divideInteger-cpu-arguments-model-arguments-slope": 220,
-		"divideInteger-memory-arguments-intercept": 0,
-		"divideInteger-memory-arguments-minimum": 1,
-		"divideInteger-memory-arguments-slope": 1,
-		"encodeUtf8-cpu-arguments-intercept": 1000,
-		"encodeUtf8-cpu-arguments-slope": 28662,
-		"encodeUtf8-memory-arguments-intercept": 4,
-		"encodeUtf8-memory-arguments-slope": 2,
-		"equalsByteString-cpu-arguments-constant": 245000,
-		"equalsByteString-cpu-arguments-intercept": 216773,
-		"equalsByteString-cpu-arguments-slope": 62,
-		"equalsByteString-memory-arguments": 1,
-		"equalsData-cpu-arguments-intercept": 1060367,
-		"equalsData-cpu-arguments-slope": 12586,
-		"equalsData-memory-arguments": 1,
-		"equalsInteger-cpu-arguments-intercept": 208512,
-		"equalsInteger-cpu-arguments-slope": 421,
-		"equalsInteger-memory-arguments": 1,
-		"equalsString-cpu-arguments-constant": 187000,
-		"equalsString-cpu-arguments-intercept": 1000,
-		"equalsString-cpu-arguments-slope": 52998,
-		"equalsString-memory-arguments": 1,
-		"fstPair-cpu-arguments": 80436,
-		"fstPair-memory-arguments": 32,
-		"headList-cpu-arguments": 43249,
-		"headList-memory-arguments": 32,
-		"iData-cpu-arguments": 1000,
-		"iData-memory-arguments": 32,
-		"ifThenElse-cpu-arguments": 80556,
-		"ifThenElse-memory-arguments": 1,
-		"indexByteString-cpu-arguments": 57667,
-		"indexByteString-memory-arguments": 4,
-		"lengthOfByteString-cpu-arguments": 1000,
-		"lengthOfByteString-memory-arguments": 10,
-		"lessThanByteString-cpu-arguments-intercept": 197145,
-		"lessThanByteString-cpu-arguments-slope": 156,
-		"lessThanByteString-memory-arguments": 1,
-		"lessThanEqualsByteString-cpu-arguments-intercept": 197145,
-		"lessThanEqualsByteString-cpu-arguments-slope": 156,
-		"lessThanEqualsByteString-memory-arguments": 1,
-		"lessThanEqualsInteger-cpu-arguments-intercept": 204924,
-		"lessThanEqualsInteger-cpu-arguments-slope": 473,
-		"lessThanEqualsInteger-memory-arguments": 1,
-		"lessThanInteger-cpu-arguments-intercept": 208896,
-		"lessThanInteger-cpu-arguments-slope": 511,
-		"lessThanInteger-memory-arguments": 1,
-		"listData-cpu-arguments": 52467,
-		"listData-memory-arguments": 32,
-		"mapData-cpu-arguments": 64832,
-		"mapData-memory-arguments": 32,
-		"mkCons-cpu-arguments": 65493,
-		"mkCons-memory-arguments": 32,
-		"mkNilData-cpu-arguments": 22558,
-		"mkNilData-memory-arguments": 32,
-		"mkNilPairData-cpu-arguments": 16563,
-		"mkNilPairData-memory-arguments": 32,
-		"mkPairData-cpu-arguments": 76511,
-		"mkPairData-memory-arguments": 32,
-		"modInteger-cpu-arguments-constant": 196500,
-		"modInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"modInteger-cpu-arguments-model-arguments-slope": 220,
-		"modInteger-memory-arguments-intercept": 0,
-		"modInteger-memory-arguments-minimum": 1,
-		"modInteger-memory-arguments-slope": 1,
-		"multiplyInteger-cpu-arguments-intercept": 69522,
-		"multiplyInteger-cpu-arguments-slope": 11687,
-		"multiplyInteger-memory-arguments-intercept": 0,
-		"multiplyInteger-memory-arguments-slope": 1,
-		"nullList-cpu-arguments": 60091,
-		"nullList-memory-arguments": 32,
-		"quotientInteger-cpu-arguments-constant": 196500,
-		"quotientInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"quotientInteger-cpu-arguments-model-arguments-slope": 220,
-		"quotientInteger-memory-arguments-intercept": 0,
-		"quotientInteger-memory-arguments-minimum": 1,
-		"quotientInteger-memory-arguments-slope": 1,
-		"remainderInteger-cpu-arguments-constant": 196500,
-		"remainderInteger-cpu-arguments-model-arguments-intercept": 453240,
-		"remainderInteger-cpu-arguments-model-arguments-slope": 220,
-		"remainderInteger-memory-arguments-intercept": 0,
-		"remainderInteger-memory-arguments-minimum": 1,
-		"remainderInteger-memory-arguments-slope": 1,
-		"serialiseData-cpu-arguments-intercept": 1159724,
-		"serialiseData-cpu-arguments-slope": 392670,
-		"serialiseData-memory-arguments-intercept": 0,
-		"serialiseData-memory-arguments-slope": 2,
-		"sha2_256-cpu-arguments-intercept": 806990,
-		"sha2_256-cpu-arguments-slope": 30482,
-		"sha2_256-memory-arguments": 4,
-		"sha3_256-cpu-arguments-intercept": 1927926,
-		"sha3_256-cpu-arguments-slope": 82523,
-		"sha3_256-memory-arguments": 4,
-		"sliceByteString-cpu-arguments-intercept": 265318,
-		"sliceByteString-cpu-arguments-slope": 0,
-		"sliceByteString-memory-arguments-intercept": 4,
-		"sliceByteString-memory-arguments-slope": 0,
-		"sndPair-cpu-arguments": 85931,
-		"sndPair-memory-arguments": 32,
-		"subtractInteger-cpu-arguments-intercept": 205665,
-		"subtractInteger-cpu-arguments-slope": 812,
-		"subtractInteger-memory-arguments-intercept": 1,
-		"subtractInteger-memory-arguments-slope": 1,
-		"tailList-cpu-arguments": 41182,
-		"tailList-memory-arguments": 32,
-		"trace-cpu-arguments": 212342,
-		"trace-memory-arguments": 32,
-		"unBData-cpu-arguments": 31220,
-		"unBData-memory-arguments": 32,
-		"unConstrData-cpu-arguments": 32696,
-		"unConstrData-memory-arguments": 32,
-		"unIData-cpu-arguments": 43357,
-		"unIData-memory-arguments": 32,
-		"unListData-cpu-arguments": 32247,
-		"unListData-memory-arguments": 32,
-		"unMapData-cpu-arguments": 38314,
-		"unMapData-memory-arguments": 32,
-		"verifyEcdsaSecp256k1Signature-cpu-arguments": 35892428,
-		"verifyEcdsaSecp256k1Signature-memory-arguments": 10,
-		"verifyEd25519Signature-cpu-arguments-intercept": 9462713,
-		"verifyEd25519Signature-cpu-arguments-slope": 1021,
-		"verifyEd25519Signature-memory-arguments": 10,
-		"verifySchnorrSecp256k1Signature-cpu-arguments-intercept": 38887044,
-		"verifySchnorrSecp256k1Signature-cpu-arguments-slope": 32947,
-		"verifySchnorrSecp256k1Signature-memory-arguments": 10
-	}
-    }
diff --git a/cardano_node_tests/cluster_scripts/babbage/start-cluster-hfc b/cardano_node_tests/cluster_scripts/babbage/start-cluster-hfc
index 3ea613259..92e653f99 100644
--- a/cardano_node_tests/cluster_scripts/babbage/start-cluster-hfc
+++ b/cardano_node_tests/cluster_scripts/babbage/start-cluster-hfc
@@ -4,7 +4,6 @@
 # DBSYNC_REPO - will start and configure db-sync if the value is path to db-sync repository
 # ENABLE_P2P - if set, local cluster will use P2P
 # MIXED_P2P - if set, local cluster will use P2P for some nodes and legacy topology for others
-# UPDATE_COST_MODEL - if set, PlutusV2 cost model will be made available through update proposal
 # DB_BACKEND - 'mem' or 'lmdb', default is 'mem' (or legacy) if unset
 # DRY_RUN - if set, will not start the cluster
 
@@ -134,7 +133,6 @@ cp "$SCRIPT_DIR/dbsync-config.yaml" "$STATE_CLUSTER"
 cp "$SCRIPT_DIR/submit-api-config.json" "$STATE_CLUSTER"
 cp "$SCRIPT_DIR/supervisor.conf" "$STATE_CLUSTER"
 cp "$SCRIPT_DIR"/genesis*.spec.json "$STATE_CLUSTER/shelley/"
-cp "$SCRIPT_DIR"/plutus-costmodels*.json "$STATE_CLUSTER/shelley/"
 
 if [ -n "${ENABLE_P2P:-""}" ]; then
   # use P2P topology files
@@ -227,15 +225,6 @@ jq -r '
 cat "$STATE_CLUSTER/shelley/genesis.json_jq" > "$STATE_CLUSTER/shelley/genesis.json"
 rm -f "$STATE_CLUSTER/shelley/genesis.json_jq"
 
-# delete PlutusV2 cost model when indicated
-if [ -n "${UPDATE_COST_MODEL:-""}" ]; then
-  jq -r '
-    del(.costModels.PlutusV2)' \
-    < "$STATE_CLUSTER/shelley/genesis.alonzo.json" > "$STATE_CLUSTER/shelley/genesis.alonzo.json_jq"
-  cat "$STATE_CLUSTER/shelley/genesis.alonzo.json_jq" > "$STATE_CLUSTER/shelley/genesis.alonzo.json"
-  rm -f "$STATE_CLUSTER/shelley/genesis.alonzo.json_jq"
-fi
-
 BYRON_GENESIS_HASH="$(cardano_cli_log byron genesis print-genesis-hash --genesis-json \
   "$STATE_CLUSTER/byron/genesis.json")"
 SHELLEY_GENESIS_HASH="$(cardano_cli_log genesis hash --genesis \
@@ -1068,114 +1057,19 @@ sleep "$NEXT_EPOCH_SLEEP"
 
 wait_for_era "Babbage"
 
-# update cost models when indicated
-if [ -n "${UPDATE_COST_MODEL:-""}" ]; then
-  sleep "$PROPOSAL_DELAY"
-  echo "Submitting update proposal to update cost model in Babbage"
-
-  COST_UPDATE_PROPOSAL="$STATE_CLUSTER/shelley/update-proposal-cost"
-
-  # dump cost models from alonzo genesis spec - the dump can be used verbatim for update proposal
-  jq -r '.costModels' < "$STATE_CLUSTER/shelley/genesis.alonzo.spec.json" \
-    > "${COST_UPDATE_PROPOSAL}-values.json"
-
-  cardano_cli_log governance create-update-proposal \
-    --out-file "${COST_UPDATE_PROPOSAL}.proposal" \
-    --epoch "$(get_epoch)" \
-    "${GENESIS_VERIFICATION[@]}" \
-    --cost-model-file "${COST_UPDATE_PROPOSAL}-values.json"
-
-  cardano_cli_log query protocol-parameters \
-    --testnet-magic "$NETWORK_MAGIC" \
-    --out-file "$STATE_CLUSTER/pparams.json"
-
-  STOP_TXIN_AMOUNT=$FEE_BUFFER
-
-  TXINS=()
-  TXIN_COUNT=0
-  TXIN_AMOUNT=0
-  while read -r txhash txix amount _; do
-    TXIN_AMOUNT="$((TXIN_AMOUNT + amount))"
-    TXIN_COUNT="$((TXIN_COUNT + 1))"
-    TXINS+=("--tx-in" "${txhash}#${txix}")
-    if [ "$TXIN_AMOUNT" -ge "$STOP_TXIN_AMOUNT" ]; then
-      break
-    fi
-  done <<< "$(cardano_cli_log query utxo --testnet-magic \
-              "$NETWORK_MAGIC" \
-              --address "$FAUCET_ADDR" |
-              grep -E "lovelace \+ TxOutDatumNone$")"
-
-  cardano_cli_log transaction build-raw \
-    --babbage-era \
-    --fee    0 \
-    "${TXINS[@]}" \
-    --tx-out "$FAUCET_ADDR+0" \
-    --update-proposal-file "${COST_UPDATE_PROPOSAL}.proposal" \
-    --out-file "${COST_UPDATE_PROPOSAL}-fee-tx.txbody"
-
-  FEE="$(cardano_cli_log transaction calculate-min-fee \
-          --testnet-magic "$NETWORK_MAGIC" \
-          --protocol-params-file "$STATE_CLUSTER"/pparams.json \
-          --tx-in-count 1 \
-          --tx-out-count 1 \
-          --witness-count 5 \
-          --byron-witness-count 0 \
-          --tx-body-file "${COST_UPDATE_PROPOSAL}-fee-tx.txbody" |
-          cut -d' ' -f1)"
-
-  TXOUT_AMOUNT="$((TXIN_AMOUNT - FEE))"
-
-  cardano_cli_log transaction build-raw \
-    --babbage-era \
-    --fee    "$FEE" \
-    "${TXINS[@]}" \
-    --tx-out "$FAUCET_ADDR+$TXOUT_AMOUNT" \
-    --update-proposal-file "${COST_UPDATE_PROPOSAL}.proposal" \
-    --out-file "${COST_UPDATE_PROPOSAL}-tx.txbody"
-
-  cardano_cli_log transaction sign \
-    --signing-key-file "$FAUCET_SKEY" \
-    "${DELEGATE_SIGNING[@]}" \
-    --testnet-magic    "$NETWORK_MAGIC" \
-    --tx-body-file     "${COST_UPDATE_PROPOSAL}-tx.txbody" \
-    --out-file         "${COST_UPDATE_PROPOSAL}-tx.tx"
-
-  cardano_cli_log transaction submit \
-    --tx-file "${COST_UPDATE_PROPOSAL}-tx.tx" \
-    --testnet-magic "$NETWORK_MAGIC"
-
-
-  BABBAGE_EPOCH="$(get_epoch)"
-
-  echo "Waiting $NEXT_EPOCH_SLEEP sec for Babbage era with updated cost model"
-  sleep "$NEXT_EPOCH_SLEEP"
-
-  wait_for_epoch "$((BABBAGE_EPOCH + 1))"
-
-  cardano_cli_log query protocol-parameters \
-    --testnet-magic "$NETWORK_MAGIC" \
-    --out-file "$STATE_CLUSTER/pparams.json"
-
-  COST_MODELS="$(jq ".costModels.PlutusScriptV2" < "$STATE_CLUSTER/pparams.json")"
-
-  [ "$COST_MODELS" != null ] || { echo "Unexpected cost models '$COST_MODELS' on line $LINENO" >&2; exit 1; }  # assert
-fi
-
-# update to PV8 and Secp256k1 cost model
+# update to PV8
 sleep "$PROPOSAL_DELAY"
-echo "Submitting update proposal to update to PV8 and update Secp256k1 cost model"
+echo "Submitting update proposal to update to PV8"
 
 BABBAGE_UPDATE_PROPOSAL_PV8="$STATE_CLUSTER/shelley/update-proposal-babbage-pv8"
 
-# protocol version + secp parameters update
+# protocol version 8
 cardano_cli_log governance create-update-proposal \
   --out-file "${BABBAGE_UPDATE_PROPOSAL_PV8}.proposal" \
   --epoch "$(get_epoch)" \
   "${GENESIS_VERIFICATION[@]}" \
   --protocol-major-version 8 \
-  --protocol-minor-version 0 \
-  --cost-model-file "$STATE_CLUSTER/shelley/plutus-costmodels-secp256k1-enabled.json"
+  --protocol-minor-version 0
 
 cardano_cli_log query protocol-parameters \
   --testnet-magic "$NETWORK_MAGIC" \
@@ -1242,14 +1136,19 @@ BABBAGE_EPOCH="$(get_epoch)"
 echo "Waiting $NEXT_EPOCH_SLEEP sec for Babbage era with PV8 to start"
 sleep "$NEXT_EPOCH_SLEEP"
 
+
+#
+# In Babbage era with PV8
+#
+
 wait_for_epoch "$((BABBAGE_EPOCH + 1))"
 
 cardano_cli_log query protocol-parameters \
   --testnet-magic "$NETWORK_MAGIC" \
   --out-file "$STATE_CLUSTER/pparams.json"
 
-SECP_VALUE="$(jq '.costModels.PlutusScriptV2."verifyEcdsaSecp256k1Signature-cpu-arguments"' < "$STATE_CLUSTER/pparams.json")"
+PROTOCOL_VERSION="$(jq ".protocolVersion.major" < "$STATE_CLUSTER/pparams.json")"
 
-[ "$SECP_VALUE" = "35892428" ] || { echo "Unexpected Secp256k1 cost model value '$SECP_VALUE' on line $LINENO" >&2; exit 1; }  # assert
+[ "$PROTOCOL_VERSION" = 8 ] || { echo "Unexpected protocol version '$PROTOCOL_VERSION' on line $LINENO" >&2; exit 1; }  # assert
 
 echo "Cluster started. Run \`$SCRIPT_DIR/stop-cluster-hfc\` to stop"
diff --git a/cardano_node_tests/cluster_scripts/babbage_fast/genesis.alonzo.spec.json b/cardano_node_tests/cluster_scripts/babbage_fast/genesis.alonzo.spec.json
index 3970561a6..abcaab932 100644
--- a/cardano_node_tests/cluster_scripts/babbage_fast/genesis.alonzo.spec.json
+++ b/cardano_node_tests/cluster_scripts/babbage_fast/genesis.alonzo.spec.json
@@ -1,371 +1,365 @@
 {
-    "lovelacePerUTxOWord": 34482,
-    "executionPrices": {
-        "prSteps": {
-            "numerator": 721,
-            "denominator": 10000000
-        },
-        "prMem": {
-            "numerator": 577,
-            "denominator": 10000
-        }
-    },
-    "maxTxExUnits": {
-        "exUnitsMem": 14000000,
-        "exUnitsSteps": 10000000000
-    },
-    "maxBlockExUnits": {
-        "exUnitsMem": 62000000,
-        "exUnitsSteps": 40000000000
-    },
-    "maxValueSize": 5000,
-    "collateralPercentage": 150,
-    "maxCollateralInputs": 3,
-    "costModels": {
-        "PlutusV1": {
-            "addInteger-cpu-arguments-intercept": 205665,
-            "addInteger-cpu-arguments-slope": 812,
-            "addInteger-memory-arguments-intercept": 1,
-            "addInteger-memory-arguments-slope": 1,
-            "appendByteString-cpu-arguments-intercept": 1000,
-            "appendByteString-cpu-arguments-slope": 571,
-            "appendByteString-memory-arguments-intercept": 0,
-            "appendByteString-memory-arguments-slope": 1,
-            "appendString-cpu-arguments-intercept": 1000,
-            "appendString-cpu-arguments-slope": 24177,
-            "appendString-memory-arguments-intercept": 4,
-            "appendString-memory-arguments-slope": 1,
-            "bData-cpu-arguments": 1000,
-            "bData-memory-arguments": 32,
-            "blake2b_256-cpu-arguments-intercept": 117366,
-            "blake2b_256-cpu-arguments-slope": 10475,
-            "blake2b_256-memory-arguments": 4,
-            "cekApplyCost-exBudgetCPU": 23000,
-            "cekApplyCost-exBudgetMemory": 100,
-            "cekBuiltinCost-exBudgetCPU": 23000,
-            "cekBuiltinCost-exBudgetMemory": 100,
-            "cekConstCost-exBudgetCPU": 23000,
-            "cekConstCost-exBudgetMemory": 100,
-            "cekDelayCost-exBudgetCPU": 23000,
-            "cekDelayCost-exBudgetMemory": 100,
-            "cekForceCost-exBudgetCPU": 23000,
-            "cekForceCost-exBudgetMemory": 100,
-            "cekLamCost-exBudgetCPU": 23000,
-            "cekLamCost-exBudgetMemory": 100,
-            "cekStartupCost-exBudgetCPU": 100,
-            "cekStartupCost-exBudgetMemory": 100,
-            "cekVarCost-exBudgetCPU": 23000,
-            "cekVarCost-exBudgetMemory": 100,
-            "chooseData-cpu-arguments": 19537,
-            "chooseData-memory-arguments": 32,
-            "chooseList-cpu-arguments": 175354,
-            "chooseList-memory-arguments": 32,
-            "chooseUnit-cpu-arguments": 46417,
-            "chooseUnit-memory-arguments": 4,
-            "consByteString-cpu-arguments-intercept": 221973,
-            "consByteString-cpu-arguments-slope": 511,
-            "consByteString-memory-arguments-intercept": 0,
-            "consByteString-memory-arguments-slope": 1,
-            "constrData-cpu-arguments": 89141,
-            "constrData-memory-arguments": 32,
-            "decodeUtf8-cpu-arguments-intercept": 497525,
-            "decodeUtf8-cpu-arguments-slope": 14068,
-            "decodeUtf8-memory-arguments-intercept": 4,
-            "decodeUtf8-memory-arguments-slope": 2,
-            "divideInteger-cpu-arguments-constant": 196500,
-            "divideInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "divideInteger-cpu-arguments-model-arguments-slope": 220,
-            "divideInteger-memory-arguments-intercept": 0,
-            "divideInteger-memory-arguments-minimum": 1,
-            "divideInteger-memory-arguments-slope": 1,
-            "encodeUtf8-cpu-arguments-intercept": 1000,
-            "encodeUtf8-cpu-arguments-slope": 28662,
-            "encodeUtf8-memory-arguments-intercept": 4,
-            "encodeUtf8-memory-arguments-slope": 2,
-            "equalsByteString-cpu-arguments-constant": 245000,
-            "equalsByteString-cpu-arguments-intercept": 216773,
-            "equalsByteString-cpu-arguments-slope": 62,
-            "equalsByteString-memory-arguments": 1,
-            "equalsData-cpu-arguments-intercept": 1060367,
-            "equalsData-cpu-arguments-slope": 12586,
-            "equalsData-memory-arguments": 1,
-            "equalsInteger-cpu-arguments-intercept": 208512,
-            "equalsInteger-cpu-arguments-slope": 421,
-            "equalsInteger-memory-arguments": 1,
-            "equalsString-cpu-arguments-constant": 187000,
-            "equalsString-cpu-arguments-intercept": 1000,
-            "equalsString-cpu-arguments-slope": 52998,
-            "equalsString-memory-arguments": 1,
-            "fstPair-cpu-arguments": 80436,
-            "fstPair-memory-arguments": 32,
-            "headList-cpu-arguments": 43249,
-            "headList-memory-arguments": 32,
-            "iData-cpu-arguments": 1000,
-            "iData-memory-arguments": 32,
-            "ifThenElse-cpu-arguments": 80556,
-            "ifThenElse-memory-arguments": 1,
-            "indexByteString-cpu-arguments": 57667,
-            "indexByteString-memory-arguments": 4,
-            "lengthOfByteString-cpu-arguments": 1000,
-            "lengthOfByteString-memory-arguments": 10,
-            "lessThanByteString-cpu-arguments-intercept": 197145,
-            "lessThanByteString-cpu-arguments-slope": 156,
-            "lessThanByteString-memory-arguments": 1,
-            "lessThanEqualsByteString-cpu-arguments-intercept": 197145,
-            "lessThanEqualsByteString-cpu-arguments-slope": 156,
-            "lessThanEqualsByteString-memory-arguments": 1,
-            "lessThanEqualsInteger-cpu-arguments-intercept": 204924,
-            "lessThanEqualsInteger-cpu-arguments-slope": 473,
-            "lessThanEqualsInteger-memory-arguments": 1,
-            "lessThanInteger-cpu-arguments-intercept": 208896,
-            "lessThanInteger-cpu-arguments-slope": 511,
-            "lessThanInteger-memory-arguments": 1,
-            "listData-cpu-arguments": 52467,
-            "listData-memory-arguments": 32,
-            "mapData-cpu-arguments": 64832,
-            "mapData-memory-arguments": 32,
-            "mkCons-cpu-arguments": 65493,
-            "mkCons-memory-arguments": 32,
-            "mkNilData-cpu-arguments": 22558,
-            "mkNilData-memory-arguments": 32,
-            "mkNilPairData-cpu-arguments": 16563,
-            "mkNilPairData-memory-arguments": 32,
-            "mkPairData-cpu-arguments": 76511,
-            "mkPairData-memory-arguments": 32,
-            "modInteger-cpu-arguments-constant": 196500,
-            "modInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "modInteger-cpu-arguments-model-arguments-slope": 220,
-            "modInteger-memory-arguments-intercept": 0,
-            "modInteger-memory-arguments-minimum": 1,
-            "modInteger-memory-arguments-slope": 1,
-            "multiplyInteger-cpu-arguments-intercept": 69522,
-            "multiplyInteger-cpu-arguments-slope": 11687,
-            "multiplyInteger-memory-arguments-intercept": 0,
-            "multiplyInteger-memory-arguments-slope": 1,
-            "nullList-cpu-arguments": 60091,
-            "nullList-memory-arguments": 32,
-            "quotientInteger-cpu-arguments-constant": 196500,
-            "quotientInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "quotientInteger-cpu-arguments-model-arguments-slope": 220,
-            "quotientInteger-memory-arguments-intercept": 0,
-            "quotientInteger-memory-arguments-minimum": 1,
-            "quotientInteger-memory-arguments-slope": 1,
-            "remainderInteger-cpu-arguments-constant": 196500,
-            "remainderInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "remainderInteger-cpu-arguments-model-arguments-slope": 220,
-            "remainderInteger-memory-arguments-intercept": 0,
-            "remainderInteger-memory-arguments-minimum": 1,
-            "remainderInteger-memory-arguments-slope": 1,
-            "sha2_256-cpu-arguments-intercept": 806990,
-            "sha2_256-cpu-arguments-slope": 30482,
-            "sha2_256-memory-arguments": 4,
-            "sha3_256-cpu-arguments-intercept": 1927926,
-            "sha3_256-cpu-arguments-slope": 82523,
-            "sha3_256-memory-arguments": 4,
-            "sliceByteString-cpu-arguments-intercept": 265318,
-            "sliceByteString-cpu-arguments-slope": 0,
-            "sliceByteString-memory-arguments-intercept": 4,
-            "sliceByteString-memory-arguments-slope": 0,
-            "sndPair-cpu-arguments": 85931,
-            "sndPair-memory-arguments": 32,
-            "subtractInteger-cpu-arguments-intercept": 205665,
-            "subtractInteger-cpu-arguments-slope": 812,
-            "subtractInteger-memory-arguments-intercept": 1,
-            "subtractInteger-memory-arguments-slope": 1,
-            "tailList-cpu-arguments": 41182,
-            "tailList-memory-arguments": 32,
-            "trace-cpu-arguments": 212342,
-            "trace-memory-arguments": 32,
-            "unBData-cpu-arguments": 31220,
-            "unBData-memory-arguments": 32,
-            "unConstrData-cpu-arguments": 32696,
-            "unConstrData-memory-arguments": 32,
-            "unIData-cpu-arguments": 43357,
-            "unIData-memory-arguments": 32,
-            "unListData-cpu-arguments": 32247,
-            "unListData-memory-arguments": 32,
-            "unMapData-cpu-arguments": 38314,
-            "unMapData-memory-arguments": 32,
-            "verifyEd25519Signature-cpu-arguments-intercept": 9462713,
-            "verifyEd25519Signature-cpu-arguments-slope": 1021,
-            "verifyEd25519Signature-memory-arguments": 10
-        },
-        "PlutusV2": {
-            "addInteger-cpu-arguments-intercept": 205665,
-            "addInteger-cpu-arguments-slope": 812,
-            "addInteger-memory-arguments-intercept": 1,
-            "addInteger-memory-arguments-slope": 1,
-            "appendByteString-cpu-arguments-intercept": 1000,
-            "appendByteString-cpu-arguments-slope": 571,
-            "appendByteString-memory-arguments-intercept": 0,
-            "appendByteString-memory-arguments-slope": 1,
-            "appendString-cpu-arguments-intercept": 1000,
-            "appendString-cpu-arguments-slope": 24177,
-            "appendString-memory-arguments-intercept": 4,
-            "appendString-memory-arguments-slope": 1,
-            "bData-cpu-arguments": 1000,
-            "bData-memory-arguments": 32,
-            "blake2b_256-cpu-arguments-intercept": 117366,
-            "blake2b_256-cpu-arguments-slope": 10475,
-            "blake2b_256-memory-arguments": 4,
-            "cekApplyCost-exBudgetCPU": 23000,
-            "cekApplyCost-exBudgetMemory": 100,
-            "cekBuiltinCost-exBudgetCPU": 23000,
-            "cekBuiltinCost-exBudgetMemory": 100,
-            "cekConstCost-exBudgetCPU": 23000,
-            "cekConstCost-exBudgetMemory": 100,
-            "cekDelayCost-exBudgetCPU": 23000,
-            "cekDelayCost-exBudgetMemory": 100,
-            "cekForceCost-exBudgetCPU": 23000,
-            "cekForceCost-exBudgetMemory": 100,
-            "cekLamCost-exBudgetCPU": 23000,
-            "cekLamCost-exBudgetMemory": 100,
-            "cekStartupCost-exBudgetCPU": 100,
-            "cekStartupCost-exBudgetMemory": 100,
-            "cekVarCost-exBudgetCPU": 23000,
-            "cekVarCost-exBudgetMemory": 100,
-            "chooseData-cpu-arguments": 19537,
-            "chooseData-memory-arguments": 32,
-            "chooseList-cpu-arguments": 175354,
-            "chooseList-memory-arguments": 32,
-            "chooseUnit-cpu-arguments": 46417,
-            "chooseUnit-memory-arguments": 4,
-            "consByteString-cpu-arguments-intercept": 221973,
-            "consByteString-cpu-arguments-slope": 511,
-            "consByteString-memory-arguments-intercept": 0,
-            "consByteString-memory-arguments-slope": 1,
-            "constrData-cpu-arguments": 89141,
-            "constrData-memory-arguments": 32,
-            "decodeUtf8-cpu-arguments-intercept": 497525,
-            "decodeUtf8-cpu-arguments-slope": 14068,
-            "decodeUtf8-memory-arguments-intercept": 4,
-            "decodeUtf8-memory-arguments-slope": 2,
-            "divideInteger-cpu-arguments-constant": 196500,
-            "divideInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "divideInteger-cpu-arguments-model-arguments-slope": 220,
-            "divideInteger-memory-arguments-intercept": 0,
-            "divideInteger-memory-arguments-minimum": 1,
-            "divideInteger-memory-arguments-slope": 1,
-            "encodeUtf8-cpu-arguments-intercept": 1000,
-            "encodeUtf8-cpu-arguments-slope": 28662,
-            "encodeUtf8-memory-arguments-intercept": 4,
-            "encodeUtf8-memory-arguments-slope": 2,
-            "equalsByteString-cpu-arguments-constant": 245000,
-            "equalsByteString-cpu-arguments-intercept": 216773,
-            "equalsByteString-cpu-arguments-slope": 62,
-            "equalsByteString-memory-arguments": 1,
-            "equalsData-cpu-arguments-intercept": 1060367,
-            "equalsData-cpu-arguments-slope": 12586,
-            "equalsData-memory-arguments": 1,
-            "equalsInteger-cpu-arguments-intercept": 208512,
-            "equalsInteger-cpu-arguments-slope": 421,
-            "equalsInteger-memory-arguments": 1,
-            "equalsString-cpu-arguments-constant": 187000,
-            "equalsString-cpu-arguments-intercept": 1000,
-            "equalsString-cpu-arguments-slope": 52998,
-            "equalsString-memory-arguments": 1,
-            "fstPair-cpu-arguments": 80436,
-            "fstPair-memory-arguments": 32,
-            "headList-cpu-arguments": 43249,
-            "headList-memory-arguments": 32,
-            "iData-cpu-arguments": 1000,
-            "iData-memory-arguments": 32,
-            "ifThenElse-cpu-arguments": 80556,
-            "ifThenElse-memory-arguments": 1,
-            "indexByteString-cpu-arguments": 57667,
-            "indexByteString-memory-arguments": 4,
-            "lengthOfByteString-cpu-arguments": 1000,
-            "lengthOfByteString-memory-arguments": 10,
-            "lessThanByteString-cpu-arguments-intercept": 197145,
-            "lessThanByteString-cpu-arguments-slope": 156,
-            "lessThanByteString-memory-arguments": 1,
-            "lessThanEqualsByteString-cpu-arguments-intercept": 197145,
-            "lessThanEqualsByteString-cpu-arguments-slope": 156,
-            "lessThanEqualsByteString-memory-arguments": 1,
-            "lessThanEqualsInteger-cpu-arguments-intercept": 204924,
-            "lessThanEqualsInteger-cpu-arguments-slope": 473,
-            "lessThanEqualsInteger-memory-arguments": 1,
-            "lessThanInteger-cpu-arguments-intercept": 208896,
-            "lessThanInteger-cpu-arguments-slope": 511,
-            "lessThanInteger-memory-arguments": 1,
-            "listData-cpu-arguments": 52467,
-            "listData-memory-arguments": 32,
-            "mapData-cpu-arguments": 64832,
-            "mapData-memory-arguments": 32,
-            "mkCons-cpu-arguments": 65493,
-            "mkCons-memory-arguments": 32,
-            "mkNilData-cpu-arguments": 22558,
-            "mkNilData-memory-arguments": 32,
-            "mkNilPairData-cpu-arguments": 16563,
-            "mkNilPairData-memory-arguments": 32,
-            "mkPairData-cpu-arguments": 76511,
-            "mkPairData-memory-arguments": 32,
-            "modInteger-cpu-arguments-constant": 196500,
-            "modInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "modInteger-cpu-arguments-model-arguments-slope": 220,
-            "modInteger-memory-arguments-intercept": 0,
-            "modInteger-memory-arguments-minimum": 1,
-            "modInteger-memory-arguments-slope": 1,
-            "multiplyInteger-cpu-arguments-intercept": 69522,
-            "multiplyInteger-cpu-arguments-slope": 11687,
-            "multiplyInteger-memory-arguments-intercept": 0,
-            "multiplyInteger-memory-arguments-slope": 1,
-            "nullList-cpu-arguments": 60091,
-            "nullList-memory-arguments": 32,
-            "quotientInteger-cpu-arguments-constant": 196500,
-            "quotientInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "quotientInteger-cpu-arguments-model-arguments-slope": 220,
-            "quotientInteger-memory-arguments-intercept": 0,
-            "quotientInteger-memory-arguments-minimum": 1,
-            "quotientInteger-memory-arguments-slope": 1,
-            "remainderInteger-cpu-arguments-constant": 196500,
-            "remainderInteger-cpu-arguments-model-arguments-intercept": 453240,
-            "remainderInteger-cpu-arguments-model-arguments-slope": 220,
-            "remainderInteger-memory-arguments-intercept": 0,
-            "remainderInteger-memory-arguments-minimum": 1,
-            "remainderInteger-memory-arguments-slope": 1,
-            "serialiseData-cpu-arguments-intercept": 1159724,
-            "serialiseData-cpu-arguments-slope": 392670,
-            "serialiseData-memory-arguments-intercept": 0,
-            "serialiseData-memory-arguments-slope": 2,
-            "sha2_256-cpu-arguments-intercept": 806990,
-            "sha2_256-cpu-arguments-slope": 30482,
-            "sha2_256-memory-arguments": 4,
-            "sha3_256-cpu-arguments-intercept": 1927926,
-            "sha3_256-cpu-arguments-slope": 82523,
-            "sha3_256-memory-arguments": 4,
-            "sliceByteString-cpu-arguments-intercept": 265318,
-            "sliceByteString-cpu-arguments-slope": 0,
-            "sliceByteString-memory-arguments-intercept": 4,
-            "sliceByteString-memory-arguments-slope": 0,
-            "sndPair-cpu-arguments": 85931,
-            "sndPair-memory-arguments": 32,
-            "subtractInteger-cpu-arguments-intercept": 205665,
-            "subtractInteger-cpu-arguments-slope": 812,
-            "subtractInteger-memory-arguments-intercept": 1,
-            "subtractInteger-memory-arguments-slope": 1,
-            "tailList-cpu-arguments": 41182,
-            "tailList-memory-arguments": 32,
-            "trace-cpu-arguments": 212342,
-            "trace-memory-arguments": 32,
-            "unBData-cpu-arguments": 31220,
-            "unBData-memory-arguments": 32,
-            "unConstrData-cpu-arguments": 32696,
-            "unConstrData-memory-arguments": 32,
-            "unIData-cpu-arguments": 43357,
-            "unIData-memory-arguments": 32,
-            "unListData-cpu-arguments": 32247,
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+  },
+  "maxCollateralInputs": 3,
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+  },
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 }
diff --git a/cardano_node_tests/cluster_scripts/mainnet_fast/genesis.alonzo.spec.json b/cardano_node_tests/cluster_scripts/mainnet_fast/genesis.alonzo.spec.json
index 3970561a6..abcaab932 100644
--- a/cardano_node_tests/cluster_scripts/mainnet_fast/genesis.alonzo.spec.json
+++ b/cardano_node_tests/cluster_scripts/mainnet_fast/genesis.alonzo.spec.json
@@ -1,371 +1,365 @@
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