diff --git a/Makefile b/Makefile
index 96f15c20ce..b828b6c19c 100644
--- a/Makefile
+++ b/Makefile
@@ -346,10 +346,9 @@ contracts/test/prover/proofs/%.json: $(arbitrator_cases)/%.wasm $(arbitrator_pro
 	test -f target/lib-wasm/libbrotlidec-static.a || ./scripts/build-brotli.sh -w -d
 	@touch $@
 
-.make/wasm-lib: $(DEP_PREDICATE) $(ORDER_ONLY_PREDICATE) .make
+.make/wasm-lib: $(DEP_PREDICATE) arbitrator/wasm-libraries/soft-float/SoftFloat/build/Wasm-Clang/softfloat.a  $(ORDER_ONLY_PREDICATE) .make
 	test -f arbitrator/wasm-libraries/soft-float/bindings32.o || ./scripts/build-brotli.sh -f -d -t .
 	test -f arbitrator/wasm-libraries/soft-float/bindings64.o || ./scripts/build-brotli.sh -f -d -t .
-	test -f arbitrator/wasm-libraries/soft-float/SoftFloat/build/Wasm-Clang/softfloat.a || ./scripts/build-brotli.sh -f -d -t .
 	@touch $@
 
 .make:
diff --git a/arbos/arbosState/arbosstate.go b/arbos/arbosState/arbosstate.go
index 2bea8f7c54..4891197a10 100644
--- a/arbos/arbosState/arbosstate.go
+++ b/arbos/arbosState/arbosstate.go
@@ -303,7 +303,16 @@ func (state *ArbosState) UpgradeArbosVersion(
 					ErrFatalNodeOutOfDate,
 				)
 			}
-			// no state changes needed
+			// Update the PerBatchGasCost to a more accurate value compared to the old v6 default.
+			ensure(state.l1PricingState.SetPerBatchGasCost(l1pricing.InitialPerBatchGasCostV12))
+
+			// We had mistakenly initialized AmortizedCostCapBips to math.MaxUint64 in older versions,
+			// but the correct value to disable the amortization cap is 0.
+			oldAmortizationCap, err := state.l1PricingState.AmortizedCostCapBips()
+			ensure(err)
+			if oldAmortizationCap == math.MaxUint64 {
+				ensure(state.l1PricingState.SetAmortizedCostCapBips(0))
+			}
 		default:
 			return fmt.Errorf(
 				"the chain is upgrading to unsupported ArbOS version %v, %w",
@@ -315,7 +324,9 @@ func (state *ArbosState) UpgradeArbosVersion(
 	}
 
 	if firstTime && upgradeTo >= 6 {
-		state.Restrict(state.l1PricingState.SetPerBatchGasCost(l1pricing.InitialPerBatchGasCostV6))
+		if upgradeTo < 11 {
+			state.Restrict(state.l1PricingState.SetPerBatchGasCost(l1pricing.InitialPerBatchGasCostV6))
+		}
 		state.Restrict(state.l1PricingState.SetEquilibrationUnits(l1pricing.InitialEquilibrationUnitsV6))
 		state.Restrict(state.l2PricingState.SetSpeedLimitPerSecond(l2pricing.InitialSpeedLimitPerSecondV6))
 		state.Restrict(state.l2PricingState.SetMaxPerBlockGasLimit(l2pricing.InitialPerBlockGasLimitV6))
diff --git a/arbos/l1pricing/l1pricing.go b/arbos/l1pricing/l1pricing.go
index 9772ac028b..a924cbf724 100644
--- a/arbos/l1pricing/l1pricing.go
+++ b/arbos/l1pricing/l1pricing.go
@@ -72,9 +72,10 @@ const (
 )
 
 const (
-	InitialInertia           = 10
-	InitialPerUnitReward     = 10
-	InitialPerBatchGasCostV6 = 100000
+	InitialInertia            = 10
+	InitialPerUnitReward      = 10
+	InitialPerBatchGasCostV6  = 100_000
+	InitialPerBatchGasCostV12 = 210_000 // overriden as part of the upgrade
 )
 
 // one minute at 100000 bytes / sec
diff --git a/precompiles/ArbOwner_test.go b/precompiles/ArbOwner_test.go
index b5527e0017..ab128a8cb2 100644
--- a/precompiles/ArbOwner_test.go
+++ b/precompiles/ArbOwner_test.go
@@ -9,20 +9,17 @@ import (
 	"math/big"
 	"testing"
 
-	"github.com/offchainlabs/nitro/arbos/l1pricing"
-
-	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
 
 	"github.com/offchainlabs/nitro/arbos/arbosState"
 	"github.com/offchainlabs/nitro/arbos/burn"
-	"github.com/offchainlabs/nitro/util/testhelpers"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/offchainlabs/nitro/arbos/l1pricing"
 	"github.com/offchainlabs/nitro/arbos/util"
+	"github.com/offchainlabs/nitro/util/testhelpers"
 )
 
 func TestArbOwner(t *testing.T) {
@@ -99,7 +96,7 @@ func TestArbOwner(t *testing.T) {
 
 	costCap, err := gasInfo.GetAmortizedCostCapBips(callCtx, evm)
 	Require(t, err)
-	if costCap != math.MaxUint64 {
+	if costCap != 0 {
 		Fail(t, costCap)
 	}
 	newCostCap := uint64(77734)