diff --git a/.github/workflows/_build-binaries.yaml b/.github/workflows/_build-binaries.yaml
index 89fb73dd..61a8074c 100644
--- a/.github/workflows/_build-binaries.yaml
+++ b/.github/workflows/_build-binaries.yaml
@@ -117,6 +117,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Cache geth binary
         uses: actions/cache@2f8e54208210a422b2efd51efaa6bd6d7ca8920f # v3.4.3
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 560ad890..77c555f6 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -27,6 +27,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Install project dependencies
         run: |
@@ -35,7 +37,7 @@ jobs:
       - name: Lint Go
         uses: golangci/golangci-lint-action@1481404843c368bc19ca9406f87d6e0fc97bdcfd # v7.0.0
         with:
-          version: v2.0
+          version: v2.13.2
 
   go-test:
     outputs:
@@ -53,6 +55,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Install project dependencies
         run: |
@@ -89,6 +93,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Install project dependencies
         run: |
diff --git a/.github/workflows/examples.yaml b/.github/workflows/examples.yaml
index 21823488..dc7702dd 100644
--- a/.github/workflows/examples.yaml
+++ b/.github/workflows/examples.yaml
@@ -37,6 +37,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Install project dependencies
         run: |
diff --git a/.github/workflows/public-benchmarks.yaml b/.github/workflows/public-benchmarks.yaml
index 4038cfc3..7333f8ca 100644
--- a/.github/workflows/public-benchmarks.yaml
+++ b/.github/workflows/public-benchmarks.yaml
@@ -38,6 +38,8 @@ jobs:
 
       - name: Set up Go
         uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version-file: go.mod
 
       - name: Install project dependencies
         run: |
diff --git a/go.mod b/go.mod
index c5dd0a7b..652a9268 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,6 @@
 module github.com/base/base-bench
 
-go 1.24.6
-
-toolchain go1.24.11
+go 1.27.1
 
 require (
 	github.com/charmbracelet/huh v0.8.0
diff --git a/runner/payload/loadtest/load_test_worker.go b/runner/payload/loadtest/load_test_worker.go
index 54d94e9b..49413c97 100644
--- a/runner/payload/loadtest/load_test_worker.go
+++ b/runner/payload/loadtest/load_test_worker.go
@@ -17,6 +17,7 @@ import (
 	"github.com/base/base-bench/runner/network/mempool"
 	"github.com/base/base-bench/runner/network/types"
 	"github.com/base/base-bench/runner/payload/worker"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/pkg/errors"
 	"gopkg.in/yaml.v3"
@@ -76,7 +77,7 @@ func NewLoadTestPayloadWorker(
 
 	w := &loadTestPayloadWorker{
 		log:              log,
-		prefundSK:        hex.EncodeToString(prefundedPrivateKey.D.Bytes()),
+		prefundSK:        hex.EncodeToString(crypto.FromECDSA(&prefundedPrivateKey)),
 		loadTestBin:      cfg.LoadTestBinary(),
 		elRPCURL:         elRPCURL,
 		flashblocksURL:   flashblocksURL,
diff --git a/runner/payload/simulator/simulatorstats/types.go b/runner/payload/simulator/simulatorstats/types.go
index 0285b908..8ba1ed5b 100644
--- a/runner/payload/simulator/simulatorstats/types.go
+++ b/runner/payload/simulator/simulatorstats/types.go
@@ -69,7 +69,7 @@ func (o OpcodeStats) String() string {
 	})
 	opcodes = opcodes[:min(10, len(opcodes))]
 	for _, opcode := range opcodes {
-		result.WriteString(fmt.Sprintf("\n   - %20s: %.2f", opcode, o[opcode]))
+		fmt.Fprintf(&result, "\n   - %20s: %.2f", opcode, o[opcode])
 	}
 	return result.String()
 }
diff --git a/runner/payload/simulator/worker.go b/runner/payload/simulator/worker.go
index 1a228c7a..3dc4b084 100644
--- a/runner/payload/simulator/worker.go
+++ b/runner/payload/simulator/worker.go
@@ -3,6 +3,7 @@ package simulator
 import (
 	"context"
 	"crypto/ecdsa"
+	"encoding/binary"
 	"fmt"
 	"math"
 	"math/big"
@@ -217,7 +218,8 @@ func generateCallerAccounts(prefundedKey *ecdsa.PrivateKey, numCallers int) ([]*
 	}
 
 	// Use deterministic random source seeded from prefunded key
-	seed := int64(prefundedKey.D.Uint64())
+	keyBytes := crypto.FromECDSA(prefundedKey)
+	seed := int64(binary.BigEndian.Uint64(keyBytes[len(keyBytes)-8:]))
 	src := rand.New(rand.NewSource(seed))
 
 	keys := make([]*ecdsa.PrivateKey, numCallers)
diff --git a/runner/payload/txfuzz/tx_fuzz_worker.go b/runner/payload/txfuzz/tx_fuzz_worker.go
index 87fd5010..6274c0af 100644
--- a/runner/payload/txfuzz/tx_fuzz_worker.go
+++ b/runner/payload/txfuzz/tx_fuzz_worker.go
@@ -13,6 +13,7 @@ import (
 	"github.com/base/base-bench/runner/network/mempool"
 	"github.com/base/base-bench/runner/network/types"
 	"github.com/base/base-bench/runner/payload/worker"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/pkg/errors"
 )
@@ -43,7 +44,7 @@ func NewTxFuzzPayloadWorker(
 
 	t := &txFuzzPayloadWorker{
 		log:         log,
-		prefundSK:   hex.EncodeToString(prefundedPrivateKey.D.Bytes()),
+		prefundSK:   hex.EncodeToString(crypto.FromECDSA(&prefundedPrivateKey)),
 		txFuzzBin:   cfg.TxFuzzBinary(),
 		elRPCURL:    elRPCURL,
 		mempool:     mempool,