diff --git a/go.mod b/go.mod
index eadbc9bc..7f7704ca 100644
--- a/go.mod
+++ b/go.mod
@@ -11,8 +11,8 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.22
 	github.com/shopspring/decimal v1.4.0
 	gitlab.com/NebulousLabs/encoding v0.0.0-20200604091946-456c3dc907fe
-	go.sia.tech/core v0.2.6
-	go.sia.tech/coreutils v0.0.5
+	go.sia.tech/core v0.2.7
+	go.sia.tech/coreutils v0.0.6
 	go.sia.tech/jape v0.11.2-0.20240306154058-9832414a5385
 	go.sia.tech/siad v1.5.10-0.20230228235644-3059c0b930ca
 	go.sia.tech/web/hostd v0.44.0
diff --git a/go.sum b/go.sum
index 49100939..8bfab76d 100644
--- a/go.sum
+++ b/go.sum
@@ -194,10 +194,10 @@ gitlab.com/NebulousLabs/writeaheadlog v0.0.0-20200618142844-c59a90f49130/go.mod
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/bbolt v1.3.10 h1:+BqfJTcCzTItrop8mq/lbzL8wSGtj94UO/3U31shqG0=
 go.etcd.io/bbolt v1.3.10/go.mod h1:bK3UQLPJZly7IlNmV7uVHJDxfe5aK9Ll93e/74Y9oEQ=
-go.sia.tech/core v0.2.6 h1:JrbZwW4cPHCB2Q6TeqCsAj2GAFXrRqLq0q/GNevtnPU=
-go.sia.tech/core v0.2.6/go.mod h1:B7ooFH3F6cLjxQz6IX33kgjOY392Ava7pzpPeccagac=
-go.sia.tech/coreutils v0.0.5 h1:Jj03VrqAayYHgA9fwV13+X88WB+Wr1p8wuLw2B8d2FI=
-go.sia.tech/coreutils v0.0.5/go.mod h1:SkSpHeq3tBh2ff4HXuBk2WtlhkYQQtdcvU4Yv1Rd2bU=
+go.sia.tech/core v0.2.7 h1:9Q/3BHL6ziAMPeiko863hhTD/Zs2s7OqEUiPKouDny8=
+go.sia.tech/core v0.2.7/go.mod h1:BMgT/reXtgv6XbDgUYTCPY7wSMbspDRDs7KMi1vL6Iw=
+go.sia.tech/coreutils v0.0.6 h1:xLpv3JyvbOoXcX3gC6a6Y3zQ/MZn/fyFvuPIzv/e/Eg=
+go.sia.tech/coreutils v0.0.6/go.mod h1:EiDcQk2qLuP32Qoj/XphY9fbjTXphJhJZMERoC4LF0c=
 go.sia.tech/jape v0.11.2-0.20240306154058-9832414a5385 h1:Gho1g6pkv56o6Ut9cez/Yu5o4xlA8WNkDbPn6RWXL7g=
 go.sia.tech/jape v0.11.2-0.20240306154058-9832414a5385/go.mod h1:wU+h6Wh5olDjkPXjF0tbZ1GDgoZ6VTi4naFw91yyWC4=
 go.sia.tech/mux v1.2.0 h1:ofa1Us9mdymBbGMY2XH/lSpY8itFsKIo/Aq8zwe+GHU=
diff --git a/persist/sqlite/contracts.go b/persist/sqlite/contracts.go
index 4c34b37f..322597e0 100644
--- a/persist/sqlite/contracts.go
+++ b/persist/sqlite/contracts.go
@@ -988,20 +988,14 @@ func decodeRevision(b []byte, fcr *types.FileContractRevision) error {
 func encodeTxnSet(txns []types.Transaction) []byte {
 	var buf bytes.Buffer
 	e := types.NewEncoder(&buf)
-	e.WritePrefix(len(txns))
-	for i := range txns {
-		txns[i].EncodeTo(e)
-	}
+	types.EncodeSlice(e, txns)
 	e.Flush()
 	return buf.Bytes()
 }
 
 func decodeTxnSet(b []byte, txns *[]types.Transaction) error {
 	d := types.NewBufDecoder(b)
-	*txns = make([]types.Transaction, d.ReadPrefix())
-	for i := range *txns {
-		(*txns)[i].DecodeFrom(d)
-	}
+	types.DecodeSlice(d, txns)
 	return d.Err()
 }
 
diff --git a/rhp/v3/execute.go b/rhp/v3/execute.go
index 0cc8e070..3bc0526b 100644
--- a/rhp/v3/execute.go
+++ b/rhp/v3/execute.go
@@ -323,10 +323,9 @@ func (pe *programExecutor) executeSwapSector(instr *rhp3.InstrSwapSector, log *z
 		// encode the old leaf hashes
 		var buf bytes.Buffer
 		enc := types.NewEncoder(&buf)
-		enc.WritePrefix(len(oldLeafHashes))
-		for _, h := range oldLeafHashes {
+		types.EncodeSliceFn(enc, oldLeafHashes, func(enc *types.Encoder, h types.Hash256) {
 			enc.Write(h[:])
-		}
+		})
 		if err := enc.Flush(); err != nil {
 			return nil, nil, fmt.Errorf("failed to encode old leaf hashes: %w", err)
 		}