diff --git a/go.mod b/go.mod
index c96dfbe..ff5883a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/alecthomas/go_serialization_benchmarks
 
-go 1.21.4
+go 1.22.4
 
 require (
 	github.com/200sc/bebop v0.5.0
@@ -34,6 +34,8 @@ require (
 	wellquite.org/bebop v0.0.0-20231109192402-a92af83691ec
 )
 
+require github.com/nazarifard/copi v0.0.0-20240609072615-763316f77579 // indirect
+
 require (
 	github.com/DataDog/zstd v1.5.2 // indirect
 	github.com/cosmos/cosmos-proto v1.0.0-beta.3
diff --git a/go.sum b/go.sum
index 5eb7471..7964b92 100644
--- a/go.sum
+++ b/go.sum
@@ -203,6 +203,8 @@ github.com/mus-format/mus-common-go v0.0.0-20230426111652-d1324c6517b3/go.mod h1
 github.com/mus-format/mus-go v0.0.0-20230426134740-6572513fca3d h1:/FqtbOoougvCbsp769ZZxgN3Pj/fepBAr4ETQXM+uwQ=
 github.com/mus-format/mus-go v0.0.0-20230426134740-6572513fca3d/go.mod h1:zdDnTFri6XqdQVRTE/HuGnmn+/3c3a0ODNUsw+9SXS8=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/nazarifard/copi v0.0.0-20240609072615-763316f77579 h1:toqD8/J9DygfET+HZRsIu4kLUz32E4qcUhR1USRNPrY=
+github.com/nazarifard/copi v0.0.0-20240609072615-763316f77579/go.mod h1:RZX6PlUi+vF52MjBneuJcoszjuejOPWdMnAKaJOccGc=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
 github.com/neelance/sourcemap v0.0.0-20200213170602-2833bce08e4c/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM=
 github.com/niubaoshu/goutils v0.0.0-20180828035119-e8e576f66c2b h1:T7vmCmpGIvqlOOp5SXatALP+HYc/40ZHbxmgy+p+sN0=
diff --git a/internal/serializers/copi/copi.go b/internal/serializers/copi/copi.go
new file mode 100644
index 0000000..de8417c
--- /dev/null
+++ b/internal/serializers/copi/copi.go
@@ -0,0 +1,91 @@
+package copi
+
+import (
+	"github.com/alecthomas/go_serialization_benchmarks/goserbench"
+	"github.com/nazarifard/copi"
+)
+
+type smallStructCp struct {
+	NameCp     copi.StringCp
+	BirthDayCp copi.TimeCp
+	PhoneCp    copi.StringCp
+	SiblingsCp copi.UnitCp[int]
+	SpouseCp   copi.UnitCp[bool]
+	MoneyCp    copi.UnitCp[float64]
+}
+
+func (cp smallStructCp) SizeOf(p goserbench.SmallStruct) int {
+	return cp.NameCp.SizeOf(p.Name) +
+		cp.BirthDayCp.SizeOf(p.BirthDay) +
+		cp.PhoneCp.SizeOf(p.Phone) +
+		cp.SiblingsCp.SizeOf(p.Siblings) +
+		cp.SpouseCp.SizeOf(p.Spouse) +
+		cp.MoneyCp.SizeOf(p.Money)
+}
+
+func (cp smallStructCp) Marshal(o interface{}) (buf []byte, err error) {
+	p := o.(*goserbench.SmallStruct)
+	buf = make([]byte, cp.SizeOf(*p))
+
+	k, n := 0, 0
+	k, _ = cp.NameCp.Marshal(p.Name, buf[n:])
+	n += k
+	k, _ = cp.BirthDayCp.Marshal(p.BirthDay, buf[n:])
+	n += k
+	k, _ = cp.PhoneCp.Marshal(p.Phone, buf[n:])
+	n += k
+	k, _ = cp.SiblingsCp.Marshal(p.Siblings, buf[n:])
+	n += k
+	k, _ = cp.SpouseCp.Marshal(p.Spouse, buf[n:])
+	n += k
+	k, _ = cp.MoneyCp.Marshal(p.Money, buf[n:])
+	n += k
+	return
+}
+
+func (cp smallStructCp) Unmarshal(bs []byte, o interface{}) (err error) {
+	p := o.(*goserbench.SmallStruct)
+
+	k, n := 0, 0
+	k, err = cp.NameCp.Unmarshal(bs[n:], &p.Name)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	k, err = cp.BirthDayCp.Unmarshal(bs[n:], &p.BirthDay)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	k, err = cp.PhoneCp.Unmarshal(bs[n:], &p.Phone)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	k, err = cp.SiblingsCp.Unmarshal(bs[n:], &p.Siblings)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	k, err = cp.SpouseCp.Unmarshal(bs[n:], &p.Spouse)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	k, err = cp.MoneyCp.Unmarshal(bs[n:], &p.Money)
+	n += k
+	if err != nil {
+		return err
+	}
+
+	return
+}
+
+func NewCopiSerializer() goserbench.Serializer {
+	return smallStructCp{}
+}
diff --git a/serialization_benchmarks_test.go b/serialization_benchmarks_test.go
index f32a709..a022b92 100644
--- a/serialization_benchmarks_test.go
+++ b/serialization_benchmarks_test.go
@@ -15,6 +15,7 @@ import (
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/bson"
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/capnproto"
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/colfer"
+	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/copi"
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/easyjson"
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/fastjson"
 	"github.com/alecthomas/go_serialization_benchmarks/internal/serializers/flatbuffers"
@@ -231,6 +232,10 @@ var benchmarkCases = []BenchmarkCase{
 		Name: "baseline",
 		URL:  "",
 		New:  baseline.NewBaselineSerializer,
+	}, {
+		Name: "copi",
+		URL:  "github.com/nazarifard/copi",
+		New:  copi.NewCopiSerializer,
 	},
 }