diff --git a/go.mod b/go.mod
index 94363fc..1779cfb 100644
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,8 @@
 module github.com/vmihailenco/msgpack/v5
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/kr/pretty v0.1.0 // indirect
 	github.com/stretchr/testify v1.6.1
 	github.com/vmihailenco/tagparser v0.1.2
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127
 )
 
 go 1.11
diff --git a/go.sum b/go.sum
index a21ed8d..309f684 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,5 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -13,8 +7,7 @@ github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/vmihailenco/tagparser v0.1.2 h1:gnjoVuB/kljJ5wICEEOpx98oXMWPLj22G67Vbd1qPqc=
 github.com/vmihailenco/tagparser v0.1.2/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/msgpack_test.go b/msgpack_test.go
index b9442a0..66ce312 100644
--- a/msgpack_test.go
+++ b/msgpack_test.go
@@ -3,14 +3,14 @@ package msgpack_test
 import (
 	"bufio"
 	"bytes"
+	"fmt"
 	"math"
 	"reflect"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/require"
-	. "gopkg.in/check.v1"
-
+	"github.com/stretchr/testify/suite"
 	"github.com/vmihailenco/msgpack/v5"
 )
 
@@ -18,69 +18,69 @@ type nameStruct struct {
 	Name string
 }
 
-func TestGocheck(t *testing.T) { TestingT(t) }
-
 type MsgpackTest struct {
+	suite.Suite
+
 	buf *bytes.Buffer
 	enc *msgpack.Encoder
 	dec *msgpack.Decoder
 }
 
-var _ = Suite(&MsgpackTest{})
-
-func (t *MsgpackTest) SetUpTest(c *C) {
+func (t *MsgpackTest) SetUpTest() {
 	t.buf = &bytes.Buffer{}
 	t.enc = msgpack.NewEncoder(t.buf)
 	t.dec = msgpack.NewDecoder(bufio.NewReader(t.buf))
 }
 
-func (t *MsgpackTest) TestDecodeNil(c *C) {
-	c.Assert(t.dec.Decode(nil), NotNil)
+func (t *MsgpackTest) TestDecodeNil() {
+	t.NotNil(t.dec.Decode(nil))
 }
 
-func (t *MsgpackTest) TestTime(c *C) {
+func (t *MsgpackTest) TestTime() {
 	in := time.Now()
 	var out time.Time
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Equal(in), Equals, true)
+
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.True(out.Equal(in))
 
 	var zero time.Time
-	c.Assert(t.enc.Encode(zero), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Equal(zero), Equals, true)
-	c.Assert(out.IsZero(), Equals, true)
+	t.Nil(t.enc.Encode(zero))
+	t.Nil(t.dec.Decode(&out))
+	t.True(out.Equal(zero))
+	t.True(out.IsZero())
+
 }
 
-func (t *MsgpackTest) TestLargeBytes(c *C) {
+func (t *MsgpackTest) TestLargeBytes() {
 	N := int(1e6)
 
 	src := bytes.Repeat([]byte{'1'}, N)
-	c.Assert(t.enc.Encode(src), IsNil)
+	t.Nil(t.enc.Encode(src))
 	var dst []byte
-	c.Assert(t.dec.Decode(&dst), IsNil)
-	c.Assert(dst, DeepEquals, src)
+	t.Nil(t.dec.Decode(&dst))
+	t.Equal(dst, src)
 }
 
-func (t *MsgpackTest) TestLargeString(c *C) {
+func (t *MsgpackTest) TestLargeString() {
 	N := int(1e6)
 
 	src := string(bytes.Repeat([]byte{'1'}, N))
-	c.Assert(t.enc.Encode(src), IsNil)
+	t.Nil(t.enc.Encode(src))
 	var dst string
-	c.Assert(t.dec.Decode(&dst), IsNil)
-	c.Assert(dst, Equals, src)
+	t.Nil(t.dec.Decode(&dst))
+	t.Equal(dst, src)
 }
 
-func (t *MsgpackTest) TestSliceOfStructs(c *C) {
-	in := []*nameStruct{&nameStruct{"hello"}}
+func (t *MsgpackTest) TestSliceOfStructs() {
+	in := []*nameStruct{{"hello"}}
 	var out []*nameStruct
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out, DeepEquals, in)
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out, in)
 }
 
-func (t *MsgpackTest) TestMap(c *C) {
+func (t *MsgpackTest) TestMap() {
 	for _, i := range []struct {
 		m map[string]string
 		b []byte
@@ -88,24 +88,24 @@ func (t *MsgpackTest) TestMap(c *C) {
 		{map[string]string{}, []byte{0x80}},
 		{map[string]string{"hello": "world"}, []byte{0x81, 0xa5, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0xa5, 0x77, 0x6f, 0x72, 0x6c, 0x64}},
 	} {
-		c.Assert(t.enc.Encode(i.m), IsNil)
-		c.Assert(t.buf.Bytes(), DeepEquals, i.b, Commentf("err encoding %v", i.m))
+		t.Nil(t.enc.Encode(i.m))
+		t.Equal(t.buf.Bytes(), i.b, fmt.Errorf("err encoding %v", i.m))
 		var m map[string]string
-		c.Assert(t.dec.Decode(&m), IsNil)
-		c.Assert(m, DeepEquals, i.m)
+		t.Nil(t.dec.Decode(&m))
+		t.Equal(m, i.m)
 	}
 }
 
-func (t *MsgpackTest) TestStructNil(c *C) {
+func (t *MsgpackTest) TestStructNil() {
 	var dst *nameStruct
 
-	c.Assert(t.enc.Encode(nameStruct{Name: "foo"}), IsNil)
-	c.Assert(t.dec.Decode(&dst), IsNil)
-	c.Assert(dst, Not(IsNil))
-	c.Assert(dst.Name, Equals, "foo")
+	t.Nil(t.enc.Encode(nameStruct{Name: "foo"}))
+	t.Nil(t.dec.Decode(&dst))
+	t.NotNil(dst)
+	t.Equal(dst.Name, "foo")
 }
 
-func (t *MsgpackTest) TestStructUnknownField(c *C) {
+func (t *MsgpackTest) TestStructUnknownField() {
 	in := struct {
 		Field1 string
 		Field2 string
@@ -115,13 +115,13 @@ func (t *MsgpackTest) TestStructUnknownField(c *C) {
 		Field2: "value2",
 		Field3: "value3",
 	}
-	c.Assert(t.enc.Encode(in), IsNil)
+	t.Nil(t.enc.Encode(in))
 
 	out := struct {
 		Field2 string
 	}{}
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Field2, Equals, "value2")
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out.Field2, "value2")
 }
 
 //------------------------------------------------------------------------------
@@ -151,45 +151,45 @@ func (s *coderStruct) DecodeMsgpack(dec *msgpack.Decoder) error {
 	return dec.Decode(&s.name)
 }
 
-func (t *MsgpackTest) TestCoder(c *C) {
+func (t *MsgpackTest) TestCoder() {
 	in := &coderStruct{name: "hello"}
 	var out coderStruct
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Name(), Equals, "hello")
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out.Name(), "hello")
 }
 
-func (t *MsgpackTest) TestNilCoder(c *C) {
+func (t *MsgpackTest) TestNilCoder() {
 	in := &coderStruct{name: "hello"}
 	var out *coderStruct
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Name(), Equals, "hello")
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out.Name(), "hello")
 }
 
-func (t *MsgpackTest) TestNilCoderValue(c *C) {
+func (t *MsgpackTest) TestNilCoderValue() {
 	in := &coderStruct{name: "hello"}
 	var out *coderStruct
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.DecodeValue(reflect.ValueOf(&out)), IsNil)
-	c.Assert(out.Name(), Equals, "hello")
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.DecodeValue(reflect.ValueOf(&out)))
+	t.Equal(out.Name(), "hello")
 }
 
-func (t *MsgpackTest) TestPtrToCoder(c *C) {
+func (t *MsgpackTest) TestPtrToCoder() {
 	in := &coderStruct{name: "hello"}
 	var out coderStruct
 	out2 := &out
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out2), IsNil)
-	c.Assert(out.Name(), Equals, "hello")
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out2))
+	t.Equal(out.Name(), "hello")
 }
 
-func (t *MsgpackTest) TestWrappedCoder(c *C) {
+func (t *MsgpackTest) TestWrappedCoder() {
 	in := &wrapperStruct{coderStruct: coderStruct{name: "hello"}}
 	var out wrapperStruct
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Name(), Equals, "hello")
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out.Name(), "hello")
 }
 
 //------------------------------------------------------------------------------
@@ -203,13 +203,13 @@ type struct1 struct {
 	Struct2 struct2
 }
 
-func (t *MsgpackTest) TestNestedStructs(c *C) {
+func (t *MsgpackTest) TestNestedStructs() {
 	in := &struct1{Name: "hello", Struct2: struct2{Name: "world"}}
 	var out struct1
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out.Name, Equals, in.Name)
-	c.Assert(out.Struct2.Name, Equals, in.Struct2.Name)
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out.Name, in.Name)
+	t.Equal(out.Struct2.Name, in.Struct2.Name)
 }
 
 type Struct4 struct {
@@ -247,13 +247,13 @@ func TestEmbedding(t *testing.T) {
 	}
 }
 
-func (t *MsgpackTest) TestSliceNil(c *C) {
+func (t *MsgpackTest) TestSliceNil() {
 	in := [][]*int{nil}
 	var out [][]*int
 
-	c.Assert(t.enc.Encode(in), IsNil)
-	c.Assert(t.dec.Decode(&out), IsNil)
-	c.Assert(out, DeepEquals, in)
+	t.Nil(t.enc.Encode(in))
+	t.Nil(t.dec.Decode(&out))
+	t.Equal(out, in)
 }
 
 //------------------------------------------------------------------------------