diff --git a/arrayiter/arrayiter.go b/arrayiter/arrayiter.go
index 435cfa7..b531e76 100644
--- a/arrayiter/arrayiter.go
+++ b/arrayiter/arrayiter.go
@@ -2,10 +2,9 @@ package arrayiter
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"sync"
-
-	"github.com/pkg/errors"
 )
 
 func Iterate(ctx context.Context, a interface{}) (Iterator, error) {
@@ -14,7 +13,7 @@ func Iterate(ctx context.Context, a interface{}) (Iterator, error) {
 	switch arv.Kind() {
 	case reflect.Array, reflect.Slice:
 	default:
-		return nil, errors.Errorf(`argument must be an array/slice (%s)`, arv.Type())
+		return nil, fmt.Errorf(`argument must be an array/slice (%s)`, arv.Type())
 	}
 
 	ch := make(chan *Pair)
@@ -119,7 +118,7 @@ func Walk(ctx context.Context, s Source, v Visitor) error {
 	for i := s.Iterate(ctx); i.Next(ctx); {
 		pair := i.Pair()
 		if err := v.Visit(pair.Index, pair.Value); err != nil {
-			return errors.Wrapf(err, `failed to visit index %d`, pair.Index)
+			return fmt.Errorf(`failed to visit index %d: %w`, pair.Index, err)
 		}
 	}
 	return nil
@@ -131,13 +130,13 @@ func AsArray(ctx context.Context, s interface{}, v interface{}) error {
 	case reflect.Array, reflect.Slice:
 		x, err := Iterate(ctx, s)
 		if err != nil {
-			return errors.Wrap(err, `failed to iterate over array/slice type`)
+			return fmt.Errorf(`failed to iterate over array/slice type: %w`, err)
 		}
 		iter = x
 	default:
 		ssrc, ok := s.(Source)
 		if !ok {
-			return errors.Errorf(`cannot iterate over %T: not a arrayiter.Source type`, s)
+			return fmt.Errorf(`cannot iterate over %T: not a arrayiter.Source type`, s)
 		}
 		iter = ssrc.Iterate(ctx)
 	}
@@ -146,14 +145,14 @@ func AsArray(ctx context.Context, s interface{}, v interface{}) error {
 
 	// dst MUST be a pointer to a array type
 	if kind := dst.Kind(); kind != reflect.Ptr {
-		return errors.Errorf(`dst must be a pointer to a array (%s)`, dst.Type())
+		return fmt.Errorf(`dst must be a pointer to a array (%s)`, dst.Type())
 	}
 
 	dst = dst.Elem()
 	switch dst.Kind() {
 	case reflect.Array, reflect.Slice:
 	default:
-		return errors.Errorf(`dst must be a pointer to an array or slice (%s)`, dst.Type())
+		return fmt.Errorf(`dst must be a pointer to an array or slice (%s)`, dst.Type())
 	}
 
 	var pairs []*Pair
@@ -165,7 +164,7 @@ func AsArray(ctx context.Context, s interface{}, v interface{}) error {
 	switch dst.Kind() {
 	case reflect.Array:
 		if len(pairs) < dst.Len() {
-			return errors.Errorf(`dst array does not have enough space for elements (%d, want %d)`, dst.Len(), len(pairs))
+			return fmt.Errorf(`dst array does not have enough space for elements (%d, want %d)`, dst.Len(), len(pairs))
 		}
 	case reflect.Slice:
 		if dst.IsNil() {
@@ -175,7 +174,7 @@ func AsArray(ctx context.Context, s interface{}, v interface{}) error {
 
 	// dst must be assignable
 	if !dst.CanSet() {
-		return errors.New(`dst is not writeable`)
+		return fmt.Errorf(`dst is not writeable`)
 	}
 
 	elemtyp := dst.Type().Elem()
@@ -183,7 +182,7 @@ func AsArray(ctx context.Context, s interface{}, v interface{}) error {
 		rvvalue := reflect.ValueOf(pair.Value)
 
 		if !rvvalue.Type().AssignableTo(elemtyp) {
-			return errors.Errorf(`cannot assign key of type %s to map key of type %s`, rvvalue.Type(), elemtyp)
+			return fmt.Errorf(`cannot assign key of type %s to map key of type %s`, rvvalue.Type(), elemtyp)
 		}
 
 		dst.Index(pair.Index).Set(rvvalue)
diff --git a/go.mod b/go.mod
index 7cdb686..48a5f71 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,4 @@ module github.com/lestrrat-go/iter
 
 go 1.13
 
-require (
-	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.5.1
-)
+require github.com/stretchr/testify v1.5.1
diff --git a/go.sum b/go.sum
index 4516e6a..331fa69 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +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/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 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=
diff --git a/mapiter/mapiter.go b/mapiter/mapiter.go
index 331a978..ec33285 100644
--- a/mapiter/mapiter.go
+++ b/mapiter/mapiter.go
@@ -2,10 +2,9 @@ package mapiter
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"sync"
-
-	"github.com/pkg/errors"
 )
 
 // Iterate creates an iterator from arbitrary map types. This is not
@@ -17,7 +16,7 @@ func Iterate(ctx context.Context, m interface{}) (Iterator, error) {
 	mrv := reflect.ValueOf(m)
 
 	if mrv.Kind() != reflect.Map {
-		return nil, errors.Errorf(`argument must be a map (%s)`, mrv.Type())
+		return nil, fmt.Errorf(`argument must be a map (%s)`, mrv.Type())
 	}
 
 	ch := make(chan *Pair)
@@ -121,7 +120,7 @@ func Walk(ctx context.Context, s Source, v Visitor) error {
 	for i := s.Iterate(ctx); i.Next(ctx); {
 		pair := i.Pair()
 		if err := v.Visit(pair.Key, pair.Value); err != nil {
-			return errors.Wrapf(err, `failed to visit key %s`, pair.Key)
+			return fmt.Errorf(`failed to visit key %s: %w`, pair.Key, err)
 		}
 	}
 	return nil
@@ -134,13 +133,13 @@ func AsMap(ctx context.Context, s interface{}, v interface{}) error {
 	case reflect.Map:
 		x, err := Iterate(ctx, s)
 		if err != nil {
-			return errors.Wrap(err, `failed to iterate over map type`)
+			return fmt.Errorf(`failed to iterate over map type: %w`, err)
 		}
 		iter = x
 	default:
 		ssrc, ok := s.(Source)
 		if !ok {
-			return errors.Errorf(`cannot iterate over %T: not a mapiter.Source type`, s)
+			return fmt.Errorf(`cannot iterate over %T: not a mapiter.Source type`, s)
 		}
 		iter = ssrc.Iterate(ctx)
 	}
@@ -149,12 +148,12 @@ func AsMap(ctx context.Context, s interface{}, v interface{}) error {
 
 	// dst MUST be a pointer to a map type
 	if kind := dst.Kind(); kind != reflect.Ptr {
-		return errors.Errorf(`dst must be a pointer to a map (%s)`, dst.Type())
+		return fmt.Errorf(`dst must be a pointer to a map (%s)`, dst.Type())
 	}
 
 	dst = dst.Elem()
 	if dst.Kind() != reflect.Map {
-		return errors.Errorf(`dst must be a pointer to a map (%s)`, dst.Type())
+		return fmt.Errorf(`dst must be a pointer to a map (%s)`, dst.Type())
 	}
 
 	if dst.IsNil() {
@@ -163,7 +162,7 @@ func AsMap(ctx context.Context, s interface{}, v interface{}) error {
 
 	// dst must be assignable
 	if !dst.CanSet() {
-		return errors.New(`dst is not writeable`)
+		return fmt.Errorf(`dst is not writeable`)
 	}
 
 	keytyp := dst.Type().Key()
@@ -176,7 +175,7 @@ func AsMap(ctx context.Context, s interface{}, v interface{}) error {
 		rvvalue := reflect.ValueOf(pair.Value)
 
 		if !rvkey.Type().AssignableTo(keytyp) {
-			return errors.Errorf(`cannot assign key of type %s to map key of type %s`, rvkey.Type(), keytyp)
+			return fmt.Errorf(`cannot assign key of type %s to map key of type %s`, rvkey.Type(), keytyp)
 		}
 
 		switch rvvalue.Kind() {
@@ -185,7 +184,7 @@ func AsMap(ctx context.Context, s interface{}, v interface{}) error {
 			rvvalue = reflect.New(valtyp).Elem()
 		default:
 			if !rvvalue.Type().AssignableTo(valtyp) {
-				return errors.Errorf(`cannot assign value of type %s to map value of type %s`, rvvalue.Type(), valtyp)
+				return fmt.Errorf(`cannot assign value of type %s to map value of type %s`, rvvalue.Type(), valtyp)
 			}
 		}