diff --git a/copy_from.go b/copy_from.go
index 8eb3c111..7d6a8813 100644
--- a/copy_from.go
+++ b/copy_from.go
@@ -7,7 +7,7 @@ import (
 	"io"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 	"github.com/jackc/pgx/v5/pgconn"
 )
 
diff --git a/go.mod b/go.mod
index b467e7f4..79cbd50d 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module github.com/jackc/pgx/v5
 go 1.17
 
 require (
-	github.com/jackc/pgio v1.0.0
 	github.com/jackc/pgpassfile v1.0.0
 	github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b
 	github.com/jackc/puddle v1.2.1
diff --git a/go.sum b/go.sum
index 0931401b..a9851d43 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,6 @@
 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/jackc/pgio v1.0.0 h1:g12B9UwVnzGhueNavwioyEEpAmqMe1E/BN9ES+8ovkE=
-github.com/jackc/pgio v1.0.0/go.mod h1:oP+2QK2wFfUWgr+gxjoBH9KGBb31Eio69xUb0w5bYf8=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
 github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b h1:C8S2+VttkHFdOOCXJe+YGfa4vHYwlt4Zx+IVXQ97jYg=
diff --git a/pgio/README.md b/internal/pgio/README.md
similarity index 100%
rename from pgio/README.md
rename to internal/pgio/README.md
diff --git a/pgio/doc.go b/internal/pgio/doc.go
similarity index 100%
rename from pgio/doc.go
rename to internal/pgio/doc.go
diff --git a/pgio/write.go b/internal/pgio/write.go
similarity index 100%
rename from pgio/write.go
rename to internal/pgio/write.go
diff --git a/pgio/write_test.go b/internal/pgio/write_test.go
similarity index 100%
rename from pgio/write_test.go
rename to internal/pgio/write_test.go
diff --git a/pgconn/pgconn.go b/pgconn/pgconn.go
index 20dd6858..a9a6de8c 100644
--- a/pgconn/pgconn.go
+++ b/pgconn/pgconn.go
@@ -16,7 +16,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 	"github.com/jackc/pgx/v5/pgconn/internal/ctxwatch"
 	"github.com/jackc/pgx/v5/pgproto3"
 )
diff --git a/pgproto3/authentication_cleartext_password.go b/pgproto3/authentication_cleartext_password.go
index 241fa600..d8f98b9a 100644
--- a/pgproto3/authentication_cleartext_password.go
+++ b/pgproto3/authentication_cleartext_password.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationCleartextPassword is a message sent from the backend indicating that a clear-text password is required.
diff --git a/pgproto3/authentication_md5_password.go b/pgproto3/authentication_md5_password.go
index 32ec0390..5671c84c 100644
--- a/pgproto3/authentication_md5_password.go
+++ b/pgproto3/authentication_md5_password.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationMD5Password is a message sent from the backend indicating that an MD5 hashed password is required.
diff --git a/pgproto3/authentication_ok.go b/pgproto3/authentication_ok.go
index 2b476fe5..88d648ae 100644
--- a/pgproto3/authentication_ok.go
+++ b/pgproto3/authentication_ok.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationOk is a message sent from the backend indicating that authentication was successful.
diff --git a/pgproto3/authentication_sasl.go b/pgproto3/authentication_sasl.go
index bdcb2c36..996b97d3 100644
--- a/pgproto3/authentication_sasl.go
+++ b/pgproto3/authentication_sasl.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationSASL is a message sent from the backend indicating that SASL authentication is required.
diff --git a/pgproto3/authentication_sasl_continue.go b/pgproto3/authentication_sasl_continue.go
index 7f4a9c23..2ce70a47 100644
--- a/pgproto3/authentication_sasl_continue.go
+++ b/pgproto3/authentication_sasl_continue.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationSASLContinue is a message sent from the backend containing a SASL challenge.
diff --git a/pgproto3/authentication_sasl_final.go b/pgproto3/authentication_sasl_final.go
index d82b9ee4..a38a8b91 100644
--- a/pgproto3/authentication_sasl_final.go
+++ b/pgproto3/authentication_sasl_final.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // AuthenticationSASLFinal is a message sent from the backend indicating a SASL authentication has completed.
diff --git a/pgproto3/backend_key_data.go b/pgproto3/backend_key_data.go
index ca20dd25..12c60817 100644
--- a/pgproto3/backend_key_data.go
+++ b/pgproto3/backend_key_data.go
@@ -4,7 +4,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type BackendKeyData struct {
diff --git a/pgproto3/backend_test.go b/pgproto3/backend_test.go
index c3be614a..75755f22 100644
--- a/pgproto3/backend_test.go
+++ b/pgproto3/backend_test.go
@@ -4,7 +4,7 @@ import (
 	"io"
 	"testing"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 	"github.com/jackc/pgx/v5/pgproto3"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
diff --git a/pgproto3/bind.go b/pgproto3/bind.go
index e9664f59..fdd2d3b8 100644
--- a/pgproto3/bind.go
+++ b/pgproto3/bind.go
@@ -7,7 +7,7 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Bind struct {
diff --git a/pgproto3/cancel_request.go b/pgproto3/cancel_request.go
index 942e404b..8fcf8217 100644
--- a/pgproto3/cancel_request.go
+++ b/pgproto3/cancel_request.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const cancelRequestCode = 80877102
diff --git a/pgproto3/close.go b/pgproto3/close.go
index a45f2b93..f99b5943 100644
--- a/pgproto3/close.go
+++ b/pgproto3/close.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Close struct {
diff --git a/pgproto3/command_complete.go b/pgproto3/command_complete.go
index cdc49f39..a19b906c 100644
--- a/pgproto3/command_complete.go
+++ b/pgproto3/command_complete.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CommandComplete struct {
diff --git a/pgproto3/copy_both_response.go b/pgproto3/copy_both_response.go
index fbd985d8..3243dbc1 100644
--- a/pgproto3/copy_both_response.go
+++ b/pgproto3/copy_both_response.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CopyBothResponse struct {
diff --git a/pgproto3/copy_data.go b/pgproto3/copy_data.go
index 128aa198..59e3dd94 100644
--- a/pgproto3/copy_data.go
+++ b/pgproto3/copy_data.go
@@ -4,7 +4,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CopyData struct {
diff --git a/pgproto3/copy_fail.go b/pgproto3/copy_fail.go
index 78ff0b30..0041bbb1 100644
--- a/pgproto3/copy_fail.go
+++ b/pgproto3/copy_fail.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CopyFail struct {
diff --git a/pgproto3/copy_in_response.go b/pgproto3/copy_in_response.go
index 80733adc..4584f7df 100644
--- a/pgproto3/copy_in_response.go
+++ b/pgproto3/copy_in_response.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CopyInResponse struct {
diff --git a/pgproto3/copy_out_response.go b/pgproto3/copy_out_response.go
index 5e607e3a..3175c6a4 100644
--- a/pgproto3/copy_out_response.go
+++ b/pgproto3/copy_out_response.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CopyOutResponse struct {
diff --git a/pgproto3/data_row.go b/pgproto3/data_row.go
index 63768761..0bfe9a0d 100644
--- a/pgproto3/data_row.go
+++ b/pgproto3/data_row.go
@@ -5,7 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type DataRow struct {
diff --git a/pgproto3/describe.go b/pgproto3/describe.go
index 0d825db1..f131d1f4 100644
--- a/pgproto3/describe.go
+++ b/pgproto3/describe.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Describe struct {
diff --git a/pgproto3/execute.go b/pgproto3/execute.go
index 8bae6133..a5fee7cb 100644
--- a/pgproto3/execute.go
+++ b/pgproto3/execute.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Execute struct {
diff --git a/pgproto3/function_call.go b/pgproto3/function_call.go
index b3a22c4f..2c4f38df 100644
--- a/pgproto3/function_call.go
+++ b/pgproto3/function_call.go
@@ -2,7 +2,8 @@ package pgproto3
 
 import (
 	"encoding/binary"
-	"github.com/jackc/pgio"
+
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type FunctionCall struct {
diff --git a/pgproto3/function_call_response.go b/pgproto3/function_call_response.go
index 53d64222..3d3606dd 100644
--- a/pgproto3/function_call_response.go
+++ b/pgproto3/function_call_response.go
@@ -5,7 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type FunctionCallResponse struct {
diff --git a/pgproto3/gss_enc_request.go b/pgproto3/gss_enc_request.go
index cf405a3e..30ffc08d 100644
--- a/pgproto3/gss_enc_request.go
+++ b/pgproto3/gss_enc_request.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const gssEncReqNumber = 80877104
diff --git a/pgproto3/notification_response.go b/pgproto3/notification_response.go
index e762eb96..03ce51e5 100644
--- a/pgproto3/notification_response.go
+++ b/pgproto3/notification_response.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type NotificationResponse struct {
diff --git a/pgproto3/parameter_description.go b/pgproto3/parameter_description.go
index e28965c8..374d38a3 100644
--- a/pgproto3/parameter_description.go
+++ b/pgproto3/parameter_description.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type ParameterDescription struct {
diff --git a/pgproto3/parameter_status.go b/pgproto3/parameter_status.go
index c4021d92..a303e453 100644
--- a/pgproto3/parameter_status.go
+++ b/pgproto3/parameter_status.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type ParameterStatus struct {
diff --git a/pgproto3/parse.go b/pgproto3/parse.go
index 723885d4..b53200dc 100644
--- a/pgproto3/parse.go
+++ b/pgproto3/parse.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Parse struct {
diff --git a/pgproto3/password_message.go b/pgproto3/password_message.go
index cae76c50..41f98692 100644
--- a/pgproto3/password_message.go
+++ b/pgproto3/password_message.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type PasswordMessage struct {
diff --git a/pgproto3/query.go b/pgproto3/query.go
index 41c93b4a..e963a0ec 100644
--- a/pgproto3/query.go
+++ b/pgproto3/query.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Query struct {
diff --git a/pgproto3/row_description.go b/pgproto3/row_description.go
index a2e0d28e..6f6f0681 100644
--- a/pgproto3/row_description.go
+++ b/pgproto3/row_description.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const (
diff --git a/pgproto3/sasl_initial_response.go b/pgproto3/sasl_initial_response.go
index f862f2a8..eeda4691 100644
--- a/pgproto3/sasl_initial_response.go
+++ b/pgproto3/sasl_initial_response.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type SASLInitialResponse struct {
diff --git a/pgproto3/sasl_response.go b/pgproto3/sasl_response.go
index d402759a..54c3d96f 100644
--- a/pgproto3/sasl_response.go
+++ b/pgproto3/sasl_response.go
@@ -4,7 +4,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type SASLResponse struct {
diff --git a/pgproto3/ssl_request.go b/pgproto3/ssl_request.go
index 96ce489e..1b00c16b 100644
--- a/pgproto3/ssl_request.go
+++ b/pgproto3/ssl_request.go
@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const sslRequestNumber = 80877103
diff --git a/pgproto3/startup_message.go b/pgproto3/startup_message.go
index 5f1cd24f..5c974f02 100644
--- a/pgproto3/startup_message.go
+++ b/pgproto3/startup_message.go
@@ -7,7 +7,7 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const ProtocolVersionNumber = 196608 // 3.0
diff --git a/pgtype/array.go b/pgtype/array.go
index 3648f385..8de2b4dd 100644
--- a/pgtype/array.go
+++ b/pgtype/array.go
@@ -10,7 +10,7 @@ import (
 	"strings"
 	"unicode"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // Information on the internals of PostgreSQL arrays can be found in
diff --git a/pgtype/array_codec.go b/pgtype/array_codec.go
index 74bcc5d3..84012083 100644
--- a/pgtype/array_codec.go
+++ b/pgtype/array_codec.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"reflect"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // ArrayGetter is a type that can be converted into a PostgreSQL array.
diff --git a/pgtype/bits.go b/pgtype/bits.go
index 12df03d5..5b0671ca 100644
--- a/pgtype/bits.go
+++ b/pgtype/bits.go
@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"fmt"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type BitsScanner interface {
diff --git a/pgtype/box.go b/pgtype/box.go
index 25d4f153..d6087eab 100644
--- a/pgtype/box.go
+++ b/pgtype/box.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type BoxScanner interface {
diff --git a/pgtype/circle.go b/pgtype/circle.go
index 6dfb4fae..4b499a12 100644
--- a/pgtype/circle.go
+++ b/pgtype/circle.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type CircleScanner interface {
diff --git a/pgtype/composite.go b/pgtype/composite.go
index 5a67c3df..af6ed28b 100644
--- a/pgtype/composite.go
+++ b/pgtype/composite.go
@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // CompositeIndexGetter is a type accessed by index that can be converted into a PostgreSQL composite.
diff --git a/pgtype/date.go b/pgtype/date.go
index f59508d3..1d27fc78 100644
--- a/pgtype/date.go
+++ b/pgtype/date.go
@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type DateScanner interface {
diff --git a/pgtype/float4.go b/pgtype/float4.go
index 9b31579f..127eb56a 100644
--- a/pgtype/float4.go
+++ b/pgtype/float4.go
@@ -7,7 +7,7 @@ import (
 	"math"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Float4 struct {
diff --git a/pgtype/float8.go b/pgtype/float8.go
index 30548b88..b8b962b2 100644
--- a/pgtype/float8.go
+++ b/pgtype/float8.go
@@ -7,7 +7,7 @@ import (
 	"math"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Float64Scanner interface {
diff --git a/pgtype/hstore.go b/pgtype/hstore.go
index 46b3d236..7f0fa8c2 100644
--- a/pgtype/hstore.go
+++ b/pgtype/hstore.go
@@ -10,7 +10,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type HstoreScanner interface {
diff --git a/pgtype/int.go b/pgtype/int.go
index a799f2bf..ebac1403 100644
--- a/pgtype/int.go
+++ b/pgtype/int.go
@@ -9,7 +9,7 @@ import (
 	"math"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Int64Scanner interface {
diff --git a/pgtype/int.go.erb b/pgtype/int.go.erb
index d3c519a7..3b5b14a9 100644
--- a/pgtype/int.go.erb
+++ b/pgtype/int.go.erb
@@ -7,7 +7,7 @@ import (
 	"math"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Int64Scanner interface {
diff --git a/pgtype/interval.go b/pgtype/interval.go
index b4dcf0a6..882fd6d6 100644
--- a/pgtype/interval.go
+++ b/pgtype/interval.go
@@ -7,7 +7,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const (
diff --git a/pgtype/line.go b/pgtype/line.go
index c9cac4a7..087c7688 100644
--- a/pgtype/line.go
+++ b/pgtype/line.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type LineScanner interface {
diff --git a/pgtype/lseg.go b/pgtype/lseg.go
index 4243f6e0..f5cf888e 100644
--- a/pgtype/lseg.go
+++ b/pgtype/lseg.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type LsegScanner interface {
diff --git a/pgtype/numeric.go b/pgtype/numeric.go
index 41bf1432..58707a02 100644
--- a/pgtype/numeric.go
+++ b/pgtype/numeric.go
@@ -10,7 +10,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // PostgreSQL internal numeric storage uses 16-bit "digits" with base of 10,000
diff --git a/pgtype/path.go b/pgtype/path.go
index 3b8e598e..10767404 100644
--- a/pgtype/path.go
+++ b/pgtype/path.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type PathScanner interface {
diff --git a/pgtype/point.go b/pgtype/point.go
index 8df57703..d2ddaf2f 100644
--- a/pgtype/point.go
+++ b/pgtype/point.go
@@ -9,7 +9,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Vec2 struct {
diff --git a/pgtype/polygon.go b/pgtype/polygon.go
index ca479965..a7a6d606 100644
--- a/pgtype/polygon.go
+++ b/pgtype/polygon.go
@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type PolygonScanner interface {
diff --git a/pgtype/range_codec.go b/pgtype/range_codec.go
index 0fa43a68..207e3b39 100644
--- a/pgtype/range_codec.go
+++ b/pgtype/range_codec.go
@@ -4,7 +4,7 @@ import (
 	"database/sql/driver"
 	"fmt"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 // RangeValuer is a type that can be converted into a PostgreSQL range.
diff --git a/pgtype/tid.go b/pgtype/tid.go
index 5faa7502..6eefd34e 100644
--- a/pgtype/tid.go
+++ b/pgtype/tid.go
@@ -7,7 +7,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type TIDScanner interface {
diff --git a/pgtype/time.go b/pgtype/time.go
index dc40f1fc..9005b848 100644
--- a/pgtype/time.go
+++ b/pgtype/time.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type TimeScanner interface {
diff --git a/pgtype/timestamp.go b/pgtype/timestamp.go
index 03fb2b28..3a0bd275 100644
--- a/pgtype/timestamp.go
+++ b/pgtype/timestamp.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const pgTimestampFormat = "2006-01-02 15:04:05.999999999"
diff --git a/pgtype/timestamptz.go b/pgtype/timestamptz.go
index 8be5970c..5069af02 100644
--- a/pgtype/timestamptz.go
+++ b/pgtype/timestamptz.go
@@ -7,7 +7,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 const pgTimestamptzHourFormat = "2006-01-02 15:04:05.999999999Z07"
diff --git a/pgtype/uint32.go b/pgtype/uint32.go
index d406f79b..297ca5c2 100644
--- a/pgtype/uint32.go
+++ b/pgtype/uint32.go
@@ -7,7 +7,7 @@ import (
 	"math"
 	"strconv"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
 type Uint32Scanner interface {
diff --git a/values.go b/values.go
index 075ac2ff..67363986 100644
--- a/values.go
+++ b/values.go
@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"time"
 
-	"github.com/jackc/pgio"
+	"github.com/jackc/pgx/v5/internal/pgio"
 	"github.com/jackc/pgx/v5/pgtype"
 )