diff --git a/.travis.yml b/.travis.yml
index 8408fb7..3a81bf9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: go
 
 go:
-  - 1.4
+  - 1.7
   - tip
\ No newline at end of file
diff --git a/cmd/check/main.go b/cmd/check/main.go
index f8370ef..6f4c2af 100644
--- a/cmd/check/main.go
+++ b/cmd/check/main.go
@@ -10,6 +10,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"io"
 	"net/url"
 	"os"
 	"path/filepath"
@@ -175,7 +176,7 @@ func (p *processor) do(ch <-chan string) {
 			}
 
 			if *sum {
-				_, err = tf.Seek(0, os.SEEK_SET)
+				_, err = tf.Seek(0, io.SeekStart)
 				if err != nil {
 					fmt.Println("DIED:", path, "error seeking back to 0:", err)
 					return
diff --git a/flac.go b/flac.go
index 3221be2..c370467 100644
--- a/flac.go
+++ b/flac.go
@@ -7,7 +7,6 @@ package tag
 import (
 	"errors"
 	"io"
-	"os"
 )
 
 // blockType is a type which represents an enumeration of valid FLAC blocks
@@ -80,7 +79,7 @@ func (m *metadataFLAC) readFLACMetadataBlock(r io.ReadSeeker) (last bool, err er
 		err = m.readPictureBlock(r)
 
 	default:
-		_, err = r.Seek(int64(blockLen), os.SEEK_CUR)
+		_, err = r.Seek(int64(blockLen), io.SeekCurrent)
 	}
 	return
 }
diff --git a/id.go b/id.go
index 4670192..2410356 100644
--- a/id.go
+++ b/id.go
@@ -3,7 +3,6 @@ package tag
 import (
 	"fmt"
 	"io"
-	"os"
 )
 
 // Identify identifies the format and file type of the data in the ReadSeeker.
@@ -13,7 +12,7 @@ func Identify(r io.ReadSeeker) (format Format, fileType FileType, err error) {
 		return
 	}
 
-	_, err = r.Seek(-11, os.SEEK_CUR)
+	_, err = r.Seek(-11, io.SeekCurrent)
 	if err != nil {
 		err = fmt.Errorf("could not seek back to original position: %v", err)
 		return
@@ -59,7 +58,7 @@ func Identify(r io.ReadSeeker) (format Format, fileType FileType, err error) {
 		return format, MP3, nil
 	}
 
-	n, err := r.Seek(-128, os.SEEK_END)
+	n, err := r.Seek(-128, io.SeekEnd)
 	if err != nil {
 		return
 	}
@@ -69,7 +68,7 @@ func Identify(r io.ReadSeeker) (format Format, fileType FileType, err error) {
 		return
 	}
 
-	_, err = r.Seek(-n, os.SEEK_CUR)
+	_, err = r.Seek(-n, io.SeekCurrent)
 	if err != nil {
 		return
 	}
diff --git a/id3v1.go b/id3v1.go
index c203eb1..3703a7d 100644
--- a/id3v1.go
+++ b/id3v1.go
@@ -7,7 +7,6 @@ package tag
 import (
 	"errors"
 	"io"
-	"os"
 	"strconv"
 	"strings"
 )
@@ -44,7 +43,7 @@ var ErrNotID3v1 = errors.New("invalid ID3v1 header")
 // ReadID3v1Tags reads ID3v1 tags from the io.ReadSeeker.  Returns ErrNotID3v1
 // if there are no ID3v1 tags, otherwise non-nil error if there was a problem.
 func ReadID3v1Tags(r io.ReadSeeker) (Metadata, error) {
-	_, err := r.Seek(-128, os.SEEK_END)
+	_, err := r.Seek(-128, io.SeekEnd)
 	if err != nil {
 		return nil, err
 	}
diff --git a/mp4.go b/mp4.go
index 239bcae..a6e3472 100644
--- a/mp4.go
+++ b/mp4.go
@@ -10,7 +10,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 	"strconv"
 )
 
@@ -113,7 +112,7 @@ func (m metadataMP4) readAtoms(r io.ReadSeeker) error {
 		}
 
 		if !ok {
-			_, err := r.Seek(int64(size-8), os.SEEK_CUR)
+			_, err := r.Seek(int64(size-8), io.SeekCurrent)
 			if err != nil {
 				return err
 			}
@@ -246,7 +245,7 @@ func readCustomAtom(r io.ReadSeeker, size uint32) (string, uint32, error) {
 		case "data":
 			// Found the "data" atom, rewind
 			dataSize = subSize + 8 // will need to re-read "data" + size (4 + 4)
-			_, err := r.Seek(-8, os.SEEK_CUR)
+			_, err := r.Seek(-8, io.SeekCurrent)
 			if err != nil {
 				return "", 0, err
 			}
diff --git a/ogg.go b/ogg.go
index 81f257d..bc26d4a 100644
--- a/ogg.go
+++ b/ogg.go
@@ -7,7 +7,6 @@ package tag
 import (
 	"errors"
 	"io"
-	"os"
 )
 
 const (
@@ -30,7 +29,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 
 	// Skip 22 bytes of Page header to read page_segments length byte at position 26
 	// See http://www.xiph.org/ogg/doc/framing.html
-	_, err = r.Seek(22, os.SEEK_CUR)
+	_, err = r.Seek(22, io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
@@ -41,7 +40,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 	}
 
 	// Seek and discard the segments
-	_, err = r.Seek(int64(nS), os.SEEK_CUR)
+	_, err = r.Seek(int64(nS), io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
@@ -57,7 +56,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 
 	// Seek and discard 29 bytes from common and identification header
 	// See http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-610004.2
-	_, err = r.Seek(29, os.SEEK_CUR)
+	_, err = r.Seek(29, io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
@@ -73,7 +72,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 	}
 
 	// Skip page 2 header, same as line 30
-	_, err = r.Seek(22, os.SEEK_CUR)
+	_, err = r.Seek(22, io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
@@ -83,7 +82,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 		return nil, err
 	}
 
-	_, err = r.Seek(int64(nS), os.SEEK_CUR)
+	_, err = r.Seek(int64(nS), io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
@@ -98,7 +97,7 @@ func ReadOGGTags(r io.ReadSeeker) (Metadata, error) {
 	}
 
 	// Seek and discard 6 bytes from common header
-	_, err = r.Seek(6, os.SEEK_CUR)
+	_, err = r.Seek(6, io.SeekCurrent)
 	if err != nil {
 		return nil, err
 	}
diff --git a/sum.go b/sum.go
index bc51658..97b27a7 100644
--- a/sum.go
+++ b/sum.go
@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"hash"
 	"io"
-	"os"
 )
 
 // Sum creates a checksum of the audio file data provided by the io.ReadSeeker which is metadata
@@ -18,7 +17,7 @@ func Sum(r io.ReadSeeker) (string, error) {
 		return "", err
 	}
 
-	_, err = r.Seek(-11, os.SEEK_CUR)
+	_, err = r.Seek(-11, io.SeekCurrent)
 	if err != nil {
 		return "", fmt.Errorf("could not seek back to original position: %v", err)
 	}
@@ -75,7 +74,7 @@ func SumAtoms(r io.ReadSeeker) (string, error) {
 		switch name {
 		case "meta":
 			// next_item_id (int32)
-			_, err := r.Seek(4, os.SEEK_CUR)
+			_, err := r.Seek(4, io.SeekCurrent)
 			if err != nil {
 				return "", err
 			}
@@ -93,7 +92,7 @@ func SumAtoms(r io.ReadSeeker) (string, error) {
 			return hashSum(h), nil
 		}
 
-		_, err = r.Seek(int64(size-8), os.SEEK_CUR)
+		_, err = r.Seek(int64(size-8), io.SeekCurrent)
 		if err != nil {
 			return "", fmt.Errorf("error reading '%v' tag: %v", name, err)
 		}
@@ -101,12 +100,12 @@ func SumAtoms(r io.ReadSeeker) (string, error) {
 }
 
 func sizeToEndOffset(r io.ReadSeeker, offset int64) (int64, error) {
-	n, err := r.Seek(-128, os.SEEK_END)
+	n, err := r.Seek(-128, io.SeekEnd)
 	if err != nil {
 		return 0, fmt.Errorf("error seeking end offset (%d bytes): %v", offset, err)
 	}
 
-	_, err = r.Seek(-n, os.SEEK_CUR)
+	_, err = r.Seek(-n, io.SeekCurrent)
 	if err != nil {
 		return 0, fmt.Errorf("error seeking back to original position: %v", err)
 	}
@@ -142,7 +141,7 @@ func SumID3v2(r io.ReadSeeker) (string, error) {
 		return "", fmt.Errorf("error reading ID3v2 header: %v", err)
 	}
 
-	_, err = r.Seek(int64(header.Size), os.SEEK_CUR)
+	_, err = r.Seek(int64(header.Size), io.SeekCurrent)
 	if err != nil {
 		return "", fmt.Errorf("error seeking to end of ID3V2 header: %v", err)
 	}
@@ -211,7 +210,7 @@ func skipFLACMetadataBlock(r io.ReadSeeker) (last bool, err error) {
 		return
 	}
 
-	_, err = r.Seek(int64(blockLen), os.SEEK_CUR)
+	_, err = r.Seek(int64(blockLen), io.SeekCurrent)
 	return
 }
 
diff --git a/tag.go b/tag.go
index 1e2f97a..edffac1 100644
--- a/tag.go
+++ b/tag.go
@@ -18,7 +18,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 )
 
 // ErrNoTagsFound is the error returned by ReadFrom when the metadata format
@@ -34,7 +33,7 @@ func ReadFrom(r io.ReadSeeker) (Metadata, error) {
 		return nil, err
 	}
 
-	_, err = r.Seek(-11, os.SEEK_CUR)
+	_, err = r.Seek(-11, io.SeekCurrent)
 	if err != nil {
 		return nil, fmt.Errorf("could not seek back to original position: %v", err)
 	}