diff --git a/stream_test.go b/stream_test.go
index 0c2d24b..a7b62ef 100644
--- a/stream_test.go
+++ b/stream_test.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"crypto/rand"
-	"encoding/gob"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -258,7 +258,7 @@ func TestTruncated(t *testing.T) {
 
 // TestGolden tests against known test vectors.
 func TestGolden(t *testing.T) {
-	f, err := os.Open(filepath.Join("testdata", "golden.gob.gz"))
+	f, err := os.Open(filepath.Join("testdata", "golden.json.gz"))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -270,7 +270,7 @@ func TestGolden(t *testing.T) {
 	}
 	t.Cleanup(func() { gzr.Close() })
 
-	dec := gob.NewDecoder(gzr)
+	dec := json.NewDecoder(gzr)
 	for i := 0; ; i++ {
 		var v golden.Vector
 		err := dec.Decode(&v)
diff --git a/testdata/gen.go b/testdata/gen.go
index dc7b3fc..1b364e8 100644
--- a/testdata/gen.go
+++ b/testdata/gen.go
@@ -1,4 +1,4 @@
-// +build ignore
+//go:build ignore
 
 package main
 
@@ -6,7 +6,7 @@ import (
 	"archive/zip"
 	"compress/gzip"
 	"crypto/rand"
-	"encoding/gob"
+	"encoding/json"
 	"io"
 	"os"
 
@@ -36,7 +36,7 @@ func main1() error {
 		return err
 	}
 
-	out, err := os.Create("golden.gob.gz")
+	out, err := os.Create("golden.json.gz")
 	if err != nil {
 		return err
 	}
@@ -48,7 +48,7 @@ func main1() error {
 	}
 	defer gzw.Close()
 
-	enc := gob.NewEncoder(gzw)
+	enc := json.NewEncoder(gzw)
 
 	for _, f := range r.File {
 		seed := make([]byte, 32)
diff --git a/testdata/golden.gob.gz b/testdata/golden.gob.gz
deleted file mode 100644
index bbbd46c..0000000
Binary files a/testdata/golden.gob.gz and /dev/null differ
diff --git a/testdata/golden.json.gz b/testdata/golden.json.gz
new file mode 100644
index 0000000..99189fe
Binary files /dev/null and b/testdata/golden.json.gz differ