diff --git a/AUTHORS b/AUTHORS
deleted file mode 100644
index 15167cd..0000000
--- a/AUTHORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code refers to The Go Authors for copyright purposes.
-# The master list of authors is in the main Go distribution,
-# visible at http://tip.golang.org/AUTHORS.
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
deleted file mode 100644
index 1c4577e..0000000
--- a/CONTRIBUTORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code was written by the Go contributors.
-# The master list of contributors is in the main Go distribution,
-# visible at http://tip.golang.org/CONTRIBUTORS.
diff --git a/go.mod b/go.mod
index edf0e5b..5a4a49c 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module golang.org/x/term
 
 go 1.17
 
-require golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1
+require golang.org/x/sys v0.9.0
diff --git a/go.sum b/go.sum
index ff13213..cb35c1f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.9.0 h1:KS/R3tvhPqvJvwcKfnBHJwwthS11LRhmM5D59eEXa0s=
+golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/term.go b/term.go
index d592708..1a40d10 100644
--- a/term.go
+++ b/term.go
@@ -7,11 +7,11 @@
 //
 // Putting a terminal into raw mode is the most common requirement:
 //
-// 	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
-// 	if err != nil {
-// 	        panic(err)
-// 	}
-// 	defer term.Restore(int(os.Stdin.Fd()), oldState)
+//	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
+//	if err != nil {
+//	        panic(err)
+//	}
+//	defer term.Restore(int(os.Stdin.Fd()), oldState)
 //
 // Note that on non-Unix systems os.Stdin.Fd() may not be 0.
 package term
diff --git a/term_test.go b/term_test.go
index ec1db03..561f3d4 100644
--- a/term_test.go
+++ b/term_test.go
@@ -5,7 +5,6 @@
 package term_test
 
 import (
-	"io/ioutil"
 	"os"
 	"runtime"
 	"testing"
@@ -14,7 +13,7 @@ import (
 )
 
 func TestIsTerminalTempFile(t *testing.T) {
-	file, err := ioutil.TempFile("", "TestIsTerminalTempFile")
+	file, err := os.CreateTemp("", "TestIsTerminalTempFile")
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/terminal.go b/terminal.go
index 535ab82..f636667 100644
--- a/terminal.go
+++ b/terminal.go
@@ -233,7 +233,6 @@ func (t *Terminal) queue(data []rune) {
 	t.outBuf = append(t.outBuf, []byte(string(data))...)
 }
 
-var eraseUnderCursor = []rune{' ', keyEscape, '[', 'D'}
 var space = []rune{' '}
 
 func isPrintable(key rune) bool {
@@ -935,7 +934,7 @@ func (s *stRingBuffer) Add(a string) {
 // next most recent, and so on. If such an element doesn't exist then ok is
 // false.
 func (s *stRingBuffer) NthPreviousEntry(n int) (value string, ok bool) {
-	if n >= s.size {
+	if n < 0 || n >= s.size {
 		return "", false
 	}
 	index := s.head - n