diff --git a/go.mod b/go.mod
index d4abba7..92830b9 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	fortio.org/dflag v1.9.3
 	fortio.org/log v1.18.3
 	fortio.org/version v1.0.4
-	golang.org/x/sys v0.38.0
+	golang.org/x/sys v0.39.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index e81a654..5fbfbac 100644
--- a/go.sum
+++ b/go.sum
@@ -20,5 +20,5 @@ github.com/kortschak/goroutine v1.1.3 h1:kELvAfi7jpVD7a+MPWjmIxuQVJVYo/RELaOeGJZ
 github.com/kortschak/goroutine v1.1.3/go.mod h1:zKpXs1FWN/6mXasDQzfl7g0LrGFIOiA6cLs9eXKyaMY=
 golang.org/x/crypto/x509roots/fallback v0.0.0-20250203165127-fa5273e46196 h1:jNA5ftLV4UJrgO6aUB7Jg372YkLI5SP7iHYy3s6in7g=
 golang.org/x/crypto/x509roots/fallback v0.0.0-20250203165127-fa5273e46196/go.mod h1:kNa9WdvYnzFwC79zRpLRMJbdEFlhyM5RPFBBZp/wWH8=
-golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
-golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=
+golang.org/x/sys v0.39.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=