diff --git a/go.mod b/go.mod
index c12fab7e1a..754f260293 100644
--- a/go.mod
+++ b/go.mod
@@ -59,7 +59,7 @@ require (
 	go.opencensus.io v0.24.0
 	go.uber.org/mock v0.6.0
 	golang.org/x/net v0.53.0
-	golang.org/x/sync v0.20.0
+	golang.org/x/sync v0.21.0
 	golang.org/x/sys v0.43.0
 	google.golang.org/grpc v1.80.0
 	google.golang.org/protobuf v1.36.11
diff --git a/go.sum b/go.sum
index ce144cee6c..67863e592a 100644
--- a/go.sum
+++ b/go.sum
@@ -1388,8 +1388,8 @@ golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sync v0.12.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sync v0.13.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vendor/golang.org/x/sync/errgroup/errgroup.go b/vendor/golang.org/x/sync/errgroup/errgroup.go
index f69fd75468..c261a8ebbd 100644
--- a/vendor/golang.org/x/sync/errgroup/errgroup.go
+++ b/vendor/golang.org/x/sync/errgroup/errgroup.go
@@ -109,7 +109,7 @@ func (g *Group) TryGo(f func() error) bool {
 	if g.sem != nil {
 		select {
 		case g.sem <- token{}:
-			// Note: this allows barging iff channels in general allow barging.
+			// Note: this allows barging if and only if channels in general allow barging.
 		default:
 			return false
 		}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index c9d971c854..1a091ee85b 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -647,7 +647,7 @@ golang.org/x/net/internal/httpsfv
 golang.org/x/net/internal/timeseries
 golang.org/x/net/netutil
 golang.org/x/net/trace
-# golang.org/x/sync v0.20.0
+# golang.org/x/sync v0.21.0
 ## explicit; go 1.25.0
 golang.org/x/sync/errgroup
 # golang.org/x/sys v0.43.0