diff --git a/vendor.mod b/vendor.mod
index 0b92353e90..9cdb7919a2 100644
--- a/vendor.mod
+++ b/vendor.mod
@@ -100,6 +100,6 @@ require (
 	golang.org/x/time v0.6.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20240604185151-ef581f913117 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 // indirect
-	google.golang.org/grpc v1.66.2 // indirect
+	google.golang.org/grpc v1.66.3 // indirect
 	google.golang.org/protobuf v1.35.1 // indirect
 )
diff --git a/vendor.sum b/vendor.sum
index 825cce904b..4056c9ecb1 100644
--- a/vendor.sum
+++ b/vendor.sum
@@ -421,8 +421,8 @@ google.golang.org/genproto/googleapis/api v0.0.0-20240604185151-ef581f913117/go.
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 h1:1GBuWVLM/KMVUv1t1En5Gs+gFZCNd360GGb4sSxtrhU=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
 google.golang.org/grpc v1.0.5/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
-google.golang.org/grpc v1.66.2 h1:3QdXkuq3Bkh7w+ywLdLvM56cmGvQHUMZpiCzt6Rqaoo=
-google.golang.org/grpc v1.66.2/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
+google.golang.org/grpc v1.66.3 h1:TWlsh8Mv0QI/1sIbs1W36lqRclxrmF+eFJ4DbI0fuhA=
+google.golang.org/grpc v1.66.3/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
diff --git a/vendor/google.golang.org/grpc/internal/transport/transport.go b/vendor/google.golang.org/grpc/internal/transport/transport.go
index fdd6fa86cc..924ba4f365 100644
--- a/vendor/google.golang.org/grpc/internal/transport/transport.go
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -616,7 +616,7 @@ func (t *transportReader) ReadHeader(header []byte) (int, error) {
 		t.er = err
 		return 0, err
 	}
-	t.windowHandler(len(header))
+	t.windowHandler(n)
 	return n, nil
 }
 
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
index 7c70005d08..a8390e9f92 100644
--- a/vendor/google.golang.org/grpc/version.go
+++ b/vendor/google.golang.org/grpc/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.66.2"
+const Version = "1.66.3"
diff --git a/vendor/modules.txt b/vendor/modules.txt
index dc2119b6dc..1bd6aabd9e 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -416,7 +416,7 @@ google.golang.org/genproto/googleapis/api/httpbody
 ## explicit; go 1.20
 google.golang.org/genproto/googleapis/rpc/errdetails
 google.golang.org/genproto/googleapis/rpc/status
-# google.golang.org/grpc v1.66.2
+# google.golang.org/grpc v1.66.3
 ## explicit; go 1.21
 google.golang.org/grpc
 google.golang.org/grpc/attributes