diff --git a/crypto/ecdsa/signer.go b/crypto/ecdsa/signer.go
index 4962b9d..adba59b 100644
--- a/crypto/ecdsa/signer.go
+++ b/crypto/ecdsa/signer.go
@@ -31,7 +31,16 @@ func (x Signer) Sign(data []byte) ([]byte, error) {
 		return nil, err
 	}
 
-	return elliptic.Marshal(elliptic.P256(), r, s), nil
+	params := elliptic.P256().Params()
+	curveOrderByteSize := params.P.BitLen() / 8
+
+	buf := make([]byte, 1+curveOrderByteSize*2)
+	buf[0] = 4
+
+	_ = r.FillBytes(buf[1 : 1+curveOrderByteSize])
+	_ = s.FillBytes(buf[1+curveOrderByteSize:])
+
+	return buf, nil
 }
 
 // Public initializes PublicKey and returns it as neofscrypto.PublicKey.
diff --git a/go.mod b/go.mod
index 5b296ff..db7dbe5 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/mr-tron/base58 v1.2.0
 	github.com/nspcc-dev/hrw v1.0.9
 	github.com/nspcc-dev/neo-go v0.99.1
-	github.com/nspcc-dev/neofs-api-go/v2 v2.13.1
+	github.com/nspcc-dev/neofs-api-go/v2 v2.13.2-0.20220818094951-98db3fa28419
 	github.com/nspcc-dev/neofs-contract v0.15.3
 	github.com/nspcc-dev/tzhash v1.6.1
 	github.com/stretchr/testify v1.7.0
diff --git a/go.sum b/go.sum
index ee2223a..4fc9621 100644
Binary files a/go.sum and b/go.sum differ