diff --git a/arbnode/dataposter/data_poster.go b/arbnode/dataposter/data_poster.go
index 7bc18a2121..04789d0fda 100644
--- a/arbnode/dataposter/data_poster.go
+++ b/arbnode/dataposter/data_poster.go
@@ -217,6 +217,10 @@ func NewDataPoster(ctx context.Context, opts *DataPosterOpts) (*DataPoster, erro
 func rpcClient(ctx context.Context, opts *ExternalSignerCfg) (*rpc.Client, error) {
 	tlsCfg := &tls.Config{
 		MinVersion: tls.VersionTLS12,
+		// Dataposter verifies that signed transaction was signed by the account
+		// that it expects to be signed with. So signer is already authenticated
+		// on application level and does not need to rely on TLS for authentication.
+		InsecureSkipVerify: true, // #nosec G402
 	}
 
 	if opts.ClientCert != "" && opts.ClientPrivateKey != "" {