diff --git a/api/client/builder/client.go b/api/client/builder/client.go
index 223003c00817..67d9a93eed57 100644
--- a/api/client/builder/client.go
+++ b/api/client/builder/client.go
@@ -327,6 +327,7 @@ func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlyS
 		defer cancel()
 		versionOpt := func(r *http.Request) {
 			r.Header.Add("Eth-Consensus-Version", version.String(version.Capella))
+			r.Header.Add("User-Agent", version.BuildData())
 		}
 		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body), versionOpt)