diff --git a/Cargo.toml b/Cargo.toml
index 3013842..9329b6c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2021"
 [dependencies]
 cfg-if = "1.0"
 blake2b-ref = "0.3.1"
-ckb-std = "0.10.0"
+ckb-std = {version = "0.10.0", optional = true}
 ckb-types = {version = "0.103.0", optional = true}
 molecule = {version = "0.7.2", default_features = false, optional = true}
 sparse-merkle-tree = {version = "0.6.1", default_features = false}