diff --git a/Cargo.toml b/Cargo.toml
index 8ddd356..69a7170 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,9 @@ tracing = "0.1"
 pyo3 = { version = "0.19", features = ["extension-module"] }
 ruint = { version = "1.10", features = ["pyo3"] }
 
+# transitive dependency; pass feature flags for portable build
+blst = { version = "0.3.11", features = ["portable"] }
+
 # needed for ethersdb
 ethers-core = "2.0.14"
 ethers-providers = "2.0.14"