diff --git a/eth2/utils/bls/Cargo.toml b/eth2/utils/bls/Cargo.toml
index dcace15c81..04d90293e2 100644
--- a/eth2/utils/bls/Cargo.toml
+++ b/eth2/utils/bls/Cargo.toml
@@ -5,10 +5,11 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
-bls-aggregates = { git = "https://github.com/sigp/signature-schemes", tag = "0.6.1" }
+bls-aggregates = { git = "https://github.com/sigp/signature-schemes", tag = "0.7.0" }
 cached_tree_hash = { path = "../cached_tree_hash" }
 hashing = { path = "../hashing" }
 hex = "0.3"
+rand = "0.5"
 serde = "1.0"
 serde_derive = "1.0"
 serde_hex = { path = "../serde_hex" }
diff --git a/eth2/utils/bls/src/secret_key.rs b/eth2/utils/bls/src/secret_key.rs
index 620780261b..6fdc702c61 100644
--- a/eth2/utils/bls/src/secret_key.rs
+++ b/eth2/utils/bls/src/secret_key.rs
@@ -1,3 +1,5 @@
+extern crate rand;
+
 use super::BLS_SECRET_KEY_BYTE_SIZE;
 use bls_aggregates::SecretKey as RawSecretKey;
 use hex::encode as hex_encode;
@@ -16,7 +18,7 @@ pub struct SecretKey(RawSecretKey);
 
 impl SecretKey {
     pub fn random() -> Self {
-        SecretKey(RawSecretKey::random())
+        SecretKey(RawSecretKey::random(&mut rand::thread_rng()))
     }
 
     /// Returns the underlying point as compressed bytes.