diff --git a/eth2/utils/bls/Cargo.toml b/eth2/utils/bls/Cargo.toml
index 0dc64e483..5148cb7f2 100644
--- a/eth2/utils/bls/Cargo.toml
+++ b/eth2/utils/bls/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
-bls-aggregates = { git = "https://github.com/sigp/signature-schemes" }
+bls-aggregates = { git = "https://github.com/sigp/signature-schemes", tag = "v0.3.0" }
 hashing = { path = "../hashing" }
 hex = "0.3"
 ssz = { path = "../ssz" }