diff --git a/Cargo.toml b/Cargo.toml
index 6e6fc93..efd52cf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,4 +7,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+blake2b_simd = "0.5"
 jubjub = { git = "https://github.com/zkcrypto/jubjub", rev = "e83f7d2bd136498a27f9d943fea635d8682bf2c6" }