diff --git a/grin/Cargo.toml b/grin/Cargo.toml
index 2373e4114..6640d27fc 100644
--- a/grin/Cargo.toml
+++ b/grin/Cargo.toml
@@ -17,6 +17,7 @@ secp256k1zkp = { path = "../secp256k1zkp" }
 
 cuckoo_miner = { git = "https://github.com/mimblewimble/cuckoo-miner", tag="grin_integration_2"}
 
+blake2-rfc = "~0.2.17"
 env_logger="^0.3.5"
 futures = "^0.1.9"
 futures-cpupool = "^0.1.3"
@@ -28,5 +29,4 @@ serde_derive = "~1.0.8"
 tokio-core="^0.1.1"
 tokio-timer="^0.1.0"
 rand = "^0.3"
-tiny-keccak = "1.1"
 lazy_static = "0.2.8"