diff --git a/Cargo.toml b/Cargo.toml
index 542b5d19e..4a1917e4f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,3 +13,4 @@ rustc-serialize = "0.3"
 arrayvec = "0.3"
 mio = "0.*"
 rand = "0.*"
+tiny-keccak = "0.1"