diff --git a/Cargo.toml b/Cargo.toml
index e46b3a0..b58543f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,6 @@ readme = "README.md"
 
 [dependencies]
 rand = "0.7.3"
-rand_core = "0.5.1"
+rand_core = "0.6.4"
 sha3 = "0.9.1"
 curve25519-dalek = "3.2.1"