diff --git a/Cargo.toml b/Cargo.toml
index c8901e4f..aefdd37d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ rustc-serialize = "0.3"
 newtype_derive = "0.1"
 custom_derive = "0.1"
 rand = "0.7.3"
-rand_core = "0.5.1"
+rand_core = "0.6.4"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"