diff --git a/Cargo.toml b/Cargo.toml
index b6b6511..3b06faf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ byteorder = "1.2.7"
 fnv = "1.0.6"
 rand = "0.6.5"
 rand_hc = "0.1.0"
-rand_core = "0.4.0"
+rand_core = "0.6.3"
 lru_time_cache = "0.9.0"
 structopt = "0.2.13"
 itertools = "0.8.0"