diff --git a/Cargo.toml b/Cargo.toml
index cd3cee9..0954026 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -56,7 +56,7 @@ xz2 = "0.1"
 [dev-dependencies]
 proptest = "^0.8"
 criterion = "^0.2"
-rand = "^0.5"
+rand = "^0.6"
 
 [[bench]]
 name = "index"