diff --git a/Cargo.toml b/Cargo.toml
index e353fe4..10c47a2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,18 +26,18 @@ features = ["nightly", "simd_backend"]
 travis-ci = { repository = "dalek-cryptography/curve25519-dalek", branch = "master"}
 
 [dev-dependencies]
-rand_os = "0.1"
+rand_os = "0.2"
 sha2 = { version = "0.8", default-features = false }
 bincode = "1"
 criterion = "0.2"
-rand = "0.6"
+rand = "0.7"
 
 [[bench]]
 name = "dalek_benchmarks"
 harness = false
 
 [dependencies]
-rand_core = { version = "0.3", default-features = false }
+rand_core = { version = "0.5", default-features = false }
 byteorder = { version = "^1.2.3", default-features = false, features = ["i128"] }
 digest = { version = "0.8", default-features = false }
 subtle = { version = "2", default-features = false }