diff --git a/Cargo.toml b/Cargo.toml
index 49cdaaf..269c58c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ pkcs8 = { version = "0.10.1", optional = true, features = ["alloc", "pem"] }
 rand_core = "0.6"
 serde = { version = "1", default-features = false, optional = true, features = ["derive"] }
 sha2 = { version = "0.10", default-features = false }
-subtle = "2.5.0"
+subtle = { version = "2.5.0", default-features = false }
 zeroize = { version = "1.5", features = [ "zeroize_derive" ] }
 
 [dev-dependencies]
@@ -46,7 +46,7 @@ default = ["serde", "std"]
 pem = ["der", "ed25519/pem"]
 pkcs8 = ["dep:pkcs8"]
 serde = ["dep:serde", "ed25519/serde"]
-std = ["ed25519/std"]
+std = ["ed25519/std", "subtle/std"]
 
 [[test]]
 name = "rfc8032"