diff --git a/Cargo.toml b/Cargo.toml
index d3726c4..a35b2e5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ arrayref = "0.3.3"
 sha2 = "^0.4"
 
 [dependencies.curve25519-dalek]
-version = "^0.3"
+version = "^0.4"
 default-features = false
 
 [dependencies.rand]
diff --git a/src/ed25519.rs b/src/ed25519.rs
index 32abbc7..a2ac9d2 100644
--- a/src/ed25519.rs
+++ b/src/ed25519.rs
@@ -22,7 +22,7 @@ use curve25519_dalek::curve::CompressedEdwardsY;
 use curve25519_dalek::curve::ExtendedPoint;
 use curve25519_dalek::curve::ProjectivePoint;
 use curve25519_dalek::scalar::Scalar;
-use curve25519_dalek::util::arrays_equal_ct;
+use curve25519_dalek::subtle::arrays_equal_ct;
 
 pub const SIGNATURE_LENGTH: usize = 64;