diff --git a/Cargo.lock b/Cargo.lock
index 8e4df6ce..52b97dc4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -143,9 +143,9 @@ checksum = "5c8214115b7bf84099f1309324e63141d4c5d7cc26862f97a0a857dbefe165bd"
 
 [[package]]
 name = "blobby"
-version = "0.4.0-pre.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e4db6eec520c1f3d3b060c5b67527c3d1d4122d9f0ff47edf0149a7ffa34cebb"
+checksum = "89af0b093cc13baa4e51e64e65ec2422f7e73aea0e612e5ad3872986671622f1"
 
 [[package]]
 name = "block-buffer"
diff --git a/aes-siv/Cargo.toml b/aes-siv/Cargo.toml
index 0f196759..8d48f3d3 100644
--- a/aes-siv/Cargo.toml
+++ b/aes-siv/Cargo.toml
@@ -31,7 +31,7 @@ pmac = { version = "0.8.0-rc.1", optional = true }
 
 [dev-dependencies]
 aead = { version = "0.6.0-rc.2", features = ["alloc", "dev"], default-features = false }
-blobby = "0.4.0-pre.0"
+blobby = "0.4.0"
 hex-literal = "1"
 
 [features]