diff --git a/Cargo.lock b/Cargo.lock
index 1862ddd4..1ecbedd2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -375,11 +375,9 @@ dependencies = [
  "aead-stream",
  "aes",
  "cipher",
- "ctr",
  "dbl",
  "hex-literal",
  "subtle",
- "zeroize",
 ]
 
 [[package]]
diff --git a/ocb3/Cargo.toml b/ocb3/Cargo.toml
index c830e910..c33dc0a0 100644
--- a/ocb3/Cargo.toml
+++ b/ocb3/Cargo.toml
@@ -18,11 +18,9 @@ rust-version = "1.85"
 [dependencies]
 aead = { version = "0.6", default-features = false }
 cipher = "0.5"
-ctr = "0.10"
 dbl = "0.5"
 subtle = { version = "2", default-features = false }
 aead-stream = { version = "0.6", optional = true, default-features = false }
-zeroize = { version = "1", optional = true, default-features = false }
 
 [dev-dependencies]
 aead = { version = "0.6", features = ["dev"], default-features = false }