diff --git a/Cargo.lock b/Cargo.lock
index d0f14a96c8e..a74747c39df 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -77,7 +77,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be14c7498ea50828a38d0e24a765ed2effe92a705885b57d029cd67d45744072"
 dependencies = [
  "cipher",
- "opaque-debug 0.3.0",
+ "opaque-debug",
 ]
 
 [[package]]
@@ -87,7 +87,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ea2e11f5e94c2f7d386164cc2aa1f97823fed6f259e486940a71c174dd01b0ce"
 dependencies = [
  "cipher",
- "opaque-debug 0.3.0",
+ "opaque-debug",
 ]
 
 [[package]]
@@ -408,25 +408,13 @@ dependencies = [
  "constant_time_eq",
 ]
 
-[[package]]
-name = "block-buffer"
-<ersion = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
-dependencies = [
- "block-padding 0.1.5",
- "byte-tools",
- "byteorder",
- "generic-array 0.12.3",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
 dependencies = [
- "generic-array 0.14.4",
+ "generic-array",
 ]
 
 [[package]]
@@ -435,19 +423,10 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57a0e8073e8baa88212fb5823574c02ebccb395136ba9a164ab89379ec6072f0"
 dependencies = [
- "block-padding 0.2.1",
+ "block-padding",
  "cipher",
 ]
 
-[[package]]
-name = "block-padding"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
-dependencies = [
- "byte-tools",
-]
-
 [[package]]
 name = "block-padding"
 version = "0.2.1"
@@ -595,7 +574,7 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "12f8e7987cbd042a63249497f41aed09f8e65add917ea6566effbc56578d6801"
 dependencies = [
- "generic-array 0.14.4",
+ "generic-array",
 ]
 
 [[package]]
@@ -2784,7 +2763,7 @@ checksum = "5dcf30702f15c157e348b4ccef28b1224fc7da8f8430d553bdc47b2d6599107b"
 dependencies = [
  "blake2b_simd",
  "byteorder",
- "digest 0.9.0",
+ "digest",
  "funty",
  "jubjub",
  "rand_core 0.6.2",
diff --git a/zebra-chain/Cargo.toml b/zebra-chain/Cargo.toml
index ce2bf85262d..75f973233b8 100644
--- a/zebra-chain/Cargo.toml
+++ b/zebra-chain/Cargo.toml
@@ -53,10 +53,10 @@ ed25519-zebra = "2"
 equihash = "0.1"
 redjubjub = "0.4"
 
+zebra-test = { path = "../zebra-test/", optional = true }
 
 [dev-dependencies]
 bincode = "1"
-
 color-eyre = "0.5.11"
 criterion = { version = "0.3", features = ["html_reports"] }
 spandoc = "0.2"
diff --git a/zebra-chain/src/sapling.rs b/zebra-chain/src/sapling.rs
index cabd65a5c36..f93abb31ff2 100644
--- a/zebra-chain/src/sapling.rs
+++ b/zebra-chain/src/sapling.rs
@@ -5,8 +5,6 @@ mod address;
 mod arbitrary;
 mod commitment;
 mod note;
-mod output;
-mod spend;
 #[cfg(test)]
 mod tests;
 
diff --git a/zebra-chain/src/serialization/serde_helpers.rs b/zebra-chain/src/serialization/serde_helpers.rs
index 05fc674dab7..9d462543152 100644
--- a/zebra-chain/src/serialization/serde_helpers.rs
+++ b/zebra-chain/src/serialization/serde_helpers.rs
@@ -76,10 +76,3 @@ impl From<Base> for pallas::Base {
         pallas::Base::from_bytes(&local.bytes).unwrap()
     }
 }
-
-#[derive(Deserialize, Serialize)]
-#[serde(remote = "futures::future::Either")]
-pub enum Either<A, B> {
-    Left(A),
-    Right(B),
-}