diff --git a/Cargo.lock b/Cargo.lock
index 7047e6c26..181e9465a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -371,34 +371,13 @@ dependencies = [
  "constant_time_eq",
 ]
 
-[[package]]
-name = "block-buffer"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
-dependencies = [
- "block-padding",
- "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",
-]
-
-[[package]]
-name = "block-padding"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
-dependencies = [
- "byte-tools",
+ "generic-array",
 ]
 
 [[package]]
@@ -435,12 +414,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "65c1bf4a04a88c54f589125563643d773f3254b5c38571395e2b591c693bbc81"
 
-[[package]]
-name = "byte-tools"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
-
 [[package]]
 name = "bytemuck"
 version = "1.4.1"
@@ -792,7 +765,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8492de420e9e60bc9a1d66e2dbb91825390b738a388606600663fc529b4b307"
 dependencies = [
  "byteorder",
- "digest 0.9.0",
+ "digest",
  "rand_core 0.5.1",
  "serde",
  "subtle",
@@ -861,22 +834,13 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
 
-[[package]]
-name = "digest"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
-dependencies = [
- "generic-array 0.12.3",
-]
-
 [[package]]
 name = "digest"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
 dependencies = [
- "generic-array 0.14.4",
+ "generic-array",
 ]
 
 [[package]]
@@ -1181,15 +1145,6 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
-[[package]]
-name = "generic-array"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"
-dependencies = [
- "typenum",
-]
-
 [[package]]
 name = "generic-array"
 version = "0.14.4"
@@ -1986,12 +1941,6 @@ version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
-
 [[package]]
 name = "opaque-debug"
 version = "0.3.0"
@@ -2449,7 +2398,7 @@ checksum = "5dcf30702f15c157e348b4ccef28b1224fc7da8f8430d553bdc47b2d6599107b"
 dependencies = [
  "blake2b_simd",
  "byteorder",
- "digest 0.9.0",
+ "digest",
  "funty",
  "jubjub",
  "rand_core 0.6.2",
@@ -2575,13 +2524,13 @@ dependencies = [
 
 [[package]]
 name = "ripemd160"
-version = "0.8.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad5112e0dbbb87577bfbc56c42450235e3012ce336e29c5befd7807bd626da4a"
+checksum = "2eca4ecc81b7f313189bf73ce724400a07da2a6dac19588b03c8bd76a2dcc251"
 dependencies = [
- "block-buffer 0.7.3",
- "digest 0.8.1",
- "opaque-debug 0.2.3",
+ "block-buffer",
+ "digest",
+ "opaque-debug",
 ]
 
 [[package]]
@@ -2883,11 +2832,11 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fa827a14b29ab7f44778d14a88d3cb76e949c45083f7dbfa507d0cb699dc12de"
 dependencies = [
- "block-buffer 0.9.0",
+ "block-buffer",
  "cfg-if 1.0.0",
  "cpuid-bool",
- "digest 0.9.0",
- "opaque-debug 0.3.0",
+ "digest",
+ "opaque-debug",
 ]
 
 [[package]]
diff --git a/zebra-chain/Cargo.toml b/zebra-chain/Cargo.toml
index 0afb9aa57..4a269fbcd 100644
--- a/zebra-chain/Cargo.toml
+++ b/zebra-chain/Cargo.toml
@@ -29,7 +29,7 @@ jubjub = "0.6.0"
 lazy_static = "1.4.0"
 primitive-types = "0.9.0"
 rand_core = "0.6"
-ripemd160 = "0.8.0"
+ripemd160 = "0.9"
 secp256k1 = { version = "0.20.1", features = ["serde"] }
 serde = { version = "1", features = ["serde_derive", "rc"] }
 serde-big-array = "0.3.2"
diff --git a/zebra-chain/src/transparent/address.rs b/zebra-chain/src/transparent/address.rs
index 1a51d0045..6d70c4eb7 100644
--- a/zebra-chain/src/transparent/address.rs
+++ b/zebra-chain/src/transparent/address.rs
@@ -4,7 +4,7 @@ use std::{fmt, io};
 
 use ripemd160::{Digest, Ripemd160};
 use secp256k1::PublicKey;
-use sha2::{Digest as sha2Digest, Sha256};
+use sha2::Sha256;
 
 #[cfg(test)]
 use proptest::{arbitrary::Arbitrary, collection::vec, prelude::*};