diff --git a/Cargo.lock b/Cargo.lock
index 1e86d1c..5fca128 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,9 +107,9 @@ dependencies = [
 
 [[package]]
 name = "bumpalo"
-version = "3.12.0"
+version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d261e256854913907f67ed06efbc3338dfe6179796deefc1ff763fc1aee5535"
+checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
 [[package]]
 name = "byte-slice-cast"
@@ -171,9 +171,9 @@ checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "280a9f2d8b3a38871a3c8a46fb80db65e5e5ed97da80c4d08bf27fb63e35e181"
+checksum = "3e4c1eaa2012c47becbbad2ab175484c2a84d1185b566fb2cc5b8707343dfe58"
 dependencies = [
  "libc",
 ]
@@ -235,13 +235,13 @@ dependencies = [
 
 [[package]]
 name = "errno"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d6a0976c999d473fe89ad888d5a284e55366d9dc9038b1ba2aa15128c4afa0"
+checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
 dependencies = [
  "errno-dragonfly",
  "libc",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -265,9 +265,9 @@ dependencies = [
 
 [[package]]
 name = "flate2"
-version = "1.0.25"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8a2db397cb1c8772f31494cb8917e48cd1e64f0fa7efac59fbd741a0a8ce841"
+checksum = "3b9429470923de8e8cbd4d2dc513535400b4b3fef0319fb5c4e1f520a7bef743"
 dependencies = [
  "crc32fast",
  "miniz_oxide",
@@ -381,9 +381,9 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.8"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
 dependencies = [
  "cfg-if",
  "libc",
@@ -392,9 +392,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.3.16"
+version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5be7b54589b581f624f566bf5d8eb2bab1db736c51528720b6bd36b96b55924d"
+checksum = "17f8a914c2987b688368b5138aa05321db91f4090cf26118185672ad588bce21"
 dependencies = [
  "bytes",
  "fnv",
@@ -457,9 +457,9 @@ checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
 [[package]]
 name = "hyper"
-version = "0.14.25"
+version = "0.14.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc5e554ff619822309ffd57d8734d77cd5ce6238bc956f037ea06c58238c9899"
+checksum = "ab302d72a6f11a3b910431ff93aae7e773078c769f0a3ef15fb9ec692ed147d4"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -572,15 +572,15 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.141"
+version = "0.2.142"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3304a64d199bb964be99741b7a14d26972741915b3649639149b2479bb46f4b5"
+checksum = "6a987beff54b60ffa6d51982e1aa1146bc42f19bd26be28b0586f252fccf5317"
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.3.1"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d59d8c75012853d2e872fb56bc8a2e53718e2cafe1a4c823143141c6d90c322f"
+checksum = "b64f40e5e03e0d54f03845c8197d0291253cdbedfb1cb46b13c2c117554a9f4c"
 
 [[package]]
 name = "log"
@@ -605,9 +605,9 @@ checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
 [[package]]
 name = "miniz_oxide"
-version = "0.6.2"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b275950c28b37e794e8c55d88aeb5e139d0ce23fdbbeda68f8d7174abdf9e8fa"
+checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
 dependencies = [
  "adler",
 ]
@@ -666,9 +666,9 @@ checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
 [[package]]
 name = "openssl"
-version = "0.10.49"
+version = "0.10.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d2f106ab837a24e03672c59b1239669a0596406ff657c3c0835b6b7f0f35a33"
+checksum = "01b8574602df80f7b85fdfc5392fa884a4e3b3f4f35402c070ab34c3d3f78d56"
 dependencies = [
  "bitflags",
  "cfg-if",
@@ -687,7 +687,7 @@ checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -698,9 +698,9 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.84"
+version = "0.9.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a20eace9dc2d82904039cb76dcf50fb1a0bba071cfd1629720b5d6f1ddba0fa"
+checksum = "8e17f59264b2809d77ae94f0e1ebabc434773f370d6ca667bd223ea10e06cc7e"
 dependencies = [
  "cc",
  "libc",
@@ -710,9 +710,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.4.0"
+version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "637935964ff85a605d114591d4d2c13c5d1ba2806dae97cea6bf180238a749ac"
+checksum = "5ddb756ca205bd108aee3c62c6d3c994e1df84a59b9d6d4a5ea42ee1fd5a9a28"
 dependencies = [
  "arrayvec 0.7.2",
  "bitvec",
@@ -891,16 +891,16 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "0.37.7"
+version = "0.37.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2aae838e49b3d63e9274e1c01833cc8139d3fec468c3b84688c628f44b1ae11d"
+checksum = "8bbfc1d1c7c40c01715f47d71444744a81669ca84e8b63e25a55e169b1f86433"
 dependencies = [
  "bitflags",
  "errno",
  "io-lifetimes",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -1006,7 +1006,7 @@ checksum = "291a097c63d8497e00160b166a967a4a79c64f3facdd01cbd7502231688d77df"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1091,7 +1091,7 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "subcryptor"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "base58",
  "blake2-rfc",
@@ -1101,7 +1101,7 @@ dependencies = [
 
 [[package]]
 name = "subhasher"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "blake2-rfc",
  "byteorder",
@@ -1112,7 +1112,7 @@ dependencies = [
 
 [[package]]
 name = "submetadatan"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "array-bytes",
  "frame-metadata",
@@ -1125,7 +1125,7 @@ dependencies = [
 
 [[package]]
 name = "subrpcer"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "affix",
  "once_cell",
@@ -1138,14 +1138,14 @@ dependencies = [
 
 [[package]]
 name = "subruntimer"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "subspector"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "fxhash",
  "serde",
@@ -1154,7 +1154,7 @@ dependencies = [
 
 [[package]]
 name = "substorager"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "array-bytes",
  "parity-scale-codec",
@@ -1163,7 +1163,7 @@ dependencies = [
 
 [[package]]
 name = "subversioner"
-version = "0.10.0"
+version = "0.10.1"
 dependencies = [
  "serde",
 ]
@@ -1181,9 +1181,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.13"
+version = "2.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c9da457c5285ac1f936ebd076af6dac17a61cfe7826f2076b4d015cf47bc8ec"
+checksum = "a34fcf3e8b60f57e6a14301a2e916d323af98b0ea63c599441eec8558660c822"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1226,7 +1226,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1255,9 +1255,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.27.0"
+version = "1.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0de47a4eecbe11f498978a9b29d792f0d2692d1dd003650c24c76510e3bc001"
+checksum = "c3c786bf8134e5a3a166db9b29ab8f48134739014a3eca7bc6bfa95d673b136f"
 dependencies = [
  "autocfg",
  "bytes",
@@ -1265,7 +1265,7 @@ dependencies = [
  "mio",
  "pin-project-lite",
  "socket2",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -1280,9 +1280,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5427d89453009325de0d8f342c9490009f76e999cb7672d77e46267448f7e6b2"
+checksum = "806fe8c2c87eccc8b3267cbae29ed3ab2d0bd37fca70ab622e46aaa9375ddb7d"
 dependencies = [
  "bytes",
  "futures-core",
@@ -1317,10 +1317,11 @@ checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"
 
 [[package]]
 name = "tracing"
-version = "0.1.38"
+version = "0.1.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf9cf6a813d3f40c88b0b6b6f29a5c95c6cdbf97c1f9cc53fb820200f5ad814d"
+checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
 dependencies = [
+ "cfg-if",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
@@ -1334,7 +1335,7 @@ checksum = "0f57e3ca2a01450b1a921183a9c9cbfda207fd822cef4ccb00a65402cbba7a74"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1725,9 +1726,9 @@ checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
 name = "winnow"
-version = "0.4.1"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8970b36c66498d8ff1d66685dc86b91b29db0c7739899012f63a63814b4b28"
+checksum = "5617da7e1f97bf363947d767b91aaf3c2bbc19db7fda9c65af1278713d58e0a2"
 dependencies = [
  "memchr",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 8a7f57e..b03203c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,14 +16,14 @@ members = [
 	homepage   = "https://substrate-minimal.hack.ink"
 	license    = "GPL-3.0"
 	repository = "https://github.com/hack-ink/substrate-minimal"
-	version    = "0.10.0"
+	version    = "0.10.1"
 
 	[workspace.dependencies]
 	# crates.io
 	array-bytes        = { version = "6.1" }
 	fxhash             = { version = "0.2" }
 	once_cell          = { version = "1.17" }
-	parity-scale-codec = { version = "3.4" }
+	parity-scale-codec = { version = "3.5" }
 	reqwest            = { version = "0.11" }
 	scale-info         = { version = "2.6" }
 	serde              = { version = "1.0" }
diff --git a/subcryptor/src/test.rs b/subcryptor/src/test.rs
index 5488392..18cfcd9 100644
--- a/subcryptor/src/test.rs
+++ b/subcryptor/src/test.rs
@@ -1,5 +1,5 @@
 // substrate-minimal
-use super::*;
+use crate::*;
 
 const PUBLIC_KEY: &[u8] = &[
 	180, 247, 240, 59, 235, 197, 110, 190, 150, 188, 82, 234, 94, 211, 21, 157, 69, 160, 206, 58,
diff --git a/subhasher/Cargo.toml b/subhasher/Cargo.toml
index d4c609d..38ae498 100644
--- a/subhasher/Cargo.toml
+++ b/subhasher/Cargo.toml
@@ -9,17 +9,9 @@ readme               = "README.md"
 repository.workspace = true
 version.workspace    = true
 
-[dependencies]
-# crates.io
-blake2-rfc  = { version = "0.2", default-features = false }
-byteorder   = { version = "1.4", default-features = false }
-sha2        = { version = "0.10", default-features = false }
-tiny-keccak = { version = "2.0", features = ["keccak"] }
-twox-hash   = { version = "1.6", default-features = false }
-
 [features]
 default = [
-	# hack-ink
+	# substrate-minimal
 	"std",
 ]
 std = [
@@ -29,3 +21,12 @@ std = [
 	"sha2/std",
 	"twox-hash/std",
 ]
+
+
+[dependencies]
+# crates.io
+blake2-rfc  = { version = "0.2", default-features = false }
+byteorder   = { version = "1.4", default-features = false }
+sha2        = { version = "0.10", default-features = false }
+tiny-keccak = { version = "2.0", features = ["keccak"] }
+twox-hash   = { version = "1.6", default-features = false }
diff --git a/subhasher/src/test.rs b/subhasher/src/test.rs
index 90eecd0..3c5e75c 100644
--- a/subhasher/src/test.rs
+++ b/subhasher/src/test.rs
@@ -1,5 +1,5 @@
 // substrate-minimal
-use super::*;
+use crate::*;
 
 const DATA: &[u8] = &[
 	180, 247, 240, 59, 235, 197, 110, 190, 150, 188, 82, 234, 94, 211, 21, 157, 69, 160, 206, 58,
diff --git a/subrpcer/Cargo.toml b/subrpcer/Cargo.toml
index 4ea3582..d6cf6c1 100644
--- a/subrpcer/Cargo.toml
+++ b/subrpcer/Cargo.toml
@@ -9,18 +9,12 @@ readme               = "README.md"
 repository.workspace = true
 version.workspace    = true
 
-[dependencies]
-# crates.io
-# TODO: https://github.com/dtolnay/paste/issues/72
-affix      = { version = "0.1" }
-once_cell  = { workspace = true, optional = true }
-reqwest    = { workspace = true, optional = true, features = ["json"] }
-serde      = { workspace = true }
-serde_json = { workspace = true }
-tracing    = { workspace = true, optional = true }
-ureq       = { version = "2.6", optional = true, features = ["json"] }
-
 [features]
+trace = [
+	# crates.io
+	"tracing",
+]
+
 reqwest-client = [
 	# crates.io
 	"once_cell",
@@ -30,3 +24,14 @@ ureq-client = [
 	# crates.io
 	"ureq",
 ]
+
+[dependencies]
+# crates.io
+# TODO: https://github.com/dtolnay/paste/issues/72
+affix      = { version = "0.1" }
+once_cell  = { workspace = true, optional = true }
+reqwest    = { workspace = true, optional = true, features = ["json"] }
+serde      = { workspace = true }
+serde_json = { workspace = true }
+tracing    = { workspace = true, optional = true }
+ureq       = { version = "2.6", optional = true, features = ["json"] }
diff --git a/subrpcer/src/lib.rs b/subrpcer/src/lib.rs
index 54ceae4..7188950 100644
--- a/subrpcer/src/lib.rs
+++ b/subrpcer/src/lib.rs
@@ -119,8 +119,11 @@ pub fn rpc(id: usize, method: &str, params: Value) -> Value {
 		"params": params
 	});
 
-	#[cfg(feature = "tracing")]
-	tracing::trace!("Rpc({:?})", serde_json::to_string(&rpc).unwrap());
+	// This must not fail.
+	//
+	// `unwrap_or_default` is useless actually.
+	#[cfg(feature = "trace")]
+	tracing::trace!("Rpc({:?})", serde_json::to_string(&rpc).unwrap_or_default());
 
 	rpc
 }
diff --git a/substorager/Cargo.toml b/substorager/Cargo.toml
index 56a1ae8..cadefe3 100644
--- a/substorager/Cargo.toml
+++ b/substorager/Cargo.toml
@@ -9,15 +9,15 @@ readme               = "README.md"
 repository.workspace = true
 version.workspace    = true
 
+[features]
+codec = [
+	# crates.io
+	"parity-scale-codec",
+]
+
 [dependencies]
 # crates.io
 array-bytes        = { workspace = true }
 parity-scale-codec = { workspace = true, optional = true, features = ["derive"] }
 # hack-ink
 subhasher = { workspace = true }
-
-[features]
-codec = [
-	# crates.io
-	"parity-scale-codec",
-]
diff --git a/substorager/src/lib.rs b/substorager/src/lib.rs
index 2cadd53..9f8dc31 100644
--- a/substorager/src/lib.rs
+++ b/substorager/src/lib.rs
@@ -48,13 +48,13 @@ impl From<Vec<u8>> for StorageKey {
 	}
 }
 impl<const N: usize> From<[u8; N]> for StorageKey {
-	fn from(a: [u8; N]) -> Self {
-		Self(a.to_vec())
+	fn from(v: [u8; N]) -> Self {
+		Self(v.to_vec())
 	}
 }
 impl From<&[u8]> for StorageKey {
-	fn from(a: &[u8]) -> Self {
-		Self(a.to_vec())
+	fn from(v: &[u8]) -> Self {
+		Self(v.to_vec())
 	}
 }
 
diff --git a/substorager/src/test.rs b/substorager/src/test.rs
index 414b026..34c9937 100644
--- a/substorager/src/test.rs
+++ b/substorager/src/test.rs
@@ -1,5 +1,5 @@
 // substrate-minimal
-use super::*;
+use crate::*;
 
 #[test]
 fn storage_key_should_work() {