diff --git a/Cargo.toml b/Cargo.toml
index bb9fac368..fcd164017 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,4 @@
 [workspace]
-resolver = "2"
 members = [
 	"fixed-hash",
 	"keccak-hash",
diff --git a/ethbloom/CHANGELOG.md b/ethbloom/CHANGELOG.md
index ff59062ac..0466d6c53 100644
--- a/ethbloom/CHANGELOG.md
+++ b/ethbloom/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.11.1] - 2021-09-30
 - Combined `scale-info` feature into `codec`. [#593](https://github.com/paritytech/parity-common/pull/593)
diff --git a/ethbloom/Cargo.toml b/ethbloom/Cargo.toml
index f096d49c2..65f1af299 100644
--- a/ethbloom/Cargo.toml
+++ b/ethbloom/Cargo.toml
@@ -7,7 +7,8 @@ license = "MIT OR Apache-2.0"
 documentation = "https://docs.rs/ethbloom"
 homepage = "https://github.com/paritytech/parity-common"
 repository = "https://github.com/paritytech/parity-common"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 tiny-keccak = { version = "2.0", features = ["keccak"] }
diff --git a/ethereum-types/CHANGELOG.md b/ethereum-types/CHANGELOG.md
index 3bcdf7106..7c9fbcfc1 100644
--- a/ethereum-types/CHANGELOG.md
+++ b/ethereum-types/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.12.1] - 2021-09-30
 - Combined `scale-info` feature into `codec`. [#593](https://github.com/paritytech/parity-common/pull/593)
diff --git a/ethereum-types/Cargo.toml b/ethereum-types/Cargo.toml
index 3bda0e485..06869767c 100644
--- a/ethereum-types/Cargo.toml
+++ b/ethereum-types/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "Ethereum types"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 ethbloom = { path = "../ethbloom", version = "0.11", default-features = false }
diff --git a/fixed-hash/CHANGELOG.md b/fixed-hash/CHANGELOG.md
index b74c4b3e4..8fe709b9f 100644
--- a/fixed-hash/CHANGELOG.md
+++ b/fixed-hash/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.7.0] - 2021-01-05
 ### Breaking
diff --git a/fixed-hash/Cargo.toml b/fixed-hash/Cargo.toml
index 99419c582..27ad7d217 100644
--- a/fixed-hash/Cargo.toml
+++ b/fixed-hash/Cargo.toml
@@ -8,7 +8,8 @@ repository = "https://github.com/paritytech/parity-common"
 description = "Macros to define custom fixed-size hash types"
 documentation = "https://docs.rs/fixed-hash/"
 readme = "README.md"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [package.metadata.docs.rs]
 features = ["quickcheck", "api-dummy"]
diff --git a/keccak-hash/CHANGELOG.md b/keccak-hash/CHANGELOG.md
index 455ca717b..15eb38aa5 100644
--- a/keccak-hash/CHANGELOG.md
+++ b/keccak-hash/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ### Breaking
 - Updated `primitive-types` to 0.10. [#556](https://github.com/paritytech/parity-common/pull/556)
diff --git a/keccak-hash/Cargo.toml b/keccak-hash/Cargo.toml
index d48ef763e..9979285b2 100644
--- a/keccak-hash/Cargo.toml
+++ b/keccak-hash/Cargo.toml
@@ -6,7 +6,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 readme = "README.md"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 tiny-keccak = { version = "2.0", features = ["keccak"] }
diff --git a/kvdb-memorydb/CHANGELOG.md b/kvdb-memorydb/CHANGELOG.md
index e9f497217..399ca6cd8 100644
--- a/kvdb-memorydb/CHANGELOG.md
+++ b/kvdb-memorydb/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ### Breaking
 - Updated `parity-util-mem` to 0.10. [#556](https://github.com/paritytech/parity-common/pull/556)
diff --git a/kvdb-memorydb/Cargo.toml b/kvdb-memorydb/Cargo.toml
index c60c48432..29d4cfa6f 100644
--- a/kvdb-memorydb/Cargo.toml
+++ b/kvdb-memorydb/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 description = "A key-value in-memory database that implements the  `KeyValueDB` trait"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 parity-util-mem = { path = "../parity-util-mem", version = "0.10", default-features = false, features = ["std"] }
diff --git a/kvdb-rocksdb/CHANGELOG.md b/kvdb-rocksdb/CHANGELOG.md
index 195922bea..11ea4cb84 100644
--- a/kvdb-rocksdb/CHANGELOG.md
+++ b/kvdb-rocksdb/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.14.0] - 2021-08-05
 ### Breaking
diff --git a/kvdb-rocksdb/Cargo.toml b/kvdb-rocksdb/Cargo.toml
index 9734453e9..45c2eab7c 100644
--- a/kvdb-rocksdb/Cargo.toml
+++ b/kvdb-rocksdb/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 description = "kvdb implementation backed by RocksDB"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [[bench]]
 name = "bench_read_perf"
diff --git a/kvdb-shared-tests/CHANGELOG.md b/kvdb-shared-tests/CHANGELOG.md
index 17f7b2501..197bfd68f 100644
--- a/kvdb-shared-tests/CHANGELOG.md
+++ b/kvdb-shared-tests/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ### Breaking
 - Updated `kvdb` to 0.10. [#556](https://github.com/paritytech/parity-common/pull/556)
diff --git a/kvdb-shared-tests/Cargo.toml b/kvdb-shared-tests/Cargo.toml
index 356b44766..e63c43370 100644
--- a/kvdb-shared-tests/Cargo.toml
+++ b/kvdb-shared-tests/Cargo.toml
@@ -2,7 +2,8 @@
 name = "kvdb-shared-tests"
 version = "0.8.0"
 authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 description = "Shared tests for kvdb functionality, to be executed against actual implementations"
 license = "MIT OR Apache-2.0"
 
diff --git a/kvdb/CHANGELOG.md b/kvdb/CHANGELOG.md
index 15b66dee7..6ab16be2e 100644
--- a/kvdb/CHANGELOG.md
+++ b/kvdb/CHANGELOG.md
@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog].
 
 ### Breaking
 - Updated `parity-util-mem` to 0.10. [#556](https://github.com/paritytech/parity-common/pull/556)
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.9.0] - 2021-01-27
 ### Breaking
diff --git a/kvdb/Cargo.toml b/kvdb/Cargo.toml
index 66d8a18b6..348761b4f 100644
--- a/kvdb/Cargo.toml
+++ b/kvdb/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 description = "Generic key-value trait"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 smallvec = "1.0.0"
diff --git a/parity-bytes/CHANGELOG.md b/parity-bytes/CHANGELOG.md
index 49b2d0857..a3c092d58 100644
--- a/parity-bytes/CHANGELOG.md
+++ b/parity-bytes/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.1.2] - 2020-03-16
 - License changed from GPL3 to dual MIT/Apache2. [#342](https://github.com/paritytech/parity-common/pull/342)
diff --git a/parity-bytes/Cargo.toml b/parity-bytes/Cargo.toml
index 651369f1c..6d745aca3 100644
--- a/parity-bytes/Cargo.toml
+++ b/parity-bytes/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 description = "byte utilities for Parity"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 
diff --git a/parity-util-mem/CHANGELOG.md b/parity-util-mem/CHANGELOG.md
index 3de621c77..de095aad0 100644
--- a/parity-util-mem/CHANGELOG.md
+++ b/parity-util-mem/CHANGELOG.md
@@ -4,6 +4,9 @@ The format is based on [Keep a Changelog].
 
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
+## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
+
 ## [0.10.2] - 2021-09-20
 - Switched from `jemallocator` to `tikv-jemallocator`. [#589](https://github.com/paritytech/parity-common/pull/589)
 
diff --git a/parity-util-mem/Cargo.toml b/parity-util-mem/Cargo.toml
index 6515cf8fb..af9b7e840 100644
--- a/parity-util-mem/Cargo.toml
+++ b/parity-util-mem/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 repository = "https://github.com/paritytech/parity-common"
 description = "Collection of memory related utilities"
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 # Prevent multiple versions from being linked into the same program.
 links = "parity-util-mem-ban-duplicates"
diff --git a/parity-util-mem/derive/CHANGELOG.md b/parity-util-mem/derive/CHANGELOG.md
index 545cf7dff..c9a41d07a 100644
--- a/parity-util-mem/derive/CHANGELOG.md
+++ b/parity-util-mem/derive/CHANGELOG.md
@@ -5,3 +5,4 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
diff --git a/parity-util-mem/derive/Cargo.toml b/parity-util-mem/derive/Cargo.toml
index d41ba12f5..02d6a9d71 100644
--- a/parity-util-mem/derive/Cargo.toml
+++ b/parity-util-mem/derive/Cargo.toml
@@ -5,6 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 description = "Crate for memory reporting"
 repository = "https://github.com/paritytech/pariry-common/parity-util-mem/derive"
+edition = "2021"
+rust-version = "1.56.1"
 
 [lib]
 path = "lib.rs"
diff --git a/primitive-types/CHANGELOG.md b/primitive-types/CHANGELOG.md
index 39c1a4e52..a7c1da6b6 100644
--- a/primitive-types/CHANGELOG.md
+++ b/primitive-types/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.10.1] - 2021-07-02
 ### Added
diff --git a/primitive-types/Cargo.toml b/primitive-types/Cargo.toml
index 7a0b9d9e5..de3732646 100644
--- a/primitive-types/Cargo.toml
+++ b/primitive-types/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "Primitive types shared by Ethereum and Substrate"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 fixed-hash = { version = "0.7", path = "../fixed-hash", default-features = false }
diff --git a/primitive-types/impls/codec/CHANGELOG.md b/primitive-types/impls/codec/CHANGELOG.md
index c7fca7d25..63cf2acca 100644
--- a/primitive-types/impls/codec/CHANGELOG.md
+++ b/primitive-types/impls/codec/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.5.1] - 2021-07-02
 ### Dependencies
diff --git a/primitive-types/impls/codec/Cargo.toml b/primitive-types/impls/codec/Cargo.toml
index 8721e4333..0e83d4c21 100644
--- a/primitive-types/impls/codec/Cargo.toml
+++ b/primitive-types/impls/codec/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "Parity Codec serialization support for uint and fixed hash."
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 parity-scale-codec = { version = "2.2.0", default-features = false, features = ["max-encoded-len"] }
diff --git a/primitive-types/impls/num-traits/CHANGELOG.md b/primitive-types/impls/num-traits/CHANGELOG.md
index e0b657b7d..0cec2af8f 100644
--- a/primitive-types/impls/num-traits/CHANGELOG.md
+++ b/primitive-types/impls/num-traits/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.1.1] - 2021-06-30
 - Added `integer-sqrt` trait support. [#554](https://github.com/paritytech/parity-common/pull/554)
diff --git a/primitive-types/impls/num-traits/Cargo.toml b/primitive-types/impls/num-traits/Cargo.toml
index 27a8fc82a..bbcd3f02f 100644
--- a/primitive-types/impls/num-traits/Cargo.toml
+++ b/primitive-types/impls/num-traits/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "num-traits implementation for uint."
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 num-traits = { version = "0.2", default-features = false }
diff --git a/primitive-types/impls/rlp/CHANGELOG.md b/primitive-types/impls/rlp/CHANGELOG.md
index 749b49f37..a7a98544b 100644
--- a/primitive-types/impls/rlp/CHANGELOG.md
+++ b/primitive-types/impls/rlp/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.3.0] - 2021-01-05
 ### Breaking
diff --git a/primitive-types/impls/rlp/Cargo.toml b/primitive-types/impls/rlp/Cargo.toml
index 622aa0f37..e85d68e43 100644
--- a/primitive-types/impls/rlp/Cargo.toml
+++ b/primitive-types/impls/rlp/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "RLP serialization support for uint and fixed hash."
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 rlp = { version = "0.5", path = "../../../rlp", default-features = false }
diff --git a/primitive-types/impls/serde/CHANGELOG.md b/primitive-types/impls/serde/CHANGELOG.md
index 390cc1581..5d143f916 100644
--- a/primitive-types/impls/serde/CHANGELOG.md
+++ b/primitive-types/impls/serde/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.3.2] - 2021-11-10
 - Supported decoding of hex strings without `0x` prefix. [#598](https://github.com/paritytech/parity-common/pull/598)
diff --git a/primitive-types/impls/serde/Cargo.toml b/primitive-types/impls/serde/Cargo.toml
index 28c1ae9d5..f94c754ac 100644
--- a/primitive-types/impls/serde/Cargo.toml
+++ b/primitive-types/impls/serde/Cargo.toml
@@ -2,10 +2,11 @@
 name = "impl-serde"
 version = "0.3.2"
 authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/paritytech/parity-common"
 description = "Serde serialization support for uint and fixed hash."
+edition = "2021"
+rust-version = "1.56.1"
 
 [features]
 default = ["std"]
diff --git a/rlp-derive/CHANGELOG.md b/rlp-derive/CHANGELOG.md
index d7b344b76..85516d84b 100644
--- a/rlp-derive/CHANGELOG.md
+++ b/rlp-derive/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.1.0] - 2020-02-13
 - Extracted from parity-ethereum repo. [#343](https://github.com/paritytech/parity-common/pull/343)
diff --git a/rlp-derive/Cargo.toml b/rlp-derive/Cargo.toml
index 16f7e010e..a1785d7b7 100644
--- a/rlp-derive/Cargo.toml
+++ b/rlp-derive/Cargo.toml
@@ -5,7 +5,8 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT OR Apache-2.0"
 description = "Derive macro for #[derive(RlpEncodable, RlpDecodable)]"
 homepage = "http://parity.io"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [lib]
 proc-macro = true
diff --git a/rlp/CHANGELOG.md b/rlp/CHANGELOG.md
index cf4695203..dedfeef65 100644
--- a/rlp/CHANGELOG.md
+++ b/rlp/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.5.1] - 2021-07-30
 - Fix rlp encoding/decoding for bool. [#572](https://github.com/paritytech/parity-common/pull/572)
diff --git a/rlp/Cargo.toml b/rlp/Cargo.toml
index 6f346b5ea..f649a7eed 100644
--- a/rlp/Cargo.toml
+++ b/rlp/Cargo.toml
@@ -5,7 +5,8 @@ description = "Recursive-length prefix encoding, decoding, and compression"
 repository = "https://github.com/paritytech/parity-common"
 license = "MIT OR Apache-2.0"
 authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 bytes = { version = "1", default-features = false }
diff --git a/uint/CHANGELOG.md b/uint/CHANGELOG.md
index 73456b577..a5d14c05b 100644
--- a/uint/CHANGELOG.md
+++ b/uint/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Migrated to 2021 edition, enforcing MSRV of `1.56.1`. [#601](https://github.com/paritytech/parity-common/pull/601)
 
 ## [0.9.1] - 2021-06-30
 - Added `integer_sqrt` method. [#554](https://github.com/paritytech/parity-common/pull/554)
diff --git a/uint/Cargo.toml b/uint/Cargo.toml
index 1db8710be..5d6a52f21 100644
--- a/uint/Cargo.toml
+++ b/uint/Cargo.toml
@@ -7,7 +7,8 @@ name = "uint"
 version = "0.9.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 readme = "README.md"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [dependencies]
 byteorder = { version = "1.4.2", default-features = false }
diff --git a/uint/fuzz/Cargo.toml b/uint/fuzz/Cargo.toml
index b549817a5..78119034f 100644
--- a/uint/fuzz/Cargo.toml
+++ b/uint/fuzz/Cargo.toml
@@ -4,7 +4,8 @@ description = "Fuzzers for uint algorithms"
 publish = false
 version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
+edition = "2021"
+rust-version = "1.56.1"
 
 [package.metadata]
 cargo-fuzz = true