update changelog

CHANGELOG.md

@@ -3,6 +3,11 @@
 ## v4.2.1
 
 July 3, 2024
+<!--
+    Add a summary for the release here.
+
+    If you don't change this message, or if this file is empty, the release
+    will not be created. -->
 
 ### BUG FIXES
 
@@ -16,6 +21,58 @@ July 3, 2024
   - Add missing check for the minimum height of evidence in the consumer double-vote handler.
     [#2008](https://github.com/cosmos/interchain-security/pull/2008)
 
+## v4.2.0
+
+May 1, 2024
+
+### API BREAKING
+
+- [Provider](x/ccv/provider)
+  - Assigning a key that is already assigned by the same validator will now be a no-op instead of throwing an error.
+    ([\#1732](https://github.com/cosmos/interchain-security/pull/1732))
+  - Changes the `list-consumer-chains` query to include a `min_power_in_top_N` field, as well as fields for all power shaping parameters of the consumer.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1863))
+
+### DEPENDENCIES
+
+- Bump [CometBFT](https://github.com/cometbft/cometbft) to
+  [v0.37.6](https://github.com/cometbft/cometbft/releases/tag/v0.37.6).
+  ([\#1876](https://github.com/cosmos/interchain-security/pull/1876))
+- Bump [cosmos-sdk](https://github.com/cosmos/cosmos-sdk) to
+  [v0.47.11](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.11).
+  ([\#1876](https://github.com/cosmos/interchain-security/pull/1876))
+
+### FEATURES
+
+- [Provider](x/ccv/provider)
+  - Enable Opt In and Top N chains through gov proposals.
+    ([\#1587](https://github.com/cosmos/interchain-security/pull/1587))
+  - Adding the Partial Set Security (PSS) feature cf. [ADR 015](https://cosmos.github.io/interchain-security/adrs/adr-015-partial-set-security).
+    PSS enables consumer chains to join ICS as _Top N_ or _Opt In_ chains and enables validators to opt to validate the consumer chains they want.
+    ([\#1809](https://github.com/cosmos/interchain-security/pull/1809))
+  - Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+    ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))
+  - Bump cosmos-sdk to v0.47.13-ics-lsm (uses pinned golang.org/x/exp).
+    ([\#1851](https://github.com/cosmos/interchain-security/pull/1851))
+  - Changes the `list-consumer-chains` query to include a `min_power_in_top_N` field, as well as fields for all power shaping parameters of the consumer.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1863))
+  - Introduces the `consumer-validators` query to retrieve the latest set consumer-validator set for a consumer chain.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1867))
+
+### STATE BREAKING
+
+- [Provider](x/ccv/provider)
+  - Enable Opt In and Top N chains through gov proposals.
+    ([\#1587](https://github.com/cosmos/interchain-security/pull/1587))
+  - Assigning a key that is already assigned by the same validator will now be a no-op instead of throwing an error.
+    ([\#1732](https://github.com/cosmos/interchain-security/pull/1732))
+  - Adding the Partial Set Security feature cf. [ADR 015](https://cosmos.github.io/interchain-security/adrs/adr-015-partial-set-security).
+    ([\#1809](https://github.com/cosmos/interchain-security/pull/1809))
+  - Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+    ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))
+  - Bump cosmos-sdk to v0.47.13-ics-lsm (uses pinned golang.org/x/exp).
+    ([\#1851](https://github.com/cosmos/interchain-security/pull/1851))
+
 ## Previous Versions
 
 [CHANGELOG of previous versions](https://github.com/cosmos/interchain-security/blob/main/CHANGELOG.md)