diff --git a/CHANGELOG.md b/CHANGELOG.md
index b77d7efcf3922..bbbbeee9c484f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+### Client-Breaking Changes
+
+* [\#9859](https://github.com/cosmos/cosmos-sdk/pull/9859) The `default` pruning strategy now keeps the last 362880 blocks instead of 100. 362880 equates to roughly enough blocks to cover the entire unbonding period assuming a 21 day unbonding period and 5s block time.
+
 ## [v0.43.0-rc3](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.43.0-rc3) - 2021-08-05
 
 ### Bug Fixes