diff --git a/.changelog/unreleased/improvements/996-custom-chain-id-deserialization.md b/.changelog/unreleased/improvements/996-custom-chain-id-deserialization.md
new file mode 100644
index 000000000..ad7a29ac4
--- /dev/null
+++ b/.changelog/unreleased/improvements/996-custom-chain-id-deserialization.md
@@ -0,0 +1 @@
+- `[ibc-core]` Implement custom JSON and Borsh deserialization for `ChainId` ([#996](https://github.com/cosmos/ibc-rs/pull/1013))
\ No newline at end of file
diff --git a/ibc-core/ics24-host/types/src/identifiers/chain_id.rs b/ibc-core/ics24-host/types/src/identifiers/chain_id.rs
index 1d3c5cdb5..4683ae5c4 100644
--- a/ibc-core/ics24-host/types/src/identifiers/chain_id.rs
+++ b/ibc-core/ics24-host/types/src/identifiers/chain_id.rs
@@ -3,7 +3,7 @@ use crate::validate::{
     validate_identifier_chars, validate_identifier_length, validate_prefix_length,
 };
 
-use core::fmt::{Debug, Display, Error as FmtError, Formatter};
+use core::fmt::{self, Debug, Display, Error as FmtError, Formatter};
 use core::str::FromStr;
 
 use ibc_primitives::prelude::*;