diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cf8d50d..665d9895 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+# Unreleased
+
+## Rust
+
+## Full changes
+
+- chore(rust): update `prost` to v0.12 ([#202](https://github.com/cosmos/ics23/pull/202))
+
 # 0.10.2
 
 ## Rust
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 0edd7849..67364ebb 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -17,7 +17,7 @@ members = ["codegen", "no-std-check"]
 anyhow = {version = "1.0.40", default-features = false}
 bytes = {version = "1.0.1", default-features = false}
 hex = {version = "0.4.3", default-features = false, features = ["alloc"]}
-prost = {version = "0.11", default-features = false, features = ["prost-derive"]}
+prost = {version = "0.12", default-features = false, features = ["prost-derive"]}
 ripemd = {version = "0.1.1", optional = true, default-features = false}
 sha2 = {version = "0.10.2", optional = true, default-features = false}
 sha3 = {version = "0.10.2", optional = true, default-features = false}
diff --git a/rust/codegen/Cargo.toml b/rust/codegen/Cargo.toml
index f273f702..88737f2f 100644
--- a/rust/codegen/Cargo.toml
+++ b/rust/codegen/Cargo.toml
@@ -8,6 +8,6 @@ edition = "2018"
 
 [dependencies]
 bytes = "1.0.1"
-prost = "0.11"
+prost = "0.12"
 prost-build = "0.12"
 informalsystems-pbjson-build = "0.6.0"
diff --git a/rust/src/cosmos.ics23.v1.rs b/rust/src/cosmos.ics23.v1.rs
index a383fe73..d3c2226a 100644
--- a/rust/src/cosmos.ics23.v1.rs
+++ b/rust/src/cosmos.ics23.v1.rs
@@ -170,8 +170,8 @@ pub struct ProofSpec {
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct InnerSpec {
     /// Child order is the ordering of the children node, must count from 0
-    /// iavl tree is [0, 1] (left then right)
-    /// merk is [0, 2, 1] (left, right, here)
+    /// iavl tree is \[0, 1\] (left then right)
+    /// merk is \[0, 2, 1\] (left, right, here)
     #[prost(int32, repeated, tag = "1")]
     pub child_order: ::prost::alloc::vec::Vec<i32>,
     #[prost(int32, tag = "2")]