diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43ea1dc..8f7a0c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 - [BREAKING] Increment minimum supported Rust version to 1.84.
 
+## 0.13.2 (2025-01-24)
+
+- Made `InnerNode` and `NodeMutation` public. Implemented (de)serialization of `LeafIndex` (#367).
+
+
 ## 0.13.1 (2024-12-26)
 
 - Generate reverse mutations set on applying of mutations set, implemented serialization of `MutationsSet` (#355).
diff --git a/src/merkle/mod.rs b/src/merkle/mod.rs
index 2fdbc6b..95a404d 100644
--- a/src/merkle/mod.rs
+++ b/src/merkle/mod.rs
@@ -24,8 +24,8 @@ mod smt;
 #[cfg(feature = "internal")]
 pub use smt::build_subtree_for_bench;
 pub use smt::{
-    LeafIndex, MutationSet, SimpleSmt, Smt, SmtLeaf, SmtLeafError, SmtProof, SmtProofError,
-    SubtreeLeaf, SMT_DEPTH, SMT_MAX_DEPTH, SMT_MIN_DEPTH,
+    InnerNode, LeafIndex, MutationSet, NodeMutation, SimpleSmt, Smt, SmtLeaf, SmtLeafError,
+    SmtProof, SmtProofError, SubtreeLeaf, SMT_DEPTH, SMT_MAX_DEPTH, SMT_MIN_DEPTH,
 };
 
 mod mmr;
diff --git a/src/merkle/smt/mod.rs b/src/merkle/smt/mod.rs
index ec43957..ffa60a2 100644
--- a/src/merkle/smt/mod.rs
+++ b/src/merkle/smt/mod.rs
@@ -643,17 +643,29 @@ impl<const DEPTH: u8> TryFrom<NodeIndex> for LeafIndex<DEPTH> {
     }
 }
 
+impl<const DEPTH: u8> Serializable for LeafIndex<DEPTH> {
+    fn write_into<W: ByteWriter>(&self, target: &mut W) {
+        self.index.write_into(target);
+    }
+}
+
+impl<const DEPTH: u8> Deserializable for LeafIndex<DEPTH> {
+    fn read_from<R: ByteReader>(source: &mut R) -> Result<Self, DeserializationError> {
+        Ok(Self { index: source.read()? })
+    }
+}
+
 // MUTATIONS
 // ================================================================================================
 
-/// A change to an inner node of a [`SparseMerkleTree`] that hasn't yet been applied.
+/// A change to an inner node of a sparse Merkle tree that hasn't yet been applied.
 /// [`MutationSet`] stores this type in relation to a [`NodeIndex`] to keep track of what changes
 /// need to occur at which node indices.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum NodeMutation {
-    /// Corresponds to [`SparseMerkleTree::remove_inner_node()`].
+    /// Node needs to be removed.
     Removal,
-    /// Corresponds to [`SparseMerkleTree::insert_inner_node()`].
+    /// Node needs to be inserted.
     Addition(InnerNode),
 }