diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2454a18850..724978871f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated `littlefs2` to 0.4.0.
 - Made `Request`, `Reply`, `Error`, `Context`, `CoreContext`, `Mechanism`,
   `ui::Status` non-exhaustive.
+- Made `postcard_deserialize`, `postcard_serialize` and
+  `postcard_serialize_bytes` private.
 
 ### Fixed
 
diff --git a/src/lib.rs b/src/lib.rs
index b45fc39a8f4..177dd376c01 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -48,11 +48,12 @@ pub use error::Error;
 pub use platform::Platform;
 pub use service::Service;
 
-pub use cbor_smol::{cbor_deserialize, cbor_serialize, cbor_serialize_bytes};
+pub use cbor_smol::{cbor_deserialize, cbor_serialize_bytes};
 pub use heapless_bytes::Bytes;
-pub use postcard::{from_bytes as postcard_deserialize, to_slice as postcard_serialize};
 
-pub fn postcard_serialize_bytes<T: serde::Serialize, const N: usize>(
+pub(crate) use postcard::from_bytes as postcard_deserialize;
+
+pub(crate) fn postcard_serialize_bytes<T: serde::Serialize, const N: usize>(
     object: &T,
 ) -> postcard::Result<Bytes<N>> {
     let vec = postcard::to_vec(object)?;