diff --git a/Cargo.lock b/Cargo.lock
index a935be0..111b6f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1744,7 +1744,7 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "sumup"
-version = "0.5.5"
+version = "0.5.6"
 dependencies = [
  "axum",
  "axum-extra",
diff --git a/sdk/CHANGELOG.md b/sdk/CHANGELOG.md
index 9c20f83..fbc9c00 100644
--- a/sdk/CHANGELOG.md
+++ b/sdk/CHANGELOG.md
@@ -5,6 +5,23 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.6](https://github.com/sumup/sumup-rs/compare/v0.5.5...v0.5.6) - 2026-01-20
+
+### Added
+
+- report runtime info ([#87](https://github.com/sumup/sumup-rs/pull/87))
+- *(sdk)* improve struct names ([#79](https://github.com/sumup/sumup-rs/pull/79))
+- *(sdk)* mark deprecated tags (resources) as such ([#27](https://github.com/sumup/sumup-rs/pull/27))
+- *(sdk)* reader status battery_level type
+- *(sdk)* support nullable values ([#69](https://github.com/sumup/sumup-rs/pull/69))
+
+### Other
+
+- synced file(s) with sumup/apis ([#86](https://github.com/sumup/sumup-rs/pull/86))
+- synced file(s) with sumup/apis ([#77](https://github.com/sumup/sumup-rs/pull/77))
+- *(deps)* bump axum-extra from 0.12.2 to 0.12.5 ([#78](https://github.com/sumup/sumup-rs/pull/78))
+- *(deps)* bump axum from 0.8.7 to 0.8.8 ([#72](https://github.com/sumup/sumup-rs/pull/72))
+
 ## [0.5.5](https://github.com/sumup/sumup-rs/compare/v0.5.4...v0.5.5) - 2025-12-19
 
 ### Added
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
index 16d1bcc..8fe4ac0 100644
--- a/sdk/Cargo.toml
+++ b/sdk/Cargo.toml
@@ -2,7 +2,7 @@
 name = "sumup"
 description = "Rust SDK for the SumUp API."
 documentation = "https://docs.rs/sumup"
-version = "0.5.5"
+version = "0.5.6"
 edition = "2021"
 rust-version = "1.82"
 readme = "../README.md"