diff --git a/CHANGELOG.md b/CHANGELOG.md
index 822c30f52..f6802881c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,17 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.0.0](https://github.com/rust-bio/rust-htslib/compare/v0.51.0...v1.0.0) (2025-12-08)
+
+
+### ⚠ BREAKING CHANGES
+
+* Use Arc instead of Rc in bam::buffer, such that the buffer can be used in a multithreaded context ([#495](https://github.com/rust-bio/rust-htslib/issues/495))
+
+### Features
+
+* Use Arc instead of Rc in bam::buffer, such that the buffer can be used in a multithreaded context ([#495](https://github.com/rust-bio/rust-htslib/issues/495)) ([229d5a2](https://github.com/rust-bio/rust-htslib/commit/229d5a265685fd25e59e807524a5df27d4057c83))
+
 ## [0.51.0](https://github.com/rust-bio/rust-htslib/compare/v0.50.0...v0.51.0) (2025-10-15)
 
 
diff --git a/Cargo.toml b/Cargo.toml
index 288148129..9d84c51e3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ license = "MIT"
 name = "rust-htslib"
 readme = "README.md"
 repository = "https://github.com/rust-bio/rust-htslib.git"
-version = "0.51.0"
+version = "1.0.0"
 
 [package.metadata.release]
 pre-release-commit-message = "release version {{version}}"