diff --git a/Cargo.lock b/Cargo.lock
index 7258b660d..801025ab8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2498,7 +2498,7 @@ dependencies = [
 
 [[package]]
 name = "tket-qsystem"
-version = "0.19.0"
+version = "0.20.0"
 dependencies = [
  "anyhow",
  "clap",
diff --git a/badger-optimiser/Cargo.toml b/badger-optimiser/Cargo.toml
index 1e5e457ee..034c66af8 100644
--- a/badger-optimiser/Cargo.toml
+++ b/badger-optimiser/Cargo.toml
@@ -16,7 +16,7 @@ tket = { path = "../tket", features = [
     "rewrite-tracing",
     "binary-eccs",
 ] }
-tket-qsystem = { path = "../tket-qsystem", version = "0.19.0" }
+tket-qsystem = { path = "../tket-qsystem", version = "0.20.0" }
 tracing = { workspace = true }
 tracing-subscriber = { workspace = true }
 tracing-appender = { workspace = true }
diff --git a/tket-py/Cargo.toml b/tket-py/Cargo.toml
index 959a537dd..7813cde47 100644
--- a/tket-py/Cargo.toml
+++ b/tket-py/Cargo.toml
@@ -23,7 +23,7 @@ tket = { path = "../tket", version = "0.14.0", features = [
     "portmatching",
     "binary-eccs",
 ] }
-tket-qsystem = { path = "../tket-qsystem", version = "0.19.0" }
+tket-qsystem = { path = "../tket-qsystem", version = "0.20.0" }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 tket-json-rs = { workspace = true, features = ["pyo3"] }
diff --git a/tket-qsystem/CHANGELOG.md b/tket-qsystem/CHANGELOG.md
index 6dd84848c..d44517678 100644
--- a/tket-qsystem/CHANGELOG.md
+++ b/tket-qsystem/CHANGELOG.md
@@ -1,6 +1,13 @@
 # Changelog
 
 
+## [0.20.0](https://github.com/CQCL/tket2/compare/tket-qsystem-v0.19.0...tket-qsystem-v0.20.0) - 2025-08-21
+
+### New Features
+
+- [**breaking**] Update WASM extension ([#1047](https://github.com/CQCL/tket2/pull/1047))
+- *(qsystem)* native gateset decomposition improvements ([#1059](https://github.com/CQCL/tket2/pull/1059))
+
 ## [0.19.0](https://github.com/CQCL/tket2/compare/tket-qsystem-v0.18.1...tket-qsystem-v0.19.0) - 2025-08-18
 
 ### New Features
diff --git a/tket-qsystem/Cargo.toml b/tket-qsystem/Cargo.toml
index 452efc0a9..9bfcff872 100644
--- a/tket-qsystem/Cargo.toml
+++ b/tket-qsystem/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tket-qsystem"
-version = "0.19.0"
+version = "0.20.0"
 edition.workspace = true
 rust-version.workspace = true