diff --git a/Cargo.lock b/Cargo.lock
index f77a153..7c68248 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1185,7 +1185,7 @@ dependencies = [
 
 [[package]]
 name = "quizx"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "approx",
  "assert_cmd",
diff --git a/pybindings/Cargo.toml b/pybindings/Cargo.toml
index a49d282..9eb92db 100644
--- a/pybindings/Cargo.toml
+++ b/pybindings/Cargo.toml
@@ -14,7 +14,7 @@ name = "libquizx"
 crate-type = ["cdylib"]
 
 [dependencies]
-quizx = { version = "0.3.0", path = "../quizx" }
+quizx = { version = "0.4.0", path = "../quizx" }
 num = { workspace = true }
 pyo3 = { workspace = true, features = [
     "extension-module",
diff --git a/quizx/CHANGELOG.md b/quizx/CHANGELOG.md
index f0efb8b..42ee23f 100644
--- a/quizx/CHANGELOG.md
+++ b/quizx/CHANGELOG.md
@@ -4,6 +4,23 @@ This is the changelog for the `quizx` rust library.
 For the changelog of the `quizx` python library, see the separate [`CHANGELOG.md`](https://github.com/zxcalc/quizx/blob/master/pybindings/CHANGELOG.md) file.
 
 
+## [0.4.0](https://github.com/quantinuum-dev/quizx/compare/quizx@v0.3.0...quizx@v0.4.0) - 2026-08-10
+
+### Bug Fixes
+
+- typo in README
+- bug in cutrank caching ([#173](https://github.com/quantinuum-dev/quizx/pull/173))
+- remove stale edges from rank cache
+- another caching bug in rankwidth
+
+### New Features
+
+- [**breaking**] Added dyadic rational type and new scalars based on this type ([#158](https://github.com/quantinuum-dev/quizx/pull/158))
+- use bitgauss library for fast F2 linear algebra ([#161](https://github.com/quantinuum-dev/quizx/pull/161))
+- [**breaking**] low-rankwidth decompositions of ZX diagrams ([#166](https://github.com/quantinuum-dev/quizx/pull/166))
+- [**breaking**] Python bindings for rankwidth functions ([#168](https://github.com/quantinuum-dev/quizx/pull/168))
+- added keyword args and properties to bindings ([#169](https://github.com/quantinuum-dev/quizx/pull/169))
+
 ## [0.3.0](https://github.com/zxcalc/quizx/compare/quizx@v0.2.0...quizx@v0.3.0) - 2025-06-12
 
 ### Bug Fixes
diff --git a/quizx/Cargo.toml b/quizx/Cargo.toml
index 8ccaac0..d4c8967 100644
--- a/quizx/Cargo.toml
+++ b/quizx/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "quizx"
-version = "0.3.0"
+version = "0.4.0"
 description = "Quantum Circuit Optimisation and Compilation using the ZX-calculus"
 keywords = ["Quantum", "ZX-calculus", "Optimisation", "Compilation"]
 categories = ["science"]