diff --git a/.bumpversion.toml b/.bumpversion.toml
index ce52b1d..22646ba 100644
--- a/.bumpversion.toml
+++ b/.bumpversion.toml
@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "v0.8.1"
+current_version = "v0.9.0"
 commit = true
 commit_args = "--no-verify"
 tag = true
diff --git a/README.md b/README.md
index b756bc1..3f246cd 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # invrs-opt - Optimization algorithms for inverse design
-`v0.8.1`
+`v0.9.0`
 
 ## Overview
 
diff --git a/pyproject.toml b/pyproject.toml
index a37510e..fc11c11 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 
 name = "invrs_opt"
-version = "v0.8.1"
+version = "v0.9.0"
 description = "Algorithms for inverse design"
 keywords = ["topology", "optimization", "jax", "inverse design"]
 readme = "README.md"
diff --git a/src/invrs_opt/__init__.py b/src/invrs_opt/__init__.py
index 0d1a2a2..817dde5 100644
--- a/src/invrs_opt/__init__.py
+++ b/src/invrs_opt/__init__.py
@@ -3,7 +3,7 @@
 Copyright (c) 2023 The INVRS-IO authors.
 """
 
-__version__ = "v0.8.1"
+__version__ = "v0.9.0"
 __author__ = "Martin F. Schubert <mfschubert@gmail.com>"
 
 from invrs_opt import parameterization as parameterization