diff --git a/.github/workflows/run_pytests.yaml b/.github/workflows/run_pytests.yaml
index 36aafc3..a9dc736 100644
--- a/.github/workflows/run_pytests.yaml
+++ b/.github/workflows/run_pytests.yaml
@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
       - name: Prevent cache-miss on windows
         run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 013bffa..0aec2f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.1] - 2023-01-12
+
+### Fixed
+
+- Fixed missing support for Python 3.12.
+
 ## [0.12.0] - 2023-01-12
 
 ### Changed
diff --git a/poetry.lock b/poetry.lock
index 6b41189..6dcd614 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1488,5 +1488,5 @@ openslide = ["openslide-python"]
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.9, <3.12"
-content-hash = "23611928e4cb9ec199dfdd86266576b82b9cc1c9e98206f7c8dfe331fc8a0ccc"
+python-versions = "^3.9"
+content-hash = "9e8af66c87b755d9fa56089775b7063f4463a091ea2a6da43886e4c8983d6636"
diff --git a/pyproject.toml b/pyproject.toml
index 13c4aba..d97e22e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "wsidicomizer"
-version = "0.12.0"
+version = "0.12.1"
 description = "Tool for reading WSI files from proprietary formats and optionally convert them to to DICOM"
 authors = ["Erik O Gabrielsson <erik.o.gabrielsson@sectra.com>"]
 license = "Apache-2.0"
@@ -17,7 +17,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.9, <3.12"
+python = "^3.9"
 wsidicom = "^0.18.1"
 opentile = "^0.11.1"
 numpy = "^1.22.0"
diff --git a/wsidicomizer/__init__.py b/wsidicomizer/__init__.py
index 74dc556..d388e1b 100644
--- a/wsidicomizer/__init__.py
+++ b/wsidicomizer/__init__.py
@@ -14,4 +14,4 @@
 
 from wsidicomizer.wsidicomizer import WsiDicomizer
 
-__version__ = "0.12.0"
+__version__ = "0.12.1"