diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index d261165..bf7dca0 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -7,10 +7,9 @@ name: Docker
 
 on:
   pull_request:
-    branches: [ "main" ]
-  
+    branches: ["main"]
   release:
-    types: [ published ]
+    types: [published]
 
 env:
   # Use docker.io for Docker Hub if empty
@@ -18,10 +17,8 @@ env:
   # github.repository as <account>/<repo>
   IMAGE_NAME: ${{ github.repository }}
 
-
 jobs:
   build:
-
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -32,12 +29,12 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Enable QEMU for cross-platform builds
       # https://github.com/docker/setup-qemu-action
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       # Install the cosign tool except on PR
       # https://github.com/sigstore/cosign-installer
@@ -45,7 +42,7 @@ jobs:
         if: github.event_name != 'pull_request'
         uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
         with:
-          cosign-release: 'v2.2.4'
+          cosign-release: "v2.2.4"
 
       # Set up BuildKit Docker container builder to be able to build
       # multi-platform images and export cache
diff --git a/.github/workflows/python-build-package.yml b/.github/workflows/python-build-package.yml
new file mode 100644
index 0000000..bdda51b
--- /dev/null
+++ b/.github/workflows/python-build-package.yml
@@ -0,0 +1,37 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Test Python Build
+
+on:
+  pull_request:
+    branches: ["main"]
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
+
+    steps:
+      - uses: actions/checkout@v6
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8 pytest
+          python -m pip install . --no-cache-dir
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index 3b0cb0e..4c12bcf 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -20,9 +20,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.x"
 
diff --git a/README.md b/README.md
index ff089d4..95eb066 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 # Backsub - pixel-by-pixel channel subtraction tool for multiplexed immunofluorescence data
+[![PyPI](https://img.shields.io/pypi/v/backsub?style=flat-square)](https://pypi.org/project/backsub/)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/backsub?style=flat-square)](https://pypi.org/project/backsub/)
+[![PyPI - License](https://img.shields.io/pypi/l/backsub?style=flat-square)](https://pypi.org/project/backsub/)
+[![PyPI - Downloads](https://img.shields.io/pypi/dm/backsub?style=flat-square)](https://pypi.org/project/backsub/)
 
 Backsub performs pixel-by-pixel background subtraction between marker and background channels scaled by their respective exposure times. The outputs are saved as pyramidal OME-TIFF files. It was originally developed for data produced by the Lunaphore COMET platform and is fully compatible with the [MCMICRO](https://mcmicro.org) pipeline.
 
@@ -23,7 +27,8 @@ Marker_corrected = Marker_raw − Background × (Exposure_Marker / Exposure_Back
 
 ## Installation
 
-Backsub can be installed directly from PyPI, or run in a preconfigured Docker container. For development or container builds, a fixed-version Conda environment is provided.
+Backsub can be installed directly from PyPI, or run in a preconfigured Docker container. For development or container builds, a fixed-version Conda environment is provided.  
+Backsub requires Python >=3.11
 
 ### Option 1: Install from PyPI
 
diff --git a/pyproject.toml b/pyproject.toml
index 1d17be8..623b77d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,15 +3,21 @@ name = "backsub"
 dynamic = ["version"]
 description = "Channel subtraction scaled by exposure times"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.11"
 license = { file = "LICENSE" }
 authors = [
     { name="Krešimir Bestak", email="kbestak@gmail.com" }
 ]
 keywords = ["autofluorescence", "imaging", "immunofluorescence", "subtraction"]
 classifiers = [
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Operating System :: POSIX :: Linux",
+    "Operating System :: MacOS",
+    "Operating System :: Microsoft :: Windows",
     "Intended Audience :: Science/Research",
-    "Programming Language :: Python :: 3",
     "License :: OSI Approved :: MIT License"
 ]
 dependencies = [