diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 48e499c..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-version: 2.1
-
-orbs:
-  python: circleci/python@2.0.3
-
-workflows:
-  pytest-all:
-    jobs:
-      - build-and-test
-
-jobs:
-  build-and-test:
-    resource_class: medium+
-    docker:
-      - image: jupyter/scipy-notebook:python-3.10
-    steps:
-      - checkout
-      - run:
-          name: Install tox
-          command: pip install tox==3.25.1
-      - run:
-          name: Run Tests
-          command: tox
\ No newline at end of file
diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
new file mode 100644
index 0000000..36db52c
--- /dev/null
+++ b/.github/workflows/ci_tests.yml
@@ -0,0 +1,64 @@
+# 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: ci_tests
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+  pull_request:
+
+jobs:
+  tests:
+    name: ${{ matrix.prefix }} ${{ matrix.os }}, ${{ matrix.tox_env }}
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.allow_failure }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            python: '3.10'
+            tox_env: 'py310-test-alldeps'
+            allow_failure: false
+            prefix: ''
+
+          - os: ubuntu-latest
+            python: '3.10'
+            tox_env: 'py310-test-astropy50'
+            allow_failure: false
+            prefix: ''
+
+          - os: ubuntu-latest
+            python: '3.10'
+            tox_env: 'py310-test-numpy122'
+            allow_failure: false
+            prefix: ''
+
+          - os: ubuntu-latest
+            python: '3.10'
+            tox_env: 'build_docs'
+            allow_failure: false
+            prefix: ''
+            
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Install Pandoc for build_docs
+      if: matrix.tox_env == 'build_docs'
+      run: sudo apt-get install -y pandoc
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tox
+    - name: Test with Tox
+      run: |
+        export PY_COLORS=1
+        tox -e ${{ matrix.tox_env }}
+      env:
+        PY_COLORS: '1'
diff --git a/README.rst b/README.rst
index 7f4f976..ef75b06 100644
--- a/README.rst
+++ b/README.rst
@@ -4,7 +4,7 @@
 
 PetroFit
 --------
-|circleci tag| |rtd tag| |PyPI tag|  |AJ tag| |astropy tag| |photutils tag|
+|rtd tag| |PyPI tag|  |AJ tag| |astropy tag| |photutils tag|
 
 PetroFit is a package for calculating Petrosian properties, such as radii and concentration indices, as well as fitting
 galaxy light profiles. In particular, PetroFit includes tools for performing accurate photometry, segmentations,
diff --git a/requirements.txt b/requirements.txt
index ba1de2b..417f34e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,13 +9,14 @@ notebook
 regions
 
 # Dependencies
-photutils>=1.1.0
+photutils==1.5.0
 ipywidgets
 
 # Docs
 sphinx
 docutils
 nbsphinx
+nbconvert
 
 # Other
 tox
diff --git a/tox.ini b/tox.ini
index 8cc8abf..7d5744f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,19 +1,22 @@
 [tox]
 envlist =
-    py{python3.10}-test{-alldeps}
-    py{python3.10}-test-numpy{122}
-    py{python3.10}-test-astropy{503}
+    py{310}-test{-alldeps}
+    py{310}-test-numpy{122}
+    py{310}-test-astropy{50}
     build_docs
     linkcheck
-#    codestyle # Disabled until cleanup
+
 requires =
     setuptools >= 61.0.0
     pip >= 22.0.0
+
 isolated_build = true
+
 indexserver =
     NIGHTLY = https://pypi.anaconda.org/scipy-wheels-nightly/simple
 
 [testenv]
+
 # Suppress display of matplotlib plots generated during docs build
 setenv = MPLBACKEND=agg
 
@@ -35,9 +38,6 @@ changedir = .tmp/{envname}
 description =
     run tests
     alldeps: with all optional dependencies
-    devdeps: with the latest developer version of key dependencies
-    oldestdeps: with the oldest supported version of key dependencies
-    cov: and test coverage
     numpy122: with numpy 1.22.*
     astropy50: with astropy 5.0.*
     astropylts: with the latest astropy LTS
@@ -45,14 +45,8 @@ description =
 # The following provides some specific pinnings for key packages
 deps =
     -r{toxinidir}/requirements.txt
-    cov: coverage
     numpy122: numpy==1.22.*
-
     astropy50: astropy==5.0.*
-    astropylts: astropy==5.0.*
-
-    devdeps: :NIGHTLY:numpy
-    devdeps: git+https://github.com/astropy/astropy.git#egg=astropy
 
 # The following indicates which extras_require from setup.cfg will be installed
 extras =
@@ -61,9 +55,7 @@ extras =
 
 commands =
     pip freeze
-    !cov: pytest --pyargs petrofit {toxinidir}/docs {posargs}
-    cov: pytest --pyargs petrofit {toxinidir}/docs --cov petrofit --cov-config={toxinidir}/setup.cfg {posargs}
-    cov: coverage xml -o {toxinidir}/coverage.xml
+    pytest --pyargs petrofit {toxinidir}/docs
 
 [testenv:build_docs]
 changedir = docs
@@ -80,10 +72,3 @@ extras = docs
 commands =
     pip freeze
     sphinx-build -W -b linkcheck . _build/html
-
-[testenv:codestyle]
-skip_install = true
-changedir = .
-description = check code style, e.g. with flake8
-deps = flake8
-commands = flake8 petrofit --count --max-line-length=100