diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
new file mode 100644
index 0000000..a6f52be
--- /dev/null
+++ b/.github/workflows/CI.yaml
@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  # GitHub has started calling new repo's first branch "main" https://github.com/github/renaming
+  # The cookiecutter uses the "--initial-branch" flag when it runs git-init
+  push:
+    branches:
+      - "ga"
+  pull_request:
+    branches:
+      - "master"
+  schedule:
+    # Weekly tests run on main by default:
+    #   Scheduled workflows run on the latest commit on the default or base branch.
+    #   (from https://help.github.com/en/actions/reference/events-that-trigger-workflows#scheduled-events-schedule)
+    - cron: "0 0 * * 0"
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }}, Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: [3.9, "3.10", 3.11]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Additional info about the build
+        shell: bash
+        run: |
+          uname -a
+          df -h
+          ulimit -a
+
+      - uses: mamba-org/setup-micromamba@v1
+        with:
+          environment-file: devtools/conda-envs/test_env.yaml
+          condarc: |
+            channels:
+              - conda-forge
+          create-args: >-
+            python=${{ matrix.python-version }}
+
+      - name: Install package
+        run: |
+          python -m pip install . --no-deps
+
+      - name: Run tests
+        shell: bash -l {0}
+        run: |
+          pytest -v -m "not slow" --cov=mosdef_cassandra --cov-report=xml --color=yes mosdef_cassandra/tests/
+
+      - name: Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-${{ matrix.os }}-py${{ matrix.python-version }}
\ No newline at end of file
diff --git a/.github/workflows/black.yml b/.github/workflows/black.yml
deleted file mode 100644
index 3272e6c..0000000
--- a/.github/workflows/black.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-# This is a basic workflow to help you get started with Actions
-
-name: Black formatting check
-
-# Controls when the action will run. Triggers the workflow on push or pull request
-# events but only for the master branch
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
-jobs:
-  # This workflow contains a single job called "black"
-  black:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-    - uses: actions/checkout@v2
-    # Run the black code formatter
-    - name: Black Code Formatter
-      uses: mflaxman/black-action@v1.0.2
-      with:
-        args: ". --check"
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
deleted file mode 100644
index d357088..0000000
--- a/azure-pipelines.yml
+++ /dev/null
@@ -1,162 +0,0 @@
-
-trigger:
-- master
-
-pr:
-  autoCancel: true
-  branches:
-    include:
-      - master
-
-schedules:
-- cron: "0 0 * * *"
-  displayName: Daily midnight build for master
-  branches:
-    include:
-      - master
-  always: true
-
-jobs:
-- job: BleedingMoSDeF
-  strategy:
-    matrix:
-      Python310Ubuntu:
-        imageName: 'ubuntu-22.04'
-        python.version: 3.10
-      Python311Ubuntu:
-        imageName: 'ubuntu-22.04'
-        python.version: 3.11
-      Python10macOS:
-        imageName: 'macOS-14'
-        python.version: 3.10
-      Python311macOS:
-        imageName: 'macOS-14'
-        python.version: 3.11
-
-  pool:
-    vmImage: $(imageName)
-
-  steps:
-    - bash: echo "##vso[task.prependpath]$CONDA/bin"
-      displayName: Add Conda to path
-
-    - bash : echo "##vso[task.prependpath]$(Build.SourcesDirectory)/Cassandra-1.3.1/bin"
-      displayName: Add Cassandra to path
-
-    - bash: |
-        conda config --set always_yes yes --set changeps1 no
-        conda config --add channels conda-forge
-        conda update -c defaults conda
-        conda update --all
-        conda create --yes -n bleeding-test-environment python=$(python.version) --file requirements-dev.txt
-      displayName: Create a new bleeding test environment
-
-    - bash: |
-        source activate bleeding-test-environment
-        wget https://github.com/MaginnGroup/Cassandra/archive/v1.3.1.tar.gz
-        tar -xzvf v1.3.1.tar.gz
-        cd Cassandra-1.3.1/Src
-        make -f Makefile.gfortran
-        mkdir ../bin
-        cp cassandra_gfortran.exe ../bin/.
-        cp ../Scripts/Frag_Library_Setup/library_setup.py ../bin/.
-        cd ../../
-      displayName: Build Cassandra
-
-    - bash: |
-        echo Working directory:
-        pwd
-        echo ls:
-        ls
-        echo PATH:
-        echo "$PATH"
-        echo CASSANDRA:
-        which cassandra_gfortran.exe
-        echo PYTHON2
-        which python2
-        echo LIBRARY_SETUP:
-        which library_setup.py
-      displayName: Check cassandra install
-
-    - bash: |
-        source activate bleeding-test-environment
-        git clone https://github.com/mosdef-hub/foyer.git
-        git clone https://github.com/mosdef-hub/mbuild.git
-        cd foyer
-        conda install --yes python=$(python.version) --file requirements-dev.txt
-        python -m pip install --user .
-        python -m pip uninstall mbuild -y
-        cd ..
-        cd mbuild
-        conda install --yes python=$(python.version) --file requirements-dev.txt
-        python -m pip install .
-        cd ..
-        python -m pip install .
-      displayName: clone,install foyer,mbuild; install mosdef_cassandra
-
-    - bash: |
-        source activate bleeding-test-environment
-        python -m pip install pytest-cov
-        python -m pip install pytest-azurepipelines
-        python -m pytest mosdef_cassandra/tests -v --cov=mosdef_cassandra --cov-report=html --pyargs
-      displayName: Run Tests
-
-    - bash: |
-        source activate bleeding-test-environment
-        coverage xml
-        bash <(curl -s https://codecov.io/bash) -t 022e3719-0209-42d8-ae36-488daf8e4e61
-      condition: and( eq( variables['Agent.OS'], 'Linux' ), eq( variables['python.version'], '3.7' ) )
-      displayName: Upload coverage
-
-- job: StandardMoSDeF
-  strategy:
-    matrix:
-      Python39Ubuntu:
-        imageName: 'ubuntu-20.04'
-        python.version: 3.9
-      Python38Ubuntu:
-        imageName: 'ubuntu-20.04'
-        python.version: 3.8
-      Python37macOS:
-        imageName: 'macOS-10.14'
-        python.version: 3.7
-      Python39macOS:
-        imageName: 'macOS-latest'
-        python.version: 3.9
-
-  pool:
-    vmImage: $(imageName)
-
-  steps:
-    - bash: echo "##vso[task.prependpath]$CONDA/bin"
-      displayName: Add Conda to path
-
-    # On Hosted macOS, the agent user doesn't have ownership of Miniconda's installation directory/
-    # We need to take ownership if we want to update conda or install packages globally
-    - bash: sudo chown -R $USER $CONDA
-      displayName: Take ownership of conda installation
-      condition: eq( variables['Agent.OS'], 'Darwin' )
-
-    - bash: |
-        conda config --set always_yes yes --set changeps1 no
-        conda config --add channels conda-forge
-        conda update -c defaults conda
-        conda update --all
-        conda create --yes -n test-environment python=$(python.version) --file requirements-test.txt
-      displayName: Create a new test environment
-
-    - bash: |
-        source activate test-environment
-        echo "PYTHON VERSION:"
-        python --version
-        echo "CASSANDRA EXEC:"
-        which cassandra.exe
-        python -m pip install --user .
-      displayName: clone,install foyer,mbuild; install mosdef_cassandra
-
-    - bash: |
-        source activate test-environment
-        python -m pip install --user pytest-azurepipelines
-        python -m pytest mosdef_cassandra/tests -v
-      displayName: Run Tests
-
diff --git a/devtools/conda-envs/dev_env.yaml b/devtools/conda-envs/dev_env.yaml
new file mode 100644
index 0000000..474dfbd
--- /dev/null
+++ b/devtools/conda-envs/dev_env.yaml
@@ -0,0 +1,24 @@
+name: dev_env
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+    # Base depends
+  - python
+  - networkx
+  - pytest
+  - pytest-cov
+  - pandas
+  - unyt
+  - foyer
+  - mbuild
+  - gmso >= 0.11.1
+  - pycifrw
+  - garnett
+  - constrainmol
+  - parmed
+  - cassandra
+  - openbabel
+  - black
+  - sphinx
+  - shinx_rtd_theme
\ No newline at end of file
diff --git a/devtools/conda-envs/test_env.yaml b/devtools/conda-envs/test_env.yaml
new file mode 100644
index 0000000..7747cb9
--- /dev/null
+++ b/devtools/conda-envs/test_env.yaml
@@ -0,0 +1,20 @@
+name: test
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+    # Base depends
+  - python
+  - networkx
+  - pytest
+  - pytest-cov
+  - pandas
+  - unyt
+  - foyer
+  - mbuild
+  - gmso >= 0.11.1
+  - pycifrw
+  - garnett
+  - constrainmol
+  - parmed
+  - cassandra
\ No newline at end of file