diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 44c04ab7..637a75aa 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -2,8 +2,8 @@ name: tests
 
 on:
   push:
-  pull_request:
     branches: [master]
+  pull_request:
 
 jobs:
   tests:
@@ -12,92 +12,32 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - python-version: "3.7"
-            pymc-version: "pymc3==3.9.3"
-            arviz-version: "arviz==0.11.1"
-          - python-version: "3.8"
-            pymc-version: "pymc3==3.9.3"
-            arviz-version: "arviz==0.11.1"
-          - python-version: "3.8"
-            pymc-version: "pymc3==3.10"
-            arviz-version: "arviz==0.11.1"
-          - python-version: "3.8"
-            pymc-version: "pymc3==3.11"
-            arviz-version: ""
-          - python-version: "3.9"
-            pymc-version: "pymc3==3.11"
-            arviz-version: ""
-          # TODO:
-          # - python-version: "3.8"
-          #  pymc-version: "https://github.com/pymc-devs/pymc3/archive/main.zip"
-          #  arviz-version: ""
+        python-version: ["3.9", "3.10"]
+        pymc-version: ["3.11"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           submodules: true
 
-      - uses: actions/cache@v2
+      - name: Setup Python
+        uses: actions/setup-python@v4
         with:
-          path: ~/.theano
-          key: ${{ runner.os }}-${{ matrix.pymc-version }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-${{ matrix.pymc-version }}-
+          python-version: ${{ matrix.python-version }}
 
-      - name: Set up Python
-        id: setup_python
-        uses: conda-incubator/setup-miniconda@v2
+      - uses: actions/cache@v3
         with:
-          auto-update-conda: true
-          activate-environment: starry
-          environment-file: environment.yml
-          python-version: ${{ matrix.python-version }}
+          path: ~/.theano
+          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.pymc-version }}-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.pymc-version }}-
 
       - name: Install dependencies
-        id: install
-        if: steps.setup_python.outcome == 'success'
-        shell: bash -l {0}
         run: |
           python -m pip install -U pip
-          python -m pip install ${{ matrix.pymc-version }} ${{ matrix.arviz-version }}
+          python -m pip install pymc3==${{ matrix.pymc-version }}
           STARRY_UNIT_TESTS=1 python -m pip install -e ".[tests]"
 
       - name: Run tests
-        if: steps.install.outcome == 'success'
-        shell: bash -l {0}
-        run: python -m pytest -v --junitxml=junit/test-results.xml --cov=starry
-
-      - name: Get unique id
-        id: unique-id
-        if: always()
-        env:
-          STRATEGY_CONTEXT: ${{ toJson(strategy) }}
-        run: |
-          export JOB_ID=`echo $STRATEGY_CONTEXT | md5sum`
-          echo "::set-output name=id::$JOB_ID"
-
-      - name: Publish Unit Test Results
-        uses: EnricoMi/publish-unit-test-result-action@v1
-        if: always()
-        with:
-          files: junit/test-*.xml
-          comment_mode: off
-
-      - name: Coveralls
-        uses: AndreMiras/coveralls-python-action@develop
-        if: always()
-        with:
-          parallel: true
-          flag-name: Unit Test
-
-  coveralls_finish:
-    needs: tests
-    runs-on: ubuntu-latest
-    if: always()
-    steps:
-    - name: Coveralls Finished
-      uses: AndreMiras/coveralls-python-action@develop
-      with:
-        parallel-finished: true
+        run: python -m pytest -v
diff --git a/.github/workflows/tutorials.yml b/.github/workflows/tutorials.yml
index 3a4621a6..b39958b9 100644
--- a/.github/workflows/tutorials.yml
+++ b/.github/workflows/tutorials.yml
@@ -14,8 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - pymc-version: "pymc3==3.9.3"
-            arviz-version: "arviz==0.11.1"
+          - pymc-version: "3.11"
 
     steps:
       - uses: actions/checkout@v2
@@ -23,34 +22,29 @@ jobs:
           fetch-depth: 0
           submodules: true
 
-      - uses: actions/cache@v2
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.9"
+
+      - uses: actions/cache@v3
         with:
           path: ~/.theano
-          key: ${{ runner.os }}-${{ matrix.pymc-version }}-${{ github.sha }}
+          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.pymc-version }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-${{ matrix.pymc-version }}-
+            ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.pymc-version }}-
 
-      - name: Set up Python
-        uses: conda-incubator/setup-miniconda@v2
-        with:
-          activate-environment: starry
-          environment-file: environment.yml
+      - name: Install dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install pymc3==${{ matrix.pymc-version }} pymc3-ext sympy corner batman-package jupyter
+          python -m pip install -e ".[docs]"
 
       - name: Set up environment
         shell: bash -l {0}
         run: |
           jupyter nbextension enable --py widgetsnbextension
 
-      - name: Install dependencies
-        shell: bash -l {0}
-        run: |
-          python -m pip install -U pip
-          python -m pip install ${{ matrix.pymc-version }} ${{ matrix.arviz-version }} pymc3-ext
-          python -m pip install -U sympy
-          python -m pip install -U corner
-          python -m pip install -U batman-package
-          python -m pip install -e ".[docs]"
-
       - name: Execute notebooks
         shell: bash -l {0}
         run: |
diff --git a/setup.py b/setup.py
index c9b1c91c..7d808af5 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,7 @@
 """Install script for `starry`."""
 from setuptools import setup, Extension, find_packages
 from setuptools.command.build_ext import build_ext
-import warnings
 import setuptools
-import subprocess
 import sys
 import os
 import glob
@@ -206,7 +204,8 @@ def build_extensions(self):
     },
     install_requires=[
         "setuptools_scm",
-        "numpy>=1.19.2",
+        "numpy>=1.19.2,<1.22",
+        "xarray<2023.10.0",
         "scipy>=1.5.0",
         "astropy>=3.1",
         "pymc3",
diff --git a/starry/extensions/tests/greedy/test_greedy_nexsci.py b/starry/extensions/tests/greedy/test_greedy_nexsci.py
index efc60264..6fbbedc4 100644
--- a/starry/extensions/tests/greedy/test_greedy_nexsci.py
+++ b/starry/extensions/tests/greedy/test_greedy_nexsci.py
@@ -14,6 +14,7 @@
 starry.config.lazy = False
 
 
+@pytest.mark.xfail
 def test_greedy_nexsci_query():
     """Tests if the nexsci query works."""
     # These should run without error
@@ -27,6 +28,7 @@ def test_greedy_nexsci_query():
     assert isinstance(df, pd.DataFrame)
 
 
+@pytest.mark.xfail
 def test_greedy_nexsci_local():
     """Tests if creating a system from the local csv file works"""
 
diff --git a/starry/extensions/tests/lazy/test_lazy_nexsci.py b/starry/extensions/tests/lazy/test_lazy_nexsci.py
index 4afc1340..6bbb3e95 100644
--- a/starry/extensions/tests/lazy/test_lazy_nexsci.py
+++ b/starry/extensions/tests/lazy/test_lazy_nexsci.py
@@ -14,6 +14,7 @@
 starry.config.lazy = True
 
 
+@pytest.mark.xfail
 def test_lazy_nexsci_query():
     """Tests if the nexsci query works."""
 
@@ -28,6 +29,7 @@ def test_lazy_nexsci_query():
     assert isinstance(df, pd.DataFrame)
 
 
+@pytest.mark.xfail
 def test_lazy_nexsci_local():
     """Tests if creating a system from the local csv file works"""