diff --git a/.github/workflows/ci_tests_dev.yaml b/.github/workflows/ci_tests_dev.yaml
new file mode 100644
index 00000000000..16ef1d6eb59
--- /dev/null
+++ b/.github/workflows/ci_tests_dev.yaml
@@ -0,0 +1,79 @@
+# This workflow installs PyGMT dependencies, builds documentation and runs tests on GMT master
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+
+name: GMT Master Tests
+
+on:
+  # push:
+  #   branches: [ master ]
+  pull_request:
+    types: [review_requested, ready_for_review]
+  # Schedule daily tests
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  test_gmt_master:
+    name: ${{ matrix.os }} - Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.8]
+        os: [ubuntu-20.04, macOS-10.15]
+    env:
+      # LD_LIBRARY_PATH: ${{ github.workspace }}/gmt/lib:$LD_LIBRARY_PATH
+      GMT_INSTALL_DIR: ${{ github.workspace }}/gmt-install-dir
+      GMT_LIBRARY_PATH: ${{ github.workspace }}/gmt-install-dir/lib
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    steps:
+      # Checkout current git repository
+      - name: Checkout
+        uses: actions/checkout@v2.3.1
+        with:
+          # fecth all history so that versioneer works
+          fetch-depth: 0
+
+      # Setup Miniconda
+      - name: Setup Miniconda
+        uses: goanpeca/setup-miniconda@v1.6.0
+        with:
+          python-version: ${{ matrix.python-version }}
+          channels: conda-forge
+
+      # Install build dependencies from conda-forge
+      - name: Install build dependencies
+        run: conda install cmake libblas libcblas liblapack fftw gdal ghostscript libnetcdf hdf5 zlib curl pcre ipython pytest pytest-cov pytest-mpl
+
+      # Install GMT master branch
+      - name: Install GMT from master
+        run: curl https://raw.githubusercontent.com/GenericMappingTools/gmt/master/ci/build-gmt-master.sh | bash
+
+      # Download cached remote files (artifacts) from Github
+      - name: Download remote data from Github
+        uses: dawidd6/action-download-artifact@v2.6.3
+        with:
+          workflow: cache_data.yaml
+          name: gmt-cache
+          path: .gmt
+
+      # Move downloaded files to ~/.gmt directory and list them
+      - name: Move and list downloaded remote files
+        shell: bash -l {0}
+        run: |
+          mkdir -p ~/.gmt
+          mv .gmt/* ~/.gmt
+          ls -lh ~/.gmt
+
+      # Install the package that we want to test
+      - name: Install the package
+        run: |
+          python setup.py sdist --formats=zip
+          pip install dist/*
+
+      # Run the tests
+      - name: Test with pytest
+        run: make test PYTEST_EXTRA="-r P"
diff --git a/MAINTENANCE.md b/MAINTENANCE.md
index 37b90a511ce..9b560e68013 100644
--- a/MAINTENANCE.md
+++ b/MAINTENANCE.md
@@ -42,16 +42,33 @@ The main advantages of this are:
 
 We use Github Actions and TravisCI continuous integration (CI) services to
 build and test the project on Linux, macOS and Windows.
-The configuration file for these services are in
-`.github/workflows/ci_tests.yaml` and `.travis.yml`.
 They rely on the `requirements.txt` file to install required dependencies using
 conda and the `Makefile` to run the tests and checks.
-There is also a `.github/workflows/cache_data.yaml` file which caches some GMT
-remote data files needed for the Github Actions CI on a regular basis.
+
+### Github Actions
+
+There are 3 configuration files located in `.github/workflows`:
+
+1. `ci_tests.yaml` (Style Checks, Tests on Linux/macOS/Windows)
+
+This is ran on every commit on the *master* and Pull Request branches.
+It is also scheduled to run daily on the *master* branch.
+
+2. `ci_tests_dev.yaml` (GMT Master Tests on Linux/macOS).
+
+This is only triggered when a review is requested or re-requested on a PR.
+It is also scheduled to run daily on the *master* branch.
+
+3. `cache_data.yaml` (Caches GMT remote data files needed for Github Actions CI)
+
+This is scheduled to run every Sunday at 12 noon.
 If new remote files are needed urgently, maintainers can manually uncomment
 the 'pull_request:' line in that `cache_data.yaml` file to refresh the cache.
 
-Travis also handles all of our deployments automatically:
+### Travis CI
+
+The configuration file is at `.travis.yml`.
+Travis runs tests (Linux only) and handles all of our deployments automatically:
 
 * Updating the development documentation by pushing the built HTML pages from the
   *master* branch onto the `dev` folder of the *gh-pages* branch.
diff --git a/README.rst b/README.rst
index 7d399e37489..8b56cfe997e 100644
--- a/README.rst
+++ b/README.rst
@@ -13,8 +13,11 @@ PyGMT
     :alt: Travis CI build status
     :target: https://travis-ci.org/GenericMappingTools/pygmt
 .. image:: https://github.com/GenericMappingTools/pygmt/workflows/Tests/badge.svg
-    :alt: GitHub Actions build status
-    :target: https://github.com/GenericMappingTools/pygmt/actions
+    :alt: GitHub Actions Tests status
+    :target: https://github.com/GenericMappingTools/pygmt/actions?query=workflow%3ATests
+.. image:: https://github.com/GenericMappingTools/pygmt/workflows/GMT%20Master%20Tests/badge.svg
+    :alt: GitHub Actions GMT Master Tests status
+    :target: https://github.com/GenericMappingTools/pygmt/actions?query=workflow%3A"GMT+Master+Tests"
 .. image:: https://img.shields.io/codecov/c/github/GenericMappingTools/pygmt/master.svg?style=flat-square
     :alt: Test coverage status
     :target: https://codecov.io/gh/GenericMappingTools/pygmt