diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 2a5392b2b68..8e3982647e5 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -16,6 +16,10 @@ Fixes #
 - [ ] Write detailed docstrings for all functions/methods.
 - [ ] If adding new functionality, add an example to docstrings or tutorials.
 
-**Notes**
+**Slash Commands**
 
-- You can write `/format` in the first line of a comment to lint the code automatically
+You can write slash commands (`/command`) in the first line of a comment to perform
+specific operations. Supported slash commands are:
+
+- `/format`: automatically format and lint the code
+- `/test-gmt-dev`: run full tests on the latest GMT development version
diff --git a/.github/workflows/ci_tests_dev.yaml b/.github/workflows/ci_tests_dev.yaml
index 92a407749e1..1bae79758ab 100644
--- a/.github/workflows/ci_tests_dev.yaml
+++ b/.github/workflows/ci_tests_dev.yaml
@@ -1,13 +1,15 @@
-# This workflow installs PyGMT dependencies, builds documentation and runs tests on GMT latest
+# This workflow installs PyGMT dependencies, builds documentation and runs tests on GMT dev version
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: GMT Latest Tests
+name: GMT Dev Tests
 
 on:
   # push:
   #   branches: [ master ]
   pull_request:
-    types: [review_requested, ready_for_review]
+    types: [ready_for_review]
+  repository_dispatch:
+    types: [test-gmt-dev-command]
   # Schedule daily tests
   schedule:
     - cron: '0 0 * * *'
@@ -36,10 +38,31 @@ jobs:
       # Checkout current git repository
       - name: Checkout
         uses: actions/checkout@v2.3.4
+        if: github.event_name != 'repository_dispatch'
         with:
           # fecth all history so that setuptools-scm works
           fetch-depth: 0
 
+      # Generate token from GenericMappingTools bot
+      - name: Generate token from GenericMappingTools bot
+        uses: tibdex/github-app-token@v1
+        if: github.event_name == 'repository_dispatch'
+        id: generate-token
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+
+      # Checkout the pull request branch
+      - name: Checkout
+        uses: actions/checkout@v2
+        if: github.event_name == 'repository_dispatch'
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.client_payload.pull_request.head.ref }}
+          # fecth all history so that setuptools-scm works
+          fetch-depth: 0
+
       # Setup Miniconda
       - name: Setup Miniconda
         uses: conda-incubator/setup-miniconda@v2.0.0
@@ -106,3 +129,12 @@ jobs:
         with:
           name: artifact-GMT-${{ matrix.gmt_git_ref }}-${{ runner.os }}
           path: tmp-test-dir-with-unique-name
+
+      - name: Add reaction
+        uses: peter-evans/create-or-update-comment@v1
+        if: github.event_name == 'repository_dispatch'
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
+          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
+          reaction-type: hooray
diff --git a/.github/workflows/slash-command-dispatch.yml b/.github/workflows/slash-command-dispatch.yml
index 84ad9d400d2..918597888e1 100644
--- a/.github/workflows/slash-command-dispatch.yml
+++ b/.github/workflows/slash-command-dispatch.yml
@@ -21,5 +21,6 @@ jobs:
           token: ${{ steps.generate-token.outputs.token }}
           commands: |
             format
+            test-gmt-dev
           issue-type: pull-request
           permission: none
diff --git a/MAINTENANCE.md b/MAINTENANCE.md
index af80e4bc82c..07c8f04b853 100644
--- a/MAINTENANCE.md
+++ b/MAINTENANCE.md
@@ -60,10 +60,10 @@ On the *master* branch, the workflow also handles the documentation deployment:
   *master* branch onto the `dev` folder of the *gh-pages* branch.
 * Updated the `latest` documentation link to the new release.
 
-2. `ci_tests_dev.yaml` (GMT Latest Tests on Linux/macOS/Windows).
+2. `ci_tests_dev.yaml` (GMT Dev Tests on Linux/macOS/Windows).
 
-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.
+This is triggered when a PR is marked as "ready for review", or using the slash
+command `/test-gmt-dev`. 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)
 
diff --git a/README.rst b/README.rst
index 592c93facc6..c0a54d5153b 100644
--- a/README.rst
+++ b/README.rst
@@ -13,8 +13,8 @@ PyGMT
 .. image:: https://github.com/GenericMappingTools/pygmt/workflows/Tests/badge.svg
     :alt: GitHub Actions Tests status
     :target: https://github.com/GenericMappingTools/pygmt/actions?query=workflow%3ATests
-.. image:: https://github.com/GenericMappingTools/pygmt/workflows/GMT%20Latest%20Tests/badge.svg
-    :alt: GitHub Actions GMT Latest Tests status
+.. image:: https://github.com/GenericMappingTools/pygmt/workflows/GMT%20Dev%20Tests/badge.svg
+    :alt: GitHub Actions GMT Dev Tests status
     :target: https://github.com/GenericMappingTools/pygmt/actions?query=workflow%3A%22GMT+Latest+Tests%22
 .. image:: https://img.shields.io/codecov/c/github/GenericMappingTools/pygmt/master.svg?style=flat-square
     :alt: Test coverage status