diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index ed38ce5..057a109 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -48,6 +48,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.7]
+        pymc3-version: [stable, dev]
 
     steps:
     - uses: actions/checkout@v2
@@ -60,6 +61,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        if [[ "${{ matrix.pymc3-version }}" != "stable" ]]; then pip install "pymc3 @ git+https://github.com/pymc-devs/pymc3.git@master"; fi
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Test with pytest
       run: |