diff --git a/.github/workflows/python-module.yml b/.github/workflows/python-module.yml
index 3c7bbce..7d43dc9 100644
--- a/.github/workflows/python-module.yml
+++ b/.github/workflows/python-module.yml
@@ -57,11 +57,16 @@ jobs:
 
   build_mac:
     runs-on: macOS-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [3.6, 3.7]
     steps:
     - uses: actions/checkout@v1
-    - uses: actions/setup-python@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
       with:
-        python-version: '3.x' # Version range or exact version of a Python version to use, using semvers version range syntax.
+        python-version: ${{ matrix.python-version }}
         architecture: 'x64' # (x64 or x86)
     - name: Install Rust and lz4
       run: |
@@ -92,11 +97,16 @@ jobs:
 
   build_win:
     runs-on: windows-2019
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [3.6, 3.7]
     steps:
     - uses: actions/checkout@v1
-    - uses: actions/setup-python@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
       with:
-        python-version: '3.x' # Version range or exact version of a Python version to use, using semvers version range syntax.
+        python-version: ${{ matrix.python-version }}
         architecture: 'x64' # (x64 or x86)
     - name: Install lz4
       shell: bash