diff --git a/.github/workflows/pythonbuild.yml b/.github/workflows/pythonbuild.yml
index 21b3b1e..5da2108 100644
--- a/.github/workflows/pythonbuild.yml
+++ b/.github/workflows/pythonbuild.yml
@@ -77,7 +77,6 @@ jobs:
         os: [ubuntu-18.04, windows-latest, macos-latest]
     env:
       CIBW_SKIP: cp27-* pp27-*
-      MACOSX_DEPLOYMENT_TARGET: "10.9"
 
     steps:
     - uses: actions/checkout@v1
@@ -91,7 +90,7 @@ jobs:
 
     - name: Install cibuildwheel
       run: |
-        python -m pip install cibuildwheel==1.3.0
+        python -m pip install git+https://github.com/joerick/cibuildwheel.git@python3.9
 
     - name: Build wheel
       run: |