diff --git a/.github/workflows/package-macos.yml b/.github/workflows/package-macos.yml
index 30830039c..812b7105f 100644
--- a/.github/workflows/package-macos.yml
+++ b/.github/workflows/package-macos.yml
@@ -49,6 +49,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools wheel
         pip install -r requirements-build.txt
+        pip install PyInstaller==3.5
         pip install -r requirements-macos.txt
     - name: Run tests
       run: |