diff --git a/.github/workflows/public-ci.yml b/.github/workflows/public-ci.yml
index 32f1546..1ee610f 100644
--- a/.github/workflows/public-ci.yml
+++ b/.github/workflows/public-ci.yml
@@ -16,7 +16,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install CI deps
         run: |
-          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade pip setuptools wheel pytest==6.0.0
           python -m pip install shapely -f ${{ secrets.CI_PIP_INDEX_URL }}/simple/shapely/index.html
       - name: Build wheel
         run: |