diff --git a/.github/workflows/release-tests.yml b/.github/workflows/release-tests.yml
index 7f8d50c684..11a6e2b384 100644
--- a/.github/workflows/release-tests.yml
+++ b/.github/workflows/release-tests.yml
@@ -20,7 +20,11 @@ jobs:
         with:
           # virtualenv 15.1.0 cannot be installed on Python 3.10+
           python-version: 3.9
+        env:
+          PIP_TRUSTED_HOST: "pypi.python.org pypi.org files.pythonhosted.org"
       - name: Create Python virtual environment with virtualenv==15.1.0
+        env:
+          PIP_TRUSTED_HOST: "pypi.python.org pypi.org files.pythonhosted.org"
         run: |
           python -m pip install virtualenv==15.1.0
           python -m virtualenv venv2