-source "/tmp/v/jenkins/bin/activate"
-pip install --quiet --upgrade pip
-pip install --quiet --upgrade tox beautifulsoup4 requests
+. "/tmp/v/jenkins/bin/activate"
+# Remove pip cache to avoid cache entry deserialization failures
+rm -rf ~/.cache/pip/
+pip install --quiet --upgrade pip setuptools
+pip install --quiet --upgrade tox
+pip install --quiet --upgrade beautifulsoup4
+pip install --quiet --upgrade requests