diff --git a/.ci/install.sh b/.ci/install.sh
index 8a3b8fee4..36bce295c 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -30,6 +30,7 @@ pip install -U pytest-cov
 pip install pyroma
 pip install test-image-results
 pip install numpy
+if [ "$TRAVIS_PYTHON_VERSION" == "3.9-dev" ]; then pip install setuptools==47.3.1 ; fi
 if [[ $TRAVIS_PYTHON_VERSION == 3.* ]]; then
   # arm64, ppc64le, s390x CPUs:
   # "ERROR: Could not find a version that satisfies the requirement pyqt5"