diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 4665d34..62a61bf 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -55,6 +55,7 @@
     virtualenv $VENV_DIR
     source ${VENV_DIR}/bin/activate
     python -m pip install salt${PIP_SALT_VERSION}
+    python -m pip install 'msgpack<1' 'setuptools<45' jsonschema
     if [[ -f ${CURDIR}/test-requirements.txt ]]; then
        python -m pip install -r ${CURDIR}/test-requirements.txt
     fi