diff --git a/tests/travis_install.sh b/tests/travis_install.sh
index d37350e625281e087fce8aaa9654ad98d2a53b73..ed83d78348c43850b22012191017cdddd7ac2ab5 100644
--- a/tests/travis_install.sh
+++ b/tests/travis_install.sh
@@ -44,6 +44,7 @@ fi
 
 # for all
 pip3 install -U pip wheel setuptools
+pip3 install -U cppimport pybind11
 pip3 install tox
 pip3 install codecov
 pip3 install sphinx