diff --git a/.travis/install.sh b/.travis/install.sh
index 92d639e2de1a0..24d32330cec0d 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -6,6 +6,7 @@ if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
     eval "${MATRIX_EVAL}"
     echo "python version: $PYTHON_VERSION"
     brew update > /dev/null
+    brew upgrade pyenv
     # use pyenv to build python
     eval "$(pyenv init -)"
     pyenv install $PYTHON_VERSION