diff --git a/scripts/ci/before_install.sh b/scripts/ci/before_install.sh
index 66469fd2d..d02a5074f 100644
--- a/scripts/ci/before_install.sh
+++ b/scripts/ci/before_install.sh
@@ -4,6 +4,8 @@ set -x
 set -e
 
 if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+    brew update
+    brew upgrade pyenv
     # NOTE: used to install and run our style checking tools
     osx_python_ver=3.6.2
     eval "$(pyenv init -)"