diff --git a/.ci/travis-install.sh b/.ci/travis-install.sh
index 9121515..191b775 100755
--- a/.ci/travis-install.sh
+++ b/.ci/travis-install.sh
@@ -3,9 +3,8 @@
 set -e -x
 
 if [ "${TRAVIS_OS_NAME}" == "osx" ]; then
-    git clone --depth 1 https://github.com/yyuu/pyenv.git ~/.pyenv
-    PYENV_ROOT="$HOME/.pyenv"
-    PATH="$PYENV_ROOT/bin:$PATH"
+    brew update >/dev/null
+    brew upgrade pyenv
     eval "$(pyenv init -)"
 
     if ! (pyenv versions | grep "${PYTHON_VERSION}$"); then
@@ -14,14 +13,11 @@ if [ "${TRAVIS_OS_NAME}" == "osx" ]; then
     pyenv global ${PYTHON_VERSION}
     pyenv rehash
 
-    brew update
-
     brew install gnu-sed --with-default-names
     brew outdated libtool || brew upgrade libtool
     brew outdated autoconf || brew upgrade autoconf --with-default-names
     brew outdated automake || brew upgrade automake --with-default-names
 fi
 
-pip install --upgrade pip wheel
-pip install --upgrade setuptools
+pip install --upgrade setuptools pip wheel
 pip install -r .ci/requirements.txt
diff --git a/.travis.yml b/.travis.yml
index b7ba7e7..a5acfa8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,14 +32,14 @@ matrix:
           osx_image: xcode7.3
           # Travis macOS env does not support Python yet,
           # so we have to set things up manually in install.sh.
-          env: BUILD=tests,wheels PYTHON_VERSION=3.5.4 PIP_USER=1
+          env: BUILD=tests,wheels PYTHON_VERSION=3.5.5
           branches: {only: [releases]}
 
         - os: osx
           osx_image: xcode7.3
           # Travis macOS env does not support Python yet,
           # so we have to set things up manually in install.sh.
-          env: BUILD=tests,wheels PYTHON_VERSION=3.6.3 PIP_USER=1
+          env: BUILD=tests,wheels PYTHON_VERSION=3.6.5
           branches: {only: [releases]}
 
         - os: linux