install/upgrade pyenv in os x builders
diff --git a/.travis/install.sh b/.travis/install.sh
index 8e791b3..929cf48 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -5,6 +5,8 @@
 
 if [[ "$(uname -s)" == 'Darwin' ]]; then
     brew update || brew update
+    brew install pyenv
+    brew outdated pyenv || brew upgrade pyenv
 
     if [[ "${OPENSSL}" != "0.9.8" ]]; then
         brew outdated openssl || brew upgrade openssl
@@ -24,22 +26,18 @@
             python get-pip.py --user
             ;;
         py33)
-            brew outdated pyenv || brew upgrade pyenv
             pyenv install 3.3.6
             pyenv global 3.3.6
             ;;
         py34)
-            brew outdated pyenv || brew upgrade pyenv
             pyenv install 3.4.2
             pyenv global 3.4.2
             ;;
         pypy)
-            brew outdated pyenv || brew upgrade pyenv
             pyenv install pypy-2.6.1
             pyenv global pypy-2.6.1
             ;;
         pypy3)
-            brew outdated pyenv || brew upgrade pyenv
             pyenv install pypy3-2.4.0
             pyenv global pypy3-2.4.0
             ;;