diff --git a/.travis.yml b/.travis.yml
index fc7a5de1..e515de77 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,6 +30,7 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then wget "https://github.com/Kozea/Ahem/blob/master/Ahem.ttf?raw=true" -O /Library/Fonts/Ahem.ttf; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew tap caskroom/fonts; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew pin numpy postgis; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew upgrade python; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew cask install font-dejavu-sans; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install cairo pango gdk-pixbuf libffi; fi