diff --git a/.travis.yml b/.travis.yml
index 20283d195c29..393dd7826d79 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -103,6 +103,7 @@ before_install: |
     export PATH=/usr/lib/ccache:$PATH
   else
     ci/silence brew update
+    brew uninstall numpy gdal postgis
     brew upgrade python
     brew install ffmpeg imagemagick mplayer ccache
     hash -r