XERCESC-2201: travis-ci updates homebrew packages
diff --git a/.travis.yml b/.travis.yml
index 2c11800..6b166f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -35,6 +35,7 @@
     - libtool
     - cmake
     - ninja
+    update: true
 
 os:
   - linux