diff --git a/travis/macos-install.sh b/travis/macos-install.sh
index 7d71a92..e67d879 100755
--- a/travis/macos-install.sh
+++ b/travis/macos-install.sh
@@ -5,7 +5,7 @@ set -ex
 export HOMEBREW_NO_INSTALL_CLEANUP=1
 
 # Python 3.7.4 with 10.12 bottle
-brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/e9004bd764c9436750a50e0b428548f68fe6a38a/Formula/python.rb
+brew upgrade https://raw.githubusercontent.com/Homebrew/homebrew-core/e9004bd764c9436750a50e0b428548f68fe6a38a/Formula/python.rb
 
 which python3
 python3 --version