Try with explicit link.

--HG--
branch : develop

.travis.yml

@@ -20,11 +20,6 @@ jobs:
     - DEPLOY=true
     - LEGACY=false
     osx_image: xcode11
-    addons:
-        homebrew:
-          packages: 
-          - qt5
-        update: true
   - os: osx
     compiler: clang
     env: 
@@ -66,10 +61,10 @@ before_install:
     sudo dpkg -i ccache_3.3.4-1_amd64.deb;
   else
     brew update > /dev/null;
-    if [[ "$LEGACY" = false ]]; then
-      brew install qt5;
-    else
     unset SSL_CERT_FILE;
+    if [[ "$LEGACY" = false ]]; then
+      brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/master/Formula/qt.rb;
+    else
       brew install https://gist.githubusercontent.com/dismine/c3ac01de38e12edcf22d9e05791adf82/raw/20544ac8e68ef3523f92e15f432bbaf9a6aa2c22/qt5.rb;
     fi
     chmod -R 755 /usr/local/opt/qt5/*