diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 8c9a038..753d304 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -3,9 +3,9 @@ name: macOS
 on:
   push:
     branches:
-      - dev
       - brew
-  
+  pull_request:
+    branches: [ "master" ]  
   workflow_dispatch:
 
 jobs:
diff --git a/install-forefire-osx.sh b/install-forefire-osx.sh
index 651dbc5..06db6dd 100644
--- a/install-forefire-osx.sh
+++ b/install-forefire-osx.sh
@@ -12,9 +12,9 @@ if ! xcode-select -p > /dev/null 2>&1; then
 fi
 
 # Install dependencies via Homebrew.
-brew install cmake
-brew install netcdf
-brew install netcdf-cxx
+brew reinstall cmake
+brew reinstall netcdf
+brew reinstall netcdf-cxx
 
 # Set NETCDF_HOME to the prefix for the NetCDF C library.
 export NETCDF_HOME=$(brew --prefix netcdf)