diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c7112642..e801a1ba 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-14, macos-15, macos-15-intel, macos-26, macos-26-intel, ubuntu-24.04, ubuntu-26.04-arm ]
+        os: [ macos-15, macos-15-intel, macos-26, macos-26-intel, ubuntu-24.04, ubuntu-26.04-arm ]
         compiler: [ gcc ]
         version: [ 12, 13, 14, 15, 16 ]
         extra_flags: [ -g ]
@@ -146,7 +146,7 @@ jobs:
       CFLAGS: ${{ matrix.extra_flags }}
       CONFIGURE_ARGS: --disable-mpi-compat --enable-rpath ${{ inputs.configure_args }}
       CURL_OPTIONS: --retry 10 --retry-all-errors --fail -L
-      BREW_WARNING_FILTER: 's/^[[:punct:]]*warning[[:punct:]]*(You are using macOS)/warn: \1/i'
+      BREW_WARNING_FILTER: 's/^[[:punct:]]+warning[[:punct:]]+/warning: /i'
       GASNET_BACKTRACE: 1
       GASNET_SPAWN_VERBOSE: 1
       GASNET_SPAWNFN: L
@@ -193,7 +193,8 @@ jobs:
           chmod +x install-homebrew.sh
           env CI=1 ./install-homebrew.sh
           HOMEBREW_PREFIX="/home/linuxbrew/.linuxbrew"
-          retry ${HOMEBREW_PREFIX}/bin/brew install -v gcc@${COMPILER_VERSION} binutils
+          retry ${HOMEBREW_PREFIX}/bin/brew install -v gcc@${COMPILER_VERSION} binutils \
+              2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0
           ls -al ${HOMEBREW_PREFIX}/bin
           echo "PATH=${HOMEBREW_PREFIX}/bin:${PATH}" >> "$GITHUB_ENV"
           : Homebrew GCC@15 needs binutils 2.44+
@@ -214,7 +215,8 @@ jobs:
       if: ${{ contains(matrix.os, 'macos') }}
       run: |
         # silence Homebrew tap trust warnings:
-        (set +e ; brew untap -f aws/tap hashicorp/tap 2>&1 | perl -pe 's/^::*//;s/^##*//' ; brew trust azure/bicep ; echo )
+        (set +e ; brew untap -f aws/tap hashicorp/tap ; brew trust azure/bicep ) \
+            2>&1 | perl -pe "$BREW_WARNING_FILTER"
         # set some Homebrew knobs to accelerate installation
         # but only when we are not simulating the user environment brew-via-install workflow
         if [[ -z "${{ matrix.brew_via_install }}" ]] ; then
@@ -227,7 +229,8 @@ jobs:
     - name: Install macOS Dependencies
       if: contains(matrix.os, 'macos')
       run: |
-        retry brew update
+        retry brew update \
+            2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0
         if [[ "${{ matrix.compiler }}@${{ matrix.version }}" == gcc@12 ]] ; then
           retry brew install gcc@12 \
               2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0