diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index c9ccfbfc3..212924cc7 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -35,8 +35,8 @@ jobs:
       - name: Install (macOS)
         if: runner.os == 'macOS'
         run: |
-          brew tap ProfFan/my
-          brew install cmake ninja ProfFan/my/boost@1.59
+          brew install cmake ninja
+          brew install https://github.com/Homebrew/homebrew-core/raw/0687baaf14e7b16c383d101fcc3b954cfb05ffe8/Formula/boost.rb
           if [ "${{ matrix.compiler }}" = "gcc" ]; then
             brew install gcc@${{ matrix.version }}
             echo "::set-env name=CC::gcc-${{ matrix.version }}"
diff --git a/.github/workflows/build-python.yml b/.github/workflows/build-python.yml
index f75701215..f6930a8c4 100644
--- a/.github/workflows/build-python.yml
+++ b/.github/workflows/build-python.yml
@@ -87,8 +87,8 @@ jobs:
       - name: Install (macOS)
         if: runner.os == 'macOS'
         run: |
-          brew tap ProfFan/my
-          brew install cmake ninja ProfFan/my/boost@1.59
+          brew install cmake ninja
+          brew install https://github.com/Homebrew/homebrew-core/raw/0687baaf14e7b16c383d101fcc3b954cfb05ffe8/Formula/boost.rb
           if [ "${{ matrix.compiler }}" = "gcc" ]; then
             brew install gcc@${{ matrix.version }}
             echo "::set-env name=CC::gcc-${{ matrix.version }}"