diff --git a/.github/workflows/gha.yml b/.github/workflows/gha.yml
index a8706b1f7..59dc5b541 100644
--- a/.github/workflows/gha.yml
+++ b/.github/workflows/gha.yml
@@ -18,6 +18,9 @@ jobs:
         pattern: [0, 1, 2, 3]
     steps:
     - uses: actions/checkout@v1
+    - name: install gtest
+      run: |
+        brew install --force gtest
     - name: build and test
       env:
         CC: clang
@@ -48,22 +51,8 @@ jobs:
           export CHAR_SIGN="unsigned"
         fi
 
-        # install gtest
-        wget https://github.com/google/googletest/archive/release-1.7.0.zip -O googletest-release-1.7.0.zip
-        unzip -q googletest-release-1.7.0.zip
-        cd googletest-release-1.7.0
-        $CXX -m${ARCH} src/gtest-all.cc -I. -Iinclude -c
-        $CXX -m${ARCH} src/gtest_main.cc -I. -Iinclude -c
-        ar -rv libgtest.a gtest-all.o
-        ar -rv libgtest_main.a gtest_main.o
-        mkdir -p ${BASE}/usr/include
-        cp -r include/gtest ${BASE}/usr/include
-        mkdir -p ${BASE}/usr/lib
-        mv *.a ${BASE}/usr/lib
-        cd ..
-
         # build and test
-        CMAKE_CXX_COMPILER="${CXX}" CMAKE_C_COMPILER="${CC}" GTEST_ROOT="${BASE}/usr" CFLAGS="-Werror -g -fsanitize=undefined  -fno-sanitize-recover=all" CXXFLAGS="-Werror -g -ggdb3 -fsanitize=undefined  -fno-sanitize-recover=all" ${ACTION}
+        CMAKE_CXX_COMPILER="${CXX}" CMAKE_C_COMPILER="${CC}" CFLAGS="-Werror -g -fsanitize=undefined  -fno-sanitize-recover=all" CXXFLAGS="-Werror -g -ggdb3 -fsanitize=undefined  -fno-sanitize-recover=all" ${ACTION}
 
   linux:
     runs-on: ubuntu-latest