diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 9823252c58..cc63677a24 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -24,8 +24,6 @@ jobs:
           path: /home/runner/.cache/bazel
           key: bazel_benchmark
       - name: setup
-        env:
-          GOOGLETEST_VERSION: 1.13.0
         run: |
           sudo -E ./ci/setup_cmake.sh
           sudo -E ./ci/setup_ci_environment.sh
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ace58fe8dc..ff33aa46e3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-10
         CXX: /usr/bin/g++-10
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -77,7 +76,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-12
         CXX: /usr/bin/g++-12
-        GOOGLETEST_VERSION: 1.13.0
         PROTOBUF_VERSION: 21.12
       run: |
         sudo -E ./ci/setup_cmake.sh
@@ -110,7 +108,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-12
         CXX: /usr/bin/g++-12
-        GOOGLETEST_VERSION: 1.13.0
         PROTOBUF_VERSION: 21.12
       run: |
         sudo -E ./ci/setup_cmake.sh
@@ -143,7 +140,6 @@ jobs:
       env:
         CC: /usr/bin/clang-14
         CXX: /usr/bin/clang++-14
-        GOOGLETEST_VERSION: 1.13.0
         PROTOBUF_VERSION: 21.12
       run: |
         sudo -E ./ci/setup_cmake.sh
@@ -176,7 +172,6 @@ jobs:
       env:
         CC: /usr/bin/clang-14
         CXX: /usr/bin/clang++-14
-        GOOGLETEST_VERSION: 1.13.0
         PROTOBUF_VERSION: 21.12
       run: |
         sudo -E ./ci/setup_cmake.sh
@@ -223,7 +218,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-10
         CXX: /usr/bin/g++-10
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -242,8 +236,6 @@ jobs:
       with:
         submodules: 'recursive'
     - name: setup
-      env:
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -260,8 +252,6 @@ jobs:
       with:
         submodules: 'recursive'
     - name: setup
-      env:
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -287,6 +277,7 @@ jobs:
       env:
         CC: /usr/bin/gcc-4.8
         CXX: /usr/bin/g++-4.8
+        GOOGLETEST_VERSION: 1.10.0
       run: |
         sudo -E ./ci/setup_cmake.sh
     - name: run tests
@@ -314,6 +305,7 @@ jobs:
       env:
         CC: /usr/bin/gcc-4.8
         CXX: /usr/bin/g++-4.8
+        GOOGLETEST_VERSION: 1.10.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_grpc.sh -v 4.8
@@ -333,7 +325,6 @@ jobs:
     - name: setup
       env:
         CMAKE_VERSION: 3.20.6
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_ci_environment.sh
         sudo -E ./ci/setup_cmake.sh
@@ -355,7 +346,6 @@ jobs:
         CXX: /usr/bin/clang++
         CXXFLAGS: "-stdlib=libc++"
         CMAKE_VERSION: 3.20.6
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_ci_environment.sh
         sudo -E ./ci/setup_cmake.sh
@@ -380,8 +370,6 @@ jobs:
       with:
         submodules: 'recursive'
     - name: setup
-      env:
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -398,8 +386,6 @@ jobs:
       with:
         submodules: 'recursive'
     - name: setup
-      env:
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -416,8 +402,6 @@ jobs:
       with:
         submodules: 'recursive'
     - name: setup
-      env:
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -437,7 +421,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-10
         CXX: /usr/bin/g++-10
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
@@ -767,7 +750,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-10
         CXX: /usr/bin/g++-10
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index b751e6d407..8d0071ce11 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -22,7 +22,6 @@ jobs:
       env:
         CC: /usr/bin/gcc-10
         CXX: /usr/bin/g++-10
-        GOOGLETEST_VERSION: 1.13.0
       run: |
         sudo -E ./ci/setup_cmake.sh
         sudo -E ./ci/setup_ci_environment.sh
diff --git a/CMakeLists.txt b/CMakeLists.txt
index db42f74a33..d788a14c6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -512,7 +512,6 @@ list(APPEND CMAKE_PREFIX_PATH "${CMAKE_BINARY_DIR}")
 
 include(CTest)
 if(BUILD_TESTING)
-  set(CMAKE_CXX_STANDARD 20)
   add_definitions(-DENABLE_TEST)
   if(EXISTS ${CMAKE_BINARY_DIR}/lib/libgtest.a)
     # Prefer GTest from build tree. GTest is not always working with
diff --git a/ci/do_ci.sh b/ci/do_ci.sh
index 72804e0493..5b2b749a1b 100755
--- a/ci/do_ci.sh
+++ b/ci/do_ci.sh
@@ -79,6 +79,7 @@ if [[ "$1" == "cmake.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_PROMETHEUS=ON \
         -DWITH_ZIPKIN=ON \
         -DWITH_ELASTICSEARCH=ON \
@@ -93,6 +94,7 @@ elif [[ "$1" == "cmake.maintainer.sync.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_HTTP=ON \
         -DWITH_OTLP_HTTP_SSL_PREVIEW=ON \
         -DWITH_OTLP_HTTP_SSL_TLS_PREVIEW=ON \
@@ -115,6 +117,7 @@ elif [[ "$1" == "cmake.maintainer.async.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_HTTP=ON \
         -DWITH_OTLP_HTTP_SSL_PREVIEW=ON \
         -DWITH_OTLP_HTTP_SSL_TLS_PREVIEW=ON \
@@ -160,6 +163,7 @@ elif [[ "$1" == "cmake.with_async_export.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_PROMETHEUS=ON \
         -DWITH_ZIPKIN=ON \
         -DWITH_ELASTICSEARCH=ON \
@@ -175,6 +179,7 @@ elif [[ "$1" == "cmake.abseil.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_METRICS_EXEMPLAR_PREVIEW=ON \
         -DWITH_LOGS_PREVIEW=ON \
         -DCMAKE_CXX_FLAGS="-Werror $CXXFLAGS" \
@@ -188,6 +193,7 @@ elif [[ "$1" == "cmake.opentracing_shim.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug \
+        -DCMAKE_CXX_STANDARD=14 \
         -DCMAKE_CXX_FLAGS="-Werror -Wno-error=redundant-move $CXXFLAGS" \
         -DWITH_OPENTRACING=ON \
         "${SRC_DIR}"
@@ -198,9 +204,9 @@ elif [[ "$1" == "cmake.c++20.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=20 \
         -DCMAKE_CXX_FLAGS="-Werror $CXXFLAGS" \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
-        -DCMAKE_CXX_STANDARD=20 \
         "${SRC_DIR}"
   make -j $(nproc)
   make test
@@ -209,11 +215,11 @@ elif [[ "$1" == "cmake.c++20.stl.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=20 \
         -DWITH_METRICS_EXEMPLAR_PREVIEW=ON \
         -DWITH_LOGS_PREVIEW=ON \
         -DCMAKE_CXX_FLAGS="-Werror $CXXFLAGS" \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
-        -DCMAKE_CXX_STANDARD=20 \
         -DWITH_STL=ON \
         "${SRC_DIR}"
   make -j $(nproc)
@@ -225,8 +231,8 @@ elif [[ "$1" == "cmake.legacy.test" ]]; then
   export BUILD_ROOT="${BUILD_DIR}"
   ${SRC_DIR}/tools/build-benchmark.sh
   cmake -DCMAKE_BUILD_TYPE=Debug  \
-        -DCMAKE_CXX_FLAGS="-Werror $CXXFLAGS" \
         -DCMAKE_CXX_STANDARD=11 \
+        -DCMAKE_CXX_FLAGS="-Werror $CXXFLAGS" \
         "${SRC_DIR}"
   make -j $(nproc)
   make test
@@ -252,6 +258,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
         -DWITH_OTLP_GRPC_SSL_MTLS_PREVIEW=ON \
@@ -266,6 +273,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.shared_libs.with_static_grpc.test" ]]
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
         -DBUILD_SHARED_LIBS=ON \
@@ -280,6 +288,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.with_async_export.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
@@ -294,6 +303,7 @@ elif [[ "$1" == "cmake.do_not_install.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
@@ -420,6 +430,7 @@ elif [[ "$1" == "code.coverage" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *
   cmake -DCMAKE_BUILD_TYPE=Debug  \
+        -DCMAKE_CXX_STANDARD=14 \
         -DCMAKE_CXX_FLAGS="-Werror --coverage $CXXFLAGS" \
         "${SRC_DIR}"
   make
diff --git a/ci/setup_cmake.sh b/ci/setup_cmake.sh
index 02f6a20f7d..7c96d17c88 100755
--- a/ci/setup_cmake.sh
+++ b/ci/setup_cmake.sh
@@ -9,19 +9,22 @@ export DEBIAN_FRONTEND=noninteractive
 apt-get update
 
 if [ "x$CMAKE_VERSION" = "x" ]; then
+  # By default, CMake version set the following version.
   export CMAKE_VERSION=3.15.2
 fi
 
 # This variable not set on CI pipeline for only legacy environment(GCC 4.8).
 # With 1.13.0 version, C++14 must be set which does not supported by legacy environment anymore.
 # Also with this version, release version path needs to be adapted.
-if [ "x$GOOGLETEST_VERSION" = "x" ]; then
-  export GOOGLETEST_VERSION=1.10.0
-  GOOGLETEST_VERSION_PATH="release-${GOOGLETEST_VERSION}"
-  GOOGLETEST_FOLDER_PATH="googletest-release-${GOOGLETEST_VERSION}"
-else
+if [ -z "${GOOGLETEST_VERSION}" ]; then
+  # By default, GoogleTest version set the following version.
+  export GOOGLETEST_VERSION=1.13.0
   GOOGLETEST_VERSION_PATH="v${GOOGLETEST_VERSION}"
   GOOGLETEST_FOLDER_PATH="googletest-${GOOGLETEST_VERSION}"
+else
+  GOOGLETEST_VERSION_PATH="release-${GOOGLETEST_VERSION}"
+  GOOGLETEST_FOLDER_PATH="googletest-release-${GOOGLETEST_VERSION}"
+
 fi
 
 cmake_install() {