diff --git a/tools/internal_ci/linux/grpc_bazel_on_foundry_base.sh b/tools/internal_ci/linux/grpc_bazel_on_foundry_base.sh
index 4a64b00..d2dded0 100755
--- a/tools/internal_ci/linux/grpc_bazel_on_foundry_base.sh
+++ b/tools/internal_ci/linux/grpc_bazel_on_foundry_base.sh
@@ -22,8 +22,8 @@
 cp ${KOKORO_GFILE_DIR}/GrpcTesting-d0eeee2db331.json ${KOKORO_KEYSTORE_DIR}/4321_grpc-testing-service
 
 temp_dir=$(mktemp -d)
-ln -f "${KOKORO_GFILE_DIR}/bazel-release-0.12.0" ${temp_dir}/bazel
-chmod 755 "${KOKORO_GFILE_DIR}/bazel-release-0.12.0"
+ln -f "${KOKORO_GFILE_DIR}/bazel-rc-0.14.0rc5" ${temp_dir}/bazel
+chmod 755 "${KOKORO_GFILE_DIR}/bazel-rc-0.14.0rc5"
 export PATH="${temp_dir}:${PATH}"
 # This should show ${temp_dir}/bazel
 which bazel
@@ -52,6 +52,9 @@
   --experimental_remote_platform_override='properties:{name:"container-image" value:"docker://gcr.io/cloud-marketplace/google/rbe-ubuntu16-04@sha256:59bf0e191a6b5cc1ab62c2224c810681d1326bad5a27b1d36c9f40113e79da7f" }' \
   --crosstool_top=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0/bazel_0.13.0/default:toolchain \
   --define GRPC_PORT_ISOLATED_RUNTIME=1 \
+  --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1 \
+  --extra_toolchains=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0/bazel_0.13.0/cpp:cc-toolchain-clang-x86_64-default \
+  --extra_execution_platforms=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604 \
   $1 \
   -- //test/... || FAILED="true"
 
diff --git a/tools/internal_ci/linux/grpc_msan_on_foundry.sh b/tools/internal_ci/linux/grpc_msan_on_foundry.sh
index de9319b..e8ef249 100644
--- a/tools/internal_ci/linux/grpc_msan_on_foundry.sh
+++ b/tools/internal_ci/linux/grpc_msan_on_foundry.sh
@@ -23,8 +23,8 @@
 cp ${KOKORO_GFILE_DIR}/GrpcTesting-d0eeee2db331.json ${KOKORO_KEYSTORE_DIR}/4321_grpc-testing-service
 
 temp_dir=$(mktemp -d)
-ln -f "${KOKORO_GFILE_DIR}/bazel-release-0.12.0" ${temp_dir}/bazel
-chmod 755 "${KOKORO_GFILE_DIR}/bazel-release-0.12.0"
+ln -f "${KOKORO_GFILE_DIR}/bazel-rc-0.14.0rc5" ${temp_dir}/bazel
+chmod 755 "${KOKORO_GFILE_DIR}/bazel-rc-0.14.0rc5"
 export PATH="${temp_dir}:${PATH}"
 # This should show ${temp_dir}/bazel
 which bazel
@@ -61,6 +61,9 @@
   --action_env=LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH \
   --host_crosstool_top=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0/bazel_0.13.0/default:toolchain \
   --crosstool_top=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0/bazel_0.13.0/msan:toolchain \
+  --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1 \
+  --extra_toolchains=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0/bazel_0.13.0/cpp:cc-toolchain-clang-x86_64-default \
+  --extra_execution_platforms=@com_github_bazelbuild_bazeltoolchains//configs/ubuntu16_04_clang/1.0:rbe_ubuntu1604 \
   -- //test/... || FAILED="true"
 
 # Sleep to let ResultStore finish writing results before querying