diff --git a/CMakeLists.txt b/CMakeLists.txt
index a70b2879..6e80b7e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.18)
+cmake_minimum_required(VERSION 3.16)
 
 # Make CMAKE_C_VISIBILITY_PRESET work properly.
 set(CMAKE_POLICY_DEFAULT_CMP0063 NEW)
diff --git a/sample/CMakeLists.txt b/sample/CMakeLists.txt
index e284ff78..d30cbee7 100644
--- a/sample/CMakeLists.txt
+++ b/sample/CMakeLists.txt
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.18)
+cmake_minimum_required(VERSION 3.16)
 
 # INTERPROCEDURAL_OPTIMIZATION is enforced when enabled.
 set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)