diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fff94dc..8eb8fedf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,15 +24,8 @@
 # LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 # OF THIS SOFTWARE.
 
-cmake_minimum_required(VERSION 3.10)
-
-# Default policy is from 3.10
-cmake_policy(VERSION 3.10)
-
-if(POLICY CMP0074)
-  # Allow find_package() to use the ZLIB_ROOT variable, if available.
-  cmake_policy(SET CMP0074 NEW)
-endif()
+cmake_minimum_required(VERSION 3.20)
+cmake_policy(VERSION 3.20)
 
 # Find CMake modules in cmake/
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
diff --git a/build/test_cmake/CMakeLists.txt b/build/test_cmake/CMakeLists.txt
index d985ab2c..64d476e8 100644
--- a/build/test_cmake/CMakeLists.txt
+++ b/build/test_cmake/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9.0)
+cmake_minimum_required(VERSION 3.20.0)
 project(test)
 
 find_package(Tiff CONFIG REQUIRED)
diff --git a/build/test_cmake_no_target/CMakeLists.txt b/build/test_cmake_no_target/CMakeLists.txt
index 5e899025..007d4ded 100644
--- a/build/test_cmake_no_target/CMakeLists.txt
+++ b/build/test_cmake_no_target/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9.0)
+cmake_minimum_required(VERSION 3.20.0)
 project(test)
 
 find_package(Tiff CONFIG REQUIRED)