diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03513d4..43369e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.30)
+cmake_minimum_required(VERSION 3.28)
 project(UDBM VERSION 2.0.15 LANGUAGES CXX C)
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
diff --git a/cmake/boost.cmake b/cmake/boost.cmake
index ce7d4df..f6dc1b4 100644
--- a/cmake/boost.cmake
+++ b/cmake/boost.cmake
@@ -9,6 +9,9 @@ set(Boost_USE_STATIC_RUNTIME ON) # Mac insists on ON for boost_program_options
 #set(Boost_DEBUG ON)
 set(Boost_VERSION 1.86.0)
 
+if (POLICY CMP0167)
+  cmake_policy (SET CMP0167 NEW)
+endif ()
 if (BOOST_INCLUDE_LIBRARIES)
   find_package(Boost ${Boost_VERSION} COMPONENTS ${BOOST_INCLUDE_LIBRARIES} QUIET)
 else(BOOST_INCLUDE_LIBRARIES)
diff --git a/cmake/doctest.cmake b/cmake/doctest.cmake
index acbd69a..39196ed 100644
--- a/cmake/doctest.cmake
+++ b/cmake/doctest.cmake
@@ -1,4 +1,4 @@
-find_package(doctest 2.4.11 QUIET)
+find_package(doctest 2.5.2 QUIET)
 
 if (doctest_FOUND)
   if (TARGET doctest::doctest_with_main)
@@ -25,7 +25,7 @@ else(doctest_FOUND)
     FetchContent_Declare(
             doctest
             GIT_REPOSITORY https://github.com/doctest/doctest
-            GIT_TAG v2.4.11
+            GIT_TAG v2.5.2
             GIT_SHALLOW TRUE # get only the last commit version
             GIT_PROGRESS TRUE # show progress of download
             # FIND_PACKAGE_ARGS NAMES doctest
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 7dc05ec..4f7db19 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -14,6 +14,7 @@ foreach(source ${test_cpp_sources})
   get_filename_component(test_target ${source} NAME_WE)
   add_executable(${test_target} ${source})
   target_link_libraries(${test_target} ${libs} doctest_with_main)
+  target_compile_definitions(${test_target} PUBLIC DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN)
 endforeach()
 
 # comments contain expected time of Linux debug build, YMMV, whereas timeouts