diff --git a/.gitignore b/.gitignore
index 23c287a..bccf008 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,6 +52,7 @@ compile_commands.json
 *creator.user*
 
 build/
+.cache/
 local_docs/
 CMakeCache.txt
 CMakeFiles/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b20d08c..e525b12 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.16)
 
-project(CoreTemplateStd VERSION 1.0.0 LANGUAGES CXX)
+project(CoreTemplateStd VERSION 0.5.2 LANGUAGES CXX)
 
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
@@ -24,8 +24,16 @@ option(CORETEMPLATE_BUILD_EXAMPLE "Build the example application" ON)
 option(CORETEMPLATE_BUILD_TESTS "Build the test suite" OFF)
 option(CORETEMPLATE_BUILD_QT_ADAPTER "Build the optional Qt adapter target" OFF)
 option(CORETEMPLATE_BUILD_QT_GUI_EXAMPLE "Build the optional Qt Widgets GUI example" ON)
+option(CORETEMPLATE_ENABLE_UNSAFE_FORCE_TERMINATION "Deprecated: unsafe native thread termination is no longer exposed by Core" OFF)
 option(CORETEMPLATE_ENABLE_SANITIZERS "Enable AddressSanitizer and UndefinedBehaviorSanitizer for local test and example targets" OFF)
 
+if(CORETEMPLATE_ENABLE_UNSAFE_FORCE_TERMINATION)
+    message(DEPRECATION
+        "CORETEMPLATE_ENABLE_UNSAFE_FORCE_TERMINATION is deprecated. "
+        "Core now uses cooperative cancellation only; this option will be removed in the next major release."
+    )
+endif()
+
 if(CORETEMPLATE_ENABLE_SANITIZERS)
     if(MSVC)
         message(WARNING "CORETEMPLATE_ENABLE_SANITIZERS is not configured for MSVC")