diff --git a/CMakeLists.txt b/CMakeLists.txt
index e07088af..528f5270 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.18.4)
+cmake_minimum_required(VERSION 3.16)
 
 project(candy LANGUAGES C CXX VERSION 6.0.4)
 
diff --git a/cmake/openssl/CMakeLists.txt b/cmake/openssl/CMakeLists.txt
index 11c65332..9cd1faa4 100644
--- a/cmake/openssl/CMakeLists.txt
+++ b/cmake/openssl/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.18.4)
+cmake_minimum_required(VERSION 3.16)
 if(POLICY CMP0135)
   cmake_policy(SET CMP0135 NEW)
 endif()
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index ba8f8ce9..c71b3cf1 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1,7 +1,7 @@
 aux_source_directory(. DIR_LIB_SRCS)
 add_library(core STATIC ${DIR_LIB_SRCS})
 
-set_target_properties(core PROPERTIES CXX_STANDARD 23)
+set_target_properties(core PROPERTIES CXX_STANDARD 17)
 
 if (${CANDY_STATIC_FMT})
     target_link_libraries(core PRIVATE fmt::fmt)
diff --git a/src/ffi/CMakeLists.txt b/src/ffi/CMakeLists.txt
index 2d6ce599..310e6fb2 100644
--- a/src/ffi/CMakeLists.txt
+++ b/src/ffi/CMakeLists.txt
@@ -2,7 +2,7 @@ aux_source_directory(. DIR_SRCS)
 add_library(${CANDY_LIBRARY_NAME} STATIC ${DIR_SRCS})
 
 set_target_properties(${CANDY_LIBRARY_NAME} PROPERTIES OUTPUT_NAME ${CANDY_EXECUTE_NAME})
-set_target_properties(${CANDY_LIBRARY_NAME} PROPERTIES CXX_STANDARD 23)
+set_target_properties(${CANDY_LIBRARY_NAME} PROPERTIES CXX_STANDARD 17)
 
 target_link_libraries(${CANDY_LIBRARY_NAME} PRIVATE core)
 target_link_libraries(${CANDY_LIBRARY_NAME} PRIVATE websocket)
diff --git a/src/main/CMakeLists.txt b/src/main/CMakeLists.txt
index 47b2210a..b82f5d7e 100644
--- a/src/main/CMakeLists.txt
+++ b/src/main/CMakeLists.txt
@@ -1,12 +1,7 @@
 aux_source_directory(. DIR_SRCS)
 add_executable(${CANDY_EXECUTE_NAME} ${DIR_SRCS})
 
-set_target_properties(${CANDY_EXECUTE_NAME} PROPERTIES CXX_STANDARD 23)
-
-find_library(STDCPPFS_LIB stdc++fs)
-if(STDCPPFS_LIB)
-    target_link_libraries(${CANDY_EXECUTE_NAME} PRIVATE ${STDCPPFS_LIB})
-endif()
+set_target_properties(${CANDY_EXECUTE_NAME} PROPERTIES CXX_STANDARD 17)
 
 if (${CANDY_STATIC_SPDLOG})
     target_link_libraries(${CANDY_EXECUTE_NAME} PRIVATE spdlog::spdlog)
diff --git a/src/peer/CMakeLists.txt b/src/peer/CMakeLists.txt
index f7865602..f607ccd7 100644
--- a/src/peer/CMakeLists.txt
+++ b/src/peer/CMakeLists.txt
@@ -1,7 +1,7 @@
 aux_source_directory(. DIR_LIB_SRCS)
 add_library(peer STATIC ${DIR_LIB_SRCS})
 
-set_target_properties(peer PROPERTIES CXX_STANDARD 23)
+set_target_properties(peer PROPERTIES CXX_STANDARD 17)
 
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
     target_link_libraries(peer PRIVATE ws2_32)
diff --git a/src/tun/CMakeLists.txt b/src/tun/CMakeLists.txt
index 38a9530a..1cb9be91 100644
--- a/src/tun/CMakeLists.txt
+++ b/src/tun/CMakeLists.txt
@@ -1,7 +1,7 @@
 aux_source_directory(. DIR_LIB_SRCS)
 add_library(tun STATIC ${DIR_LIB_SRCS})
 
-set_target_properties(tun PROPERTIES CXX_STANDARD 23)
+set_target_properties(tun PROPERTIES CXX_STANDARD 17)
 
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
     target_link_libraries(tun PRIVATE iphlpapi)
diff --git a/src/utils/CMakeLists.txt b/src/utils/CMakeLists.txt
index 64099906..2fbcad18 100644
--- a/src/utils/CMakeLists.txt
+++ b/src/utils/CMakeLists.txt
@@ -1,7 +1,7 @@
 aux_source_directory(. DIR_LIB_SRCS)
 add_library(utils STATIC ${DIR_LIB_SRCS})
 
-set_target_properties(utils PROPERTIES CXX_STANDARD 23)
+set_target_properties(utils PROPERTIES CXX_STANDARD 17)
 
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
     target_link_libraries(utils PRIVATE ws2_32)
diff --git a/src/websocket/CMakeLists.txt b/src/websocket/CMakeLists.txt
index a07fbac6..b880cf89 100644
--- a/src/websocket/CMakeLists.txt
+++ b/src/websocket/CMakeLists.txt
@@ -1,7 +1,7 @@
 aux_source_directory(. DIR_LIB_SRCS)
 add_library(websocket STATIC ${DIR_LIB_SRCS})
 
-set_target_properties(websocket PROPERTIES CXX_STANDARD 23)
+set_target_properties(websocket PROPERTIES CXX_STANDARD 17)
 
 if (${CANDY_STATIC_SPDLOG})
     target_link_libraries(websocket PRIVATE spdlog::spdlog)