diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba52fad..6e628d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -265,7 +265,8 @@
     set (CMAKE_PREFIX_PATH ${CMAKE_BINARY_DIR}/prefix ${CMAKE_PREFIX_PATH})
 endif ()
 
-find_package (Boost 1.71 REQUIRED)
+find_package (Boost 1.73 REQUIRED)
+message (BOOST_VERSION = ${Boost_VERSION})
 include_directories (SYSTEM ${BOOST_SRC_DIR})
 
 # add_definitions(-DBOOST_ASIO_ENABLE_HANDLER_TRACKING)
@@ -273,10 +274,7 @@
 add_definitions (-DBOOST_BEAST_USE_STD_STRING_VIEW)
 add_definitions (-DBOOST_ERROR_CODE_HEADER_ONLY)
 add_definitions (-DBOOST_SYSTEM_NO_DEPRECATED)
-message (BOOST_VERSION = ${Boost_VERSION})
-if ("${Boost_VERSION}" STREQUAL "107100")
-    add_definitions (-DBOOST_ASIO_NO_DEPRECATED)
-endif ()
+add_definitions (-DBOOST_ASIO_NO_DEPRECATED)
 add_definitions (-DBOOST_ALL_NO_LIB)
 add_definitions (-DBOOST_NO_RTTI)
 add_definitions (-DBOOST_NO_TYPEID)
diff --git a/CMakeLists.txt.in b/CMakeLists.txt.in
index c25df8b..d14910f 100644
--- a/CMakeLists.txt.in
+++ b/CMakeLists.txt.in
@@ -36,8 +36,8 @@
 
 externalproject_add (
     Boost URL
-    https://dl.bintray.com/boostorg/release/1.71.0/source/boost_1_71_0.tar.gz
-    URL_MD5 5f521b41b79bf8616582c4a8a2c10177 SOURCE_DIR
+    https://dl.bintray.com/boostorg/release/1.73.0/source/boost_1_73_0.tar.gz
+    URL_MD5 4036cd27ef7548b8d29c30ea10956196 SOURCE_DIR
     "${CMAKE_BINARY_DIR}/boost-src" BINARY_DIR "${CMAKE_BINARY_DIR}/boost-build"
     CONFIGURE_COMMAND "" BUILD_COMMAND "" INSTALL_COMMAND mkdir -p
     "${CMAKE_BINARY_DIR}/prefix/include/" && cp -R