diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8969743..69afd69 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,7 +70,7 @@ endif()
 if (CLI_UseBoostAsio)
     set(Boost_NO_BOOST_CMAKE ON)
     add_definitions( -DBOOST_ALL_NO_LIB ) # for windows
-    find_package(Boost 1.55 REQUIRED COMPONENTS system)
+    find_package(Boost 1.66 REQUIRED COMPONENTS system)
 endif()
 
 if (CLI_UseStandaloneAsio)
@@ -155,4 +155,4 @@ if(NOT CMAKE_SKIP_INSTALL_RULES)
         FILES "${CMAKE_CURRENT_BINARY_DIR}/cli.pc"
         DESTINATION ${PKGCONFIG_INSTALL_DIR}
     )
-endif()
\ No newline at end of file
+endif()
diff --git a/README.md b/README.md
index c48b9a5..e31d83d 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ A cross-platform header only C++14 library for interactive command line interfac
 
 The library has no dependencies if you don't need remote sessions.
 
-The library depends on asio (either the standalone version or the boost version)
+The library depends on asio (either the standalone version or the boost version >= 1.66)
 *only* to provide telnet server (i.e., remote sessions).
 
 ## Installation
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index d0942e0..669b777 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -37,7 +37,7 @@ set(Boost_NO_BOOST_CMAKE ON)
 add_definitions( -DBOOST_ALL_NO_LIB ) # for windows
 
 # finds boost, triggers an error otherwise
-find_package(Boost 1.55 REQUIRED COMPONENTS unit_test_framework)
+find_package(Boost 1.66 REQUIRED COMPONENTS unit_test_framework system)
 
 # finds standalone asio, triggers an error otherwise
 find_path(STANDALONE_ASIO_INCLUDE_PATH NAMES "asio.hpp" HINTS ${ASIO_INCLUDEDIR})
@@ -66,7 +66,7 @@ target_include_directories(test_suite SYSTEM PRIVATE ${Boost_INCLUDE_DIRS})
 # indicates the shared library variant
 target_compile_definitions(test_suite PRIVATE "BOOST_TEST_DYN_LINK=1")
 # indicates the link paths
-target_link_libraries(test_suite ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY} standalone_asio_test cli::cli)
+target_link_libraries(test_suite ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY} Boost::system standalone_asio_test cli::cli)
 
 # declares a test with our executable
 add_test(NAME cli_test COMMAND test_suite)