diff --git a/benchmark/0015.string/.test_prop.toml b/benchmark/0015.string/.test_prop.toml
index cae7b425..1dbff7c1 100644
--- a/benchmark/0015.string/.test_prop.toml
+++ b/benchmark/0015.string/.test_prop.toml
@@ -12,3 +12,6 @@ ignore = true
 
 ["scan_strlike.cc"] # TODO: CI runtime failed. why?
 ignore = true
+
+["trim_right_boost.cc"] # no need to install those env in CI
+ignore = true
diff --git a/benchmark/0015.string/trim_right_boost.cc b/benchmark/0015.string/trim_right_boost.cc
new file mode 100644
index 00000000..235294d9
--- /dev/null
+++ b/benchmark/0015.string/trim_right_boost.cc
@@ -0,0 +1,47 @@
+#include <fast_io_dsal/string.h>
+#include <fast_io.h>
+#include <fast_io_device.h>
+#include <fast_io_driver/timer.h>
+#include <cassert>
+#include <boost/algorithm/string.hpp>
+using namespace fast_io::io;
+
+int main()
+{
+	{
+		constexpr std::size_t N(40000000);
+		{
+			fast_io::timer t(u8"trim_right string");
+			fast_io::string str("    ok    someone like trim    ok    ");
+			for (std::size_t i{}; i != N; ++i)
+			{
+				str.push_back(' ');
+				str.push_back('\t');
+				str.push_back('\r');
+				str.push_back('\f');
+				str.push_back('\v');
+				str.push_back('\n');
+			}
+			boost::algorithm::trim_right(str);
+			assert(str == fast_io::string("    ok    someone like trim    ok"));
+		}
+	}
+	{
+		constexpr std::size_t N(40000000);
+		{
+			fast_io::timer t(u8"trim_right wstring");
+			fast_io::wstring str(L"    ok    someone like trim    ok    ");
+			for (std::size_t i{}; i != N; ++i)
+			{
+				str.push_back(u' ');
+				str.push_back(u'\t');
+				str.push_back(u'\r');
+				str.push_back(u'\f');
+				str.push_back(u'\v');
+				str.push_back(u'\n');
+			}
+			boost::algorithm::trim_right(str);
+			assert(str == fast_io::wstring(L"    ok    someone like trim    ok"));
+		}
+	}
+}