diff --git a/tests/subsys/cpp/libcxx/prj.conf b/tests/subsys/cpp/libcxx/prj.conf
index 410215c579a..9d5040e5c49 100644
--- a/tests/subsys/cpp/libcxx/prj.conf
+++ b/tests/subsys/cpp/libcxx/prj.conf
@@ -3,3 +3,4 @@ CONFIG_LIB_CPLUSPLUS=y
 CONFIG_STD_CPP17=y
 CONFIG_ZTEST=y
 CONFIG_ZTEST_STACK_SIZE=5120
+CONFIG_ZTEST_NEW_API=y
diff --git a/tests/subsys/cpp/libcxx/src/main.cpp b/tests/subsys/cpp/libcxx/src/main.cpp
index feb6896382c..2ae446b622b 100644
--- a/tests/subsys/cpp/libcxx/src/main.cpp
+++ b/tests/subsys/cpp/libcxx/src/main.cpp
@@ -15,7 +15,7 @@ BUILD_ASSERT(__cplusplus == 201703);
 std::array<int, 4> array = {1, 2, 3, 4};
 std::vector<int> vector;
 
-static void test_array(void)
+ZTEST(libcxx_tests, test_array)
 {
 	zassert_equal(array.size(), 4, "unexpected size");
 	zassert_equal(array[0], 1, "array[0] wrong");
@@ -27,7 +27,7 @@ static void test_array(void)
 	zassert_equal(local[1], 2, "local[1] wrong");
 }
 
-static void test_vector(void)
+ZTEST(libcxx_tests, test_vector)
 {
 	zassert_equal(vector.size(), 0, "vector init nonzero");
 	for (auto v : array) {
@@ -53,7 +53,7 @@ struct make_unique_data {
 int make_unique_data::ctors;
 int make_unique_data::dtors;
 
-static void test_make_unique(void)
+ZTEST(libcxx_tests, test_make_unique)
 {
 	zassert_equal(make_unique_data::ctors, 0, "ctor count not initialized");
 	zassert_equal(make_unique_data::dtors, 0, "dtor count not initialized");
@@ -73,7 +73,7 @@ static void throw_exception(void)
 	throw 42;
 }
 
-static void test_exception(void)
+ZTEST(libcxx_tests, test_exception)
 {
 	try
 	{
@@ -89,20 +89,16 @@ static void test_exception(void)
 }
 #else
 
-static void test_exception(void)
+ZTEST(libcxx_tests, test_exception)
 {
 	ztest_test_skip();
 }
 #endif
 
-void test_main(void)
+static void *libcxx_tests_setup(void)
 {
 	TC_PRINT("version %u\n", (uint32_t)__cplusplus);
-	ztest_test_suite(libcxx_tests,
-			 ztest_unit_test(test_array),
-			 ztest_unit_test(test_vector),
-			 ztest_unit_test(test_make_unique),
-			 ztest_unit_test(test_exception)
-		);
-	ztest_run_test_suite(libcxx_tests);
+
+	return NULL;
 }
+ZTEST_SUITE(libcxx_tests, NULL, libcxx_tests_setup, NULL, NULL, NULL);