diff --git a/app/generation/cppng/templates/typing.h b/app/generation/cppng/templates/typing.h
index 1cb641c..cd47785 100644
--- a/app/generation/cppng/templates/typing.h
+++ b/app/generation/cppng/templates/typing.h
@@ -8,6 +8,7 @@
 #include <cstdint>
 #include <numeric>
 #include <span>
+#include <stdexcept>
 #include <string_view>
 
 #include "mp.h"
@@ -140,7 +141,7 @@ struct Encoding<T> {
     auto const ptr = std::bit_cast<element_type const*>(buffer);
     if constexpr (T::length > 1) {
       if constexpr (std::is_same_v<value_type, std::string_view>) {
-        std::string str(ptr, T::length);
+        std::string_view str(ptr, T::length);
         return str.substr(0, str.find('\0'));
       } else {
         return value_type(ptr, T::length);
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
index 24854fa..a2b28d0 100644
--- a/example/CMakeLists.txt
+++ b/example/CMakeLists.txt
@@ -1,13 +1,13 @@
 include(FetchContent)
 
 FetchContent_Declare(fmt
-  URL https://github.com/fmtlib/fmt/archive/refs/tags/9.1.0.tar.gz
+  URL https://github.com/fmtlib/fmt/archive/refs/tags/11.0.2.tar.gz
   DOWNLOAD_EXTRACT_TIMESTAMP ON
 )
 FetchContent_MakeAvailable(fmt)
 
 FetchContent_Declare(nlohmann_json
-  URL https://github.com/nlohmann/json/archive/refs/tags/v3.11.2.tar.gz
+  URL https://github.com/nlohmann/json/archive/refs/tags/v3.11.3.tar.gz
   DOWNLOAD_EXTRACT_TIMESTAMP ON
 )
 FetchContent_MakeAvailable(nlohmann_json)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 4a27c0b..b916998 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,7 +1,7 @@
 include(FetchContent)
 
 FetchContent_Declare(doctest
-  URL https://github.com/onqtam/doctest/archive/refs/tags/2.4.6.tar.gz
+  URL https://github.com/doctest/doctest/archive/refs/tags/v2.4.11.tar.gz
   DOWNLOAD_EXTRACT_TIMESTAMP ON
 )
 FetchContent_MakeAvailable(doctest)
@@ -14,6 +14,7 @@ function(AddTest NAME)
   cmake_parse_arguments(PARSED "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 
   add_executable(${NAME} ${PARSED_SOURCE})
+  target_compile_features(${NAME} PUBLIC cxx_std_20)
   target_compile_options(${NAME} PRIVATE -Wall -Wextra)
   target_link_libraries(${NAME} PRIVATE ${PARSED_LIBS})
   add_test(${NAME} ${NAME})
diff --git a/tests/basic-group-schema_test.cpp b/tests/basic-group-schema_test.cpp
index 6f292df..32597a6 100644
--- a/tests/basic-group-schema_test.cpp
+++ b/tests/basic-group-schema_test.cpp
@@ -12,7 +12,7 @@ TEST_CASE("basic-group-schema-test") {
   REQUIRE_EQ(TestMessage1::name(), "TestMessage1");
   REQUIRE_EQ(TestMessage1::id(), 1);
   REQUIRE_EQ(TestMessage1::sbeBlockLength(), 16);
-  REQUIRE_EQ(TestMessage1::fieldsCount(), 2);
+  REQUIRE_EQ(MP_Size<TestMessage1::Fields>(), 2);
   REQUIRE_EQ(TestMessage1::Entries::sbeBlockLength(), 28);
-  REQUIRE_EQ(TestMessage1::Entries::fieldsCount(), 2);
+  REQUIRE_EQ(MP_Size<TestMessage1::Entries::Fields>(), 2);
 }