diff --git a/examples/ex001-HelloWorld/CMakeLists.txt b/examples/ex001-HelloWorld/CMakeLists.txt
index 4d5dab2..b3d7a41 100644
--- a/examples/ex001-HelloWorld/CMakeLists.txt
+++ b/examples/ex001-HelloWorld/CMakeLists.txt
@@ -5,6 +5,11 @@ project(ex001-HelloWorld)
 set(CMAKE_MACOSX_RPATH 1)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_PROJECT_NAME}/deps")
 
+# C++ standard
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CXX_EXTENSIONS OFF)
+
 # julia is used to retrieve the CxxWrap library paths
 find_program(JULIA julia REQUIRED)
 
diff --git a/examples/ex001-HelloWorld/Makefile b/examples/ex001-HelloWorld/Makefile
index 2b35ac6..be99dc4 100644
--- a/examples/ex001-HelloWorld/Makefile
+++ b/examples/ex001-HelloWorld/Makefile
@@ -20,7 +20,7 @@ else
 CXXWRAP_PREFIX=$(shell mkdir -p $(BUILD_DIR); julia --project=$(BUILD_DIR) -e "import Pkg; Pkg.add(name=\"CxxWrap\", version=\"$(CXXWRAP_VERSION)\"); Pkg.resolve(); import CxxWrap; print(CxxWrap.prefix_path())")
 endif
 
-CXXWRAP_CPPFLAGS=-I $(CXXWRAP_PREFIX)/include -I . --std=c++17
+CXXWRAP_CPPFLAGS=-I $(CXXWRAP_PREFIX)/include -I . --std=c++20
 LDLIBS +=-L $(CXXWRAP_PREFIX)/lib -lcxxwrap_julia -lcxxwrap_julia_stl
 CXXFLAGS += -Wno-unused-variable -Wno-unused-but-set-variable