diff --git a/c++/app4triqs/CMakeLists.txt b/c++/app4triqs/CMakeLists.txt
index 7f566014..b9f32c96 100644
--- a/c++/app4triqs/CMakeLists.txt
+++ b/c++/app4triqs/CMakeLists.txt
@@ -49,7 +49,7 @@ if(ANALYZE_SOURCES)
 	TARGET ${PROJECT_NAME}_c
 	COMMAND ${CPPCHECK_EXECUTABLE}
 	  --enable=warning,style,performance,portability
-	  --std=c++17
+	  --std=c++20
 	  --template=gcc
 	  --verbose
 	  --force
diff --git a/test/c++/CMakeLists.txt b/test/c++/CMakeLists.txt
index 36466c39..14ac6ae1 100644
--- a/test/c++/CMakeLists.txt
+++ b/test/c++/CMakeLists.txt
@@ -24,7 +24,7 @@ foreach(test ${all_tests})
       TARGET ${test_name}
       COMMAND ${CPPCHECK_EXECUTABLE}
       --enable=warning,style,performance,portability
-      --std=c++17
+      --std=c++20
       --template=gcc
       --verbose
       --force