diff --git a/.templates/.clangd b/.templates/.clangd
index 2ddd902..49b09ce 100644
--- a/.templates/.clangd
+++ b/.templates/.clangd
@@ -1,2 +1,2 @@
 CompileFlags:
-  Add: [-pthread, -std=c++20, -I%%%CURRENT_DIR%%%/src, -I%%%GLOBAL_WORKING_DIR%%%/morm/src, -I/usr/include, -I/usr/local/include, -DPT_HAS_MORM_LIBRARY]
+  Add: [-pthread, -std=c++23, -I%%%CURRENT_DIR%%%/src, -I%%%GLOBAL_WORKING_DIR%%%/morm/src, -I/usr/include, -I/usr/local/include, -DPT_HAS_MORM_LIBRARY]
diff --git a/.templates/.qtcreator/pikotools.cflags b/.templates/.qtcreator/pikotools.cflags
index 594bcef..836a2f4 100644
--- a/.templates/.qtcreator/pikotools.cflags
+++ b/.templates/.qtcreator/pikotools.cflags
@@ -1 +1 @@
--std=c20
+-std=c23
diff --git a/.templates/.qtcreator/pikotools.cxxflags b/.templates/.qtcreator/pikotools.cxxflags
index e23b2ae..ebae601 100644
--- a/.templates/.qtcreator/pikotools.cxxflags
+++ b/.templates/.qtcreator/pikotools.cxxflags
@@ -1 +1 @@
--std=c++20
+-std=c++23
diff --git a/.templates/install_clangd.sh b/.templates/install_clangd.sh
index 6483581..a836768 100755
--- a/.templates/install_clangd.sh
+++ b/.templates/install_clangd.sh
@@ -5,6 +5,14 @@ GLOBAL_WORKING_DIR=$(realpath ${CURRENT_DIR}/..)
 
 # ----------
 
+has_force_arg=0
+
+if [ $# -eq 1 ] ; then
+	if [ $1 == 'force' ] ; then
+		has_force_arg=1
+	fi
+fi
+
 # make sure the current directory is correct
 if [ ! -d ${CURRENT_DIR}/.templates ] ; then
 	echo "this script should be called by make: make clangd (one level up)"
@@ -17,7 +25,7 @@ GLOBAL_WORKING_DIR_FOR_SED=$(echo ${GLOBAL_WORKING_DIR} | sed 's/\//\\\//g')
 
 
 if [ -f "${CURRENT_DIR}/.templates/.clangd" ] ; then
-	if [ ! -f "${CURRENT_DIR}/.clangd" ] ; then
+	if [ $has_force_arg -eq 1 -o ! -f "${CURRENT_DIR}/.clangd" ] ; then
 		cat "${CURRENT_DIR}/.templates/.clangd" | \
 			sed -e "s/%%%CURRENT_DIR%%%/${CURRENT_DIR_FOR_SED}/g" \
 				-e "s/%%%GLOBAL_WORKING_DIR%%%/${GLOBAL_WORKING_DIR_FOR_SED}/g" > \
diff --git a/.templates/install_qtcreator.sh b/.templates/install_qtcreator.sh
index 6dfa2bf..ebe49dc 100755
--- a/.templates/install_qtcreator.sh
+++ b/.templates/install_qtcreator.sh
@@ -6,6 +6,14 @@ QTCREATOR_DIR=${CURRENT_DIR}/.qtcreator
 
 # ----------
 
+has_force_arg=0
+
+if [ $# -eq 1 ] ; then
+	if [ $1 == 'force' ] ; then
+		has_force_arg=1
+	fi
+fi
+
 # make sure the current directory is correct
 if [ ! -d ${CURRENT_DIR}/.templates ] ; then
 	echo "this script should be called by make: make qtcreator (one level up)"
@@ -48,6 +56,10 @@ GLOBAL_WORKING_DIR_FOR_SED=$(echo ${GLOBAL_WORKING_DIR} | sed 's/\//\\\//g')
 
 was_qtcreator_dir=0
 
+if [ $has_force_arg -eq 1 ] ; then
+	rm -rf "${QTCREATOR_DIR}"
+fi
+
 if [ -d "${QTCREATOR_DIR}" ] ; then
 	was_qtcreator_dir=1
 else
@@ -76,7 +88,7 @@ if [ -d "${QTCREATOR_DIR}" ] ; then
 
 			if [ $was_qtcreator_dir -eq 0 ] ; then
 				echo "QTCreator files generated to ${QTCREATOR_DIR} directory"
-				echo "select an 'open project...' option and find a ${QTCREATOR_DIR}/*.creator file"
+				echo "In QTCreator select an 'open project...' option and find a ${QTCREATOR_DIR}/*.creator file"
 			fi
 
 		fi
@@ -102,4 +114,3 @@ if [ -d "${QTCREATOR_DIR}" ] ; then
 
 fi
 
-
diff --git a/Makefile b/Makefile
index 9e3a0b0..2e575c5 100644
--- a/Makefile
+++ b/Makefile
@@ -17,29 +17,29 @@ tests: FORCE
 	$(MAKE) -C tests
 
 
-tests-gcc11: FORCE
-	env CXX=g++11 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc11/ -Wall -pedantic -O0 -g3 -std=c++20 -fmax-errors=1 -I../src -I/usr/local/include" $(MAKE) -C src
-	env CXX=g++11 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc11/ -Wall -pedantic -O0 -g3 -std=c++20 -fmax-errors=1 -I../src -I/usr/local/include" $(MAKE) -C tests
+tests-gcc15: FORCE
+	env CXX=g++15 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc15/ -Wall -pedantic -O0 -g3 -std=c++23 -fmax-errors=1 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=g++15 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc15/ -Wall -pedantic -O0 -g3 -std=c++23 -fmax-errors=1 -I../src -I/usr/local/include" $(MAKE) -C tests
 
 
 tests-clang: FORCE
-	env CXX=clang++ CXXFLAGS="-Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C src
-	env CXX=clang++ CXXFLAGS="-Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C tests
+	env CXX=clang++ CXXFLAGS="-Wall -pedantic -O0 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=clang++ CXXFLAGS="-Wall -pedantic -O0 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C tests
 
 
 tests-clang-sa: FORCE
-	env CXX=clang++ CXXFLAGS="-fsanitize=address -Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C src
-	env CXX=clang++ CXXFLAGS="-fsanitize=address -Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C tests
+	env CXX=clang++ CXXFLAGS="-fsanitize=address -Wall -pedantic -O0 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=clang++ CXXFLAGS="-fsanitize=address -Wall -pedantic -O0 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C tests
 
 
 tests-clang-sm: FORCE
-	env CXX=clang++ CXXFLAGS="-fsanitize=memory -Wall -pedantic -O3 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C src
-	env CXX=clang++ CXXFLAGS="-fsanitize=memory -Wall -pedantic -O3 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C tests
+	env CXX=clang++ CXXFLAGS="-fsanitize=memory -Wall -pedantic -O3 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=clang++ CXXFLAGS="-fsanitize=memory -Wall -pedantic -O3 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C tests
 
 
 tests-clang-su: FORCE
-	env CXX=clang++ CXXFLAGS="-fsanitize=undefined -Wall -pedantic -O3 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C src
-	env CXX=clang++ CXXFLAGS="-fsanitize=undefined -Wall -pedantic -O3 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C tests
+	env CXX=clang++ CXXFLAGS="-fsanitize=undefined -Wall -pedantic -O3 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=clang++ CXXFLAGS="-fsanitize=undefined -Wall -pedantic -O3 -g3 -std=c++23 -I../src -I/usr/local/include" $(MAKE) -C tests
 
 
 clean: FORCE
@@ -56,9 +56,17 @@ clangd: FORCE
 	@.templates/install_clangd.sh
 
 
+forceclangd: FORCE
+	@.templates/install_clangd.sh force
+
+
 qtcreator: clangd
 	@.templates/install_qtcreator.sh
 
 
+forceqtcreator: forceclangd
+	@.templates/install_qtcreator.sh force
+
+
 FORCE: