diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 03d2463f..47310bbf 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -13,47 +13,38 @@ defaults:
 jobs:
   build:
     runs-on: ubuntu-20.04
-    name: ${{ matrix.sys.compiler }} ${{ matrix.sys.version }}
+    name: ${{ matrix.sys.compiler }} ${{ matrix.sys.version }} ${{ matrix.sys.stdlib }}
     strategy:
       fail-fast: false
       matrix:
         sys:
-        - {compiler: clang, version: '15'}
-        - {compiler: clang, version: '16'}
-        - {compiler: gcc, version: '11'}
-        - {compiler: gcc, version: '13'}
+        - {compiler: clang, version: '16', config-flags: '', stdlib: 'libstdc++-13' }
+        # - {compiler: clang, version: '16', config-flags: '-DCMAKE_CXX_FLAGS=-stdlib=libc++', stdlib: 'libc++-17' }
+        - {compiler: clang, version: '17', config-flags: '', stdlib: 'libstdc++-13' }
+        # - {compiler: clang, version: '17', config-flags: '-DCMAKE_CXX_FLAGS=-stdlib=libc++', stdlib: 'libc++-17' }
+        - {compiler: gcc, version: '13', config-flags: '' }
 
     steps:
 
-    - name: Setup GCC
-      if: ${{ matrix.sys.compiler == 'gcc' }}
-      run: |
-        GCC_VERSION=${{ matrix.sys.version }}
-        sudo apt-get update
-        sudo apt-get --no-install-suggests --no-install-recommends install g++-$GCC_VERSION
-        CC=gcc-$GCC_VERSION
-        echo "CC=$CC" >> $GITHUB_ENV
-        CXX=g++-$GCC_VERSION
-        echo "CXX=$CXX" >> $GITHUB_ENV
 
-    - name: Setup clang
-      if: ${{ matrix.sys.compiler == 'clang' }}
-      run: |
-        LLVM_VERSION=${{ matrix.sys.version }}
-        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
-        if [[ $LLVM_VERSION -ge 13 ]]; then
-          sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-$LLVM_VERSION main" || exit 1
-        else
-          sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal main" || exit 1
-        fi || exit 1
-        sudo apt-get update || exit 1
-        sudo apt-get --no-install-suggests --no-install-recommends install clang-$LLVM_VERSION || exit 1
-        sudo apt-get --no-install-suggests --no-install-recommends install g++-9 g++-9-multilib || exit 1
-        sudo ln -s /usr/include/asm-generic /usr/include/asm
-        CC=clang-$LLVM_VERSION
-        echo "CC=$CC" >> $GITHUB_ENV
-        CXX=clang++-$LLVM_VERSION
-        echo "CXX=$CXX" >> $GITHUB_ENV
+    - name: Install GCC
+      if: matrix.sys.compiler == 'gcc'
+      uses: egor-tensin/setup-gcc@v1
+      with:
+        version: ${{matrix.sys.version}}
+        platform: x64
+
+    - name: Install LLVM and Clang
+      if: matrix.sys.compiler == 'clang'
+      uses: egor-tensin/setup-clang@v1
+      with:
+        version: ${{matrix.sys.version}}
+        platform: x64
+
+    - name: Install the specified standard library for clang
+      if: matrix.sys.compiler == 'clang'
+      run: sudo apt install ${{matrix.sys.stdlib}}-dev -y
+
 
     - name: Checkout code
       uses: actions/checkout@v3
@@ -67,10 +58,7 @@ jobs:
         cache-downloads: true
 
     - name: Configure using CMake
-      #      env:
-      #        CC: ${{ env.CC }}
-      #        CXX: ${{ env.CXX }}
-      run: cmake -G Ninja -Bbuild -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -DBUILD_TESTS=ON 
+      run: cmake -G Ninja -Bbuild ${{matrix.sys.config-flags}} -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -DBUILD_TESTS=ON
 
     - name: Install
       working-directory: build
diff --git a/.github/workflows/osx.yml b/.github/workflows/osx.yml
index 77489679..23ee2b6f 100644
--- a/.github/workflows/osx.yml
+++ b/.github/workflows/osx.yml
@@ -18,7 +18,6 @@ jobs:
       fail-fast: false
       matrix:
         os:
-        - 11
         - 12
 
     steps:
diff --git a/.gitignore b/.gitignore
index 9a8bc0f7..a2023b6b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,8 @@
 *.out
 *.app
 
+# Ignore build directory
+/build/
 
 # Ignore VSCODE specific options (unless we want to provide shortcuts to build and run, then delete these)
 /.vscode/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 87b73e74..ba220811 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.28)
+
+# This is better specified per target, but cmake keeps ignoring these language version
+# specification when building this project by itself, in particular the gnu extensions,
+# so here we go.
+# This will affects all following targets being defined.
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 project(sparrow CXX)
 
 set(SPARROW_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
@@ -53,6 +60,8 @@ target_include_directories(sparrow INTERFACE
     $<BUILD_INTERFACE:${SPARROW_INCLUDE_DIR}>
     $<INSTALL_INTERFACE:include>)
 
+# We do not use non-standard C++
+set_target_properties(sparrow PROPERTIES CMAKE_CXX_EXTENSIONS OFF)
 target_compile_features(sparrow INTERFACE cxx_std_20)
 
 if (BUILD_TESTS)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index b0ced9e7..f260447c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -14,6 +14,7 @@
 
 cmake_minimum_required(VERSION 3.8)
 
+
 if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
     project(sparrow-test CXX)
 
@@ -40,3 +41,7 @@ set(SPARROW_TESTS
 set(test_target "test_sparrow_lib")
 add_executable(${test_target} ${SPARROW_TESTS})
 target_link_libraries(${test_target} PRIVATE sparrow doctest::doctest)
+
+# We do not use non-standard C++
+set_target_properties(${test_target} PROPERTIES CMAKE_CXX_EXTENSIONS OFF)
+target_compile_features(${test_target} PRIVATE cxx_std_20)
diff --git a/test/main.cpp b/test/main.cpp
index 0f3979c7..a89b6f8a 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -15,3 +15,4 @@
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest/doctest.h"
 
+#include <format>