diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index 4a2a027..b5e19ce 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -32,16 +32,16 @@ jobs:
   test_library:
     uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
     with:
-      compilers: '["gcc-11", "clang-14"]'
+      compilers: '["gcc-14", "clang-18"]'
 
   integration_tests:
     uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
     with:
-      compilers: '["gcc-11", "clang-14"]'
+      compilers: '["gcc-14", "clang-18"]'
       repo_toolchain: '.github/integration_testing.cmake'
 
   # tamm_tests:
   #   uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
   #   with:
-  #     compilers: '["gcc-11"]'
+  #     compilers: '["gcc-14"]'
   #     repo_toolchain: '.github/tamm_testing.cmake'
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f8a07e..59e15e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ cmake_minimum_required(VERSION 3.14)
 #include(get_version_from_git)
 #get_version_from_git(scf_version "${CMAKE_CURRENT_LIST_DIR}")
 project(scf VERSION "1.0.0" LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 20)
 include(cmake/get_nwx_cmake.cmake)
 include(nwx_versions)
 include(get_cmaize)