diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index 9de4067..7a6060d 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -32,4 +32,4 @@ jobs:
   test_library:
     uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
     with:
-      compilers: '["gcc-11", "clang-14"]'
+      compilers: '["gcc-14", "clang-18"]'
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e658957..00ca629 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,7 @@ include(cmake/get_nwx_cmake.cmake)
 include(get_version_from_git)
 get_version_from_git(simde_version "${CMAKE_CURRENT_LIST_DIR}")
 project(simde VERSION "${simde_version}" LANGUAGES CXX)
+set(CMAKE_CXX_STANDARD 20)
 
 include(nwx_versions)
 include(get_cmaize)