diff --git a/repos/spack_repo/builtin/packages/hpx/package.py b/repos/spack_repo/builtin/packages/hpx/package.py
index 6ca51d18ad8..ceeceb81ca0 100644
--- a/repos/spack_repo/builtin/packages/hpx/package.py
+++ b/repos/spack_repo/builtin/packages/hpx/package.py
@@ -47,7 +47,7 @@ class Hpx(CMakePackage, CudaPackage, ROCmPackage):
 
     generator("ninja")
 
-    cxxstds = ("11", "14", "17", "20")
+    cxxstds = ("11", "14", "17", "20", "23")
     variant(
         "cxxstd",
         default="17",