diff --git a/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt b/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
index 420b1aa6f..46861ebdc 100644
--- a/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
+++ b/vtkm/thirdparty/diy/vtkmdiy/CMakeLists.txt
@@ -143,7 +143,7 @@ function(add_diy_mpi_library use_mpi)
 
     add_library(${lib_name} ${sources})
     set_target_properties(${lib_name} PROPERTIES POSITION_INDEPENDENT_CODE ON)
-    target_compile_features(${lib_name} PRIVATE cxx_std_11)
+    target_compile_features(${lib_name} PRIVATE cxx_std_14)
     target_compile_definitions(${lib_name}
         PRIVATE -DVTKMDIY_HAS_MPI=${has_mpi_val}
         PRIVATE -Ddiy=${diy_prefix}         # mangle diy namespace
@@ -186,7 +186,7 @@ if (build_diy_mpi_lib)
 endif() # build_diy_mpi_lib
 
 add_library(${diy_prefix} INTERFACE)
-target_compile_features(${diy_prefix} INTERFACE cxx_std_11)
+target_compile_features(${diy_prefix} INTERFACE cxx_std_14)
 target_compile_definitions(${diy_prefix} INTERFACE ${diy_definitions})
 target_include_directories(${diy_prefix} SYSTEM INTERFACE
     "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"
diff --git a/vtkm/thirdparty/diy/vtkmdiy/include/vtkmdiy/thirdparty/fmt/format.h b/vtkm/thirdparty/diy/vtkmdiy/include/vtkmdiy/thirdparty/fmt/format.h
index dcf4a3998..ce5d0695e 100644
--- a/vtkm/thirdparty/diy/vtkmdiy/include/vtkmdiy/thirdparty/fmt/format.h
+++ b/vtkm/thirdparty/diy/vtkmdiy/include/vtkmdiy/thirdparty/fmt/format.h
@@ -850,7 +850,7 @@ inline Char* format_uint(Char* buffer, UInt value, int num_digits,
   buffer += num_digits;
   Char* end = buffer;
   do {
-    const char* digits = upper ? "0123456789ABCDEF" : data::hex_digits;
+    const char* digits = upper ? "0123456789ABCDEF" : "0123456789abcdef";
     unsigned digit = (value & ((1 << BASE_BITS) - 1));
     *--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit)
                                                 : digits[digit]);