diff --git a/ThirdParty/custom-surfio/CMakeLists.txt b/ThirdParty/custom-surfio/CMakeLists.txt
index 70e6776b31..86c3a86bf3 100644
--- a/ThirdParty/custom-surfio/CMakeLists.txt
+++ b/ThirdParty/custom-surfio/CMakeLists.txt
@@ -16,6 +16,10 @@ if(NOT mdspan_POPULATED)
   add_subdirectory(${mdspan_SOURCE_DIR} ${mdspan_BINARY_DIR} EXCLUDE_FROM_ALL)
 endif()
 
+# surfio uses parse_number/parse_number.h which falls back to fast_float
+# when std::from_chars for floats is not available. fast_float is provided via vcpkg.
+find_package(FastFloat CONFIG REQUIRED)
+
 # surfio_lib
 set(SRC_PATH "${CMAKE_CURRENT_LIST_DIR}/surfio/src/lib")
 add_library(surfio_lib)
@@ -32,5 +36,7 @@ target_include_directories(
   PRIVATE ../mio
 )
 
-target_link_libraries(surfio_lib PUBLIC mdspan)
+target_compile_definitions(surfio_lib PRIVATE STD_FROM_CHARS_FLOAT_SUPPORT=0)
+
+target_link_libraries(surfio_lib PUBLIC mdspan PRIVATE FastFloat::fast_float)
 
diff --git a/ThirdParty/custom-surfio/surfio b/ThirdParty/custom-surfio/surfio
index 255ff96fe2..14e3fc39f4 160000
--- a/ThirdParty/custom-surfio/surfio
+++ b/ThirdParty/custom-surfio/surfio
@@ -1 +1 @@
-Subproject commit 255ff96fe28e86b634c3e9ccebc08af3c9aa2a3d
+Subproject commit 14e3fc39f4531c9183d50d0e9039f420c10510e4