diff --git a/upstream_utils/fmt-dont-throw-on-write-failure.patch b/upstream_utils/fmt-dont-throw-on-write-failure.patch
new file mode 100644
index 0000000000..6be3639810
--- /dev/null
+++ b/upstream_utils/fmt-dont-throw-on-write-failure.patch
@@ -0,0 +1,42 @@
+diff --git a/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h b/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
+index 2c51c50ae..cc89abdd3 100644
+--- a/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
++++ b/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
+@@ -92,8 +92,7 @@ FMT_FUNC void report_error(format_func func, int error_code,
+ // A wrapper around fwrite that throws on error.
+ inline void fwrite_fully(const void* ptr, size_t size, size_t count,
+                          FILE* stream) {
+-  size_t written = std::fwrite(ptr, size, count, stream);
+-  if (written < count) FMT_THROW(system_error(errno, "cannot write to file"));
++  std::fwrite(ptr, size, count, stream);
+ }
+ 
+ #ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+diff --git a/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h b/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
+index 55825077f..9acb893fa 100644
+--- a/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
++++ b/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
+@@ -207,8 +207,7 @@ inline void vprint(std::FILE* f, wstring_view fmt, wformat_args args) {
+   wmemory_buffer buffer;
+   detail::vformat_to(buffer, fmt, args);
+   buffer.push_back(L'\0');
+-  if (std::fputws(buffer.data(), f) == -1)
+-    FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
++  std::fputws(buffer.data(), f);
+ }
+ 
+ inline void vprint(wstring_view fmt, wformat_args args) {
+diff --git a/wpiutil/src/main/native/fmtlib/src/os.cpp b/wpiutil/src/main/native/fmtlib/src/os.cpp
+index 04b4dc506..4eb3e1fdd 100644
+--- a/wpiutil/src/main/native/fmtlib/src/os.cpp
++++ b/wpiutil/src/main/native/fmtlib/src/os.cpp
+@@ -277,8 +277,7 @@ std::size_t file::read(void* buffer, std::size_t count) {
+ std::size_t file::write(const void* buffer, std::size_t count) {
+   rwresult result = 0;
+   FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));
+-  if (result < 0) FMT_THROW(system_error(errno, "cannot write to file"));
+-  return detail::to_unsigned(result);
++  return count;
+ }
+ 
+ file file::dup(int fd) {
diff --git a/upstream_utils/update_fmt.py b/upstream_utils/update_fmt.py
index 8e4219c50c..f752b3d371 100755
--- a/upstream_utils/update_fmt.py
+++ b/upstream_utils/update_fmt.py
@@ -3,7 +3,7 @@
 import os
 import shutil
 
-from upstream_utils import setup_upstream_repo, comment_out_invalid_includes, walk_cwd_and_copy_if
+from upstream_utils import setup_upstream_repo, comment_out_invalid_includes, walk_cwd_and_copy_if, apply_patches
 
 
 def main():
@@ -31,6 +31,9 @@ def main():
         comment_out_invalid_includes(
             f, [os.path.join(wpiutil, "src/main/native/fmtlib/include")])
 
+    apply_patches(root,
+                  ["upstream_utils/fmt-dont-throw-on-write-failure.patch"])
+
 
 if __name__ == "__main__":
     main()
diff --git a/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h b/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
index 2c51c50aeb..cc89abdd3d 100644
--- a/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
+++ b/wpiutil/src/main/native/fmtlib/include/fmt/format-inl.h
@@ -92,8 +92,7 @@ FMT_FUNC void report_error(format_func func, int error_code,
 // A wrapper around fwrite that throws on error.
 inline void fwrite_fully(const void* ptr, size_t size, size_t count,
                          FILE* stream) {
-  size_t written = std::fwrite(ptr, size, count, stream);
-  if (written < count) FMT_THROW(system_error(errno, "cannot write to file"));
+  std::fwrite(ptr, size, count, stream);
 }
 
 #ifndef FMT_STATIC_THOUSANDS_SEPARATOR
diff --git a/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h b/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
index 55825077f8..9acb893fa7 100644
--- a/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
+++ b/wpiutil/src/main/native/fmtlib/include/fmt/xchar.h
@@ -207,8 +207,7 @@ inline void vprint(std::FILE* f, wstring_view fmt, wformat_args args) {
   wmemory_buffer buffer;
   detail::vformat_to(buffer, fmt, args);
   buffer.push_back(L'\0');
-  if (std::fputws(buffer.data(), f) == -1)
-    FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
+  std::fputws(buffer.data(), f);
 }
 
 inline void vprint(wstring_view fmt, wformat_args args) {
diff --git a/wpiutil/src/main/native/fmtlib/src/os.cpp b/wpiutil/src/main/native/fmtlib/src/os.cpp
index 04b4dc5060..4eb3e1fdd6 100644
--- a/wpiutil/src/main/native/fmtlib/src/os.cpp
+++ b/wpiutil/src/main/native/fmtlib/src/os.cpp
@@ -277,8 +277,7 @@ std::size_t file::read(void* buffer, std::size_t count) {
 std::size_t file::write(const void* buffer, std::size_t count) {
   rwresult result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));
-  if (result < 0) FMT_THROW(system_error(errno, "cannot write to file"));
-  return detail::to_unsigned(result);
+  return count;
 }
 
 file file::dup(int fd) {