diff --git a/upstream_utils/fmt.py b/upstream_utils/fmt.py
index 9380eb1c22..abb671031c 100755
--- a/upstream_utils/fmt.py
+++ b/upstream_utils/fmt.py
@@ -35,7 +35,7 @@ def copy_upstream_src(wpilib_root):
 def main():
     name = "fmt"
     url = "https://github.com/fmtlib/fmt"
-    tag = "11.0.1"
+    tag = "11.0.2"
 
     fmt = Lib(name, url, tag, copy_upstream_src)
     fmt.main()
diff --git a/upstream_utils/fmt_patches/0001-Suppress-warnings-we-can-t-fix.patch b/upstream_utils/fmt_patches/0001-Suppress-warnings-we-can-t-fix.patch
index b528fd168e..5cd394af43 100644
--- a/upstream_utils/fmt_patches/0001-Suppress-warnings-we-can-t-fix.patch
+++ b/upstream_utils/fmt_patches/0001-Suppress-warnings-we-can-t-fix.patch
@@ -8,10 +8,10 @@ Subject: [PATCH] Suppress warnings we can't fix
  1 file changed, 7 insertions(+)
 
 diff --git a/include/fmt/format.h b/include/fmt/format.h
-index 7c2a19b4084de8f8bb9376d91c9a508f396e50df..ed372239a24466d32d5f81514efbdbe2ddafdba8 100644
+index 67f0ab739b0de55d03ab3e71424f1eb9e9c9bdfc..cf5ad9820683130ce9895f5d216d9b9efd0185ac 100644
 --- a/include/fmt/format.h
 +++ b/include/fmt/format.h
-@@ -1268,7 +1268,14 @@ inline auto equal2(const char* lhs, const char* rhs) -> bool {
+@@ -1276,7 +1276,14 @@ inline auto equal2(const char* lhs, const char* rhs) -> bool {
  template <typename Char>
  FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) {
    if (!is_constant_evaluated() && sizeof(Char) == sizeof(char)) {
diff --git a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/base.h b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/base.h
index f440cffd20..6276494253 100644
--- a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/base.h
+++ b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/base.h
@@ -23,7 +23,7 @@
 #endif
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 110001
+#define FMT_VERSION 110002
 
 // Detect compiler versions.
 #if defined(__clang__) && !defined(__ibmxl__)
@@ -441,7 +441,8 @@ struct is_std_string_like : std::false_type {};
 template <typename T>
 struct is_std_string_like<T, void_t<decltype(std::declval<T>().find_first_of(
                                  typename T::value_type(), 0))>>
-    : std::true_type {};
+    : std::is_convertible<decltype(std::declval<T>().data()),
+                          const typename T::value_type*> {};
 
 // Returns true iff the literal encoding is UTF-8.
 constexpr auto is_utf8_enabled() -> bool {
@@ -466,6 +467,7 @@ template <typename Char> FMT_CONSTEXPR auto length(const Char* s) -> size_t {
 template <typename Char>
 FMT_CONSTEXPR auto compare(const Char* s1, const Char* s2, std::size_t n)
     -> int {
+  if (!is_constant_evaluated() && sizeof(Char) == 1) return memcmp(s1, s2, n);
   for (; n != 0; ++s1, ++s2, --n) {
     if (*s1 < *s2) return -1;
     if (*s1 > *s2) return 1;
@@ -473,14 +475,22 @@ FMT_CONSTEXPR auto compare(const Char* s1, const Char* s2, std::size_t n)
   return 0;
 }
 
+namespace adl {
+using namespace std;
+
+template <typename Container>
+auto invoke_back_inserter()
+    -> decltype(back_inserter(std::declval<Container&>()));
+}  // namespace adl
+
 template <typename It, typename Enable = std::true_type>
 struct is_back_insert_iterator : std::false_type {};
+
 template <typename It>
 struct is_back_insert_iterator<
-    It,
-    bool_constant<std::is_same<
-        decltype(back_inserter(std::declval<typename It::container_type&>())),
-        It>::value>> : std::true_type {};
+    It, bool_constant<std::is_same<
+            decltype(adl::invoke_back_inserter<typename It::container_type>()),
+            It>::value>> : std::true_type {};
 
 // Extracts a reference to the container from *insert_iterator.
 template <typename OutputIt>
@@ -611,11 +621,12 @@ namespace detail {
 // to it, deducing Char. Explicitly convertible types such as the ones returned
 // from FMT_STRING are intentionally excluded.
 template <typename Char, FMT_ENABLE_IF(is_char<Char>::value)>
-auto to_string_view(const Char* s) -> basic_string_view<Char> {
+constexpr auto to_string_view(const Char* s) -> basic_string_view<Char> {
   return s;
 }
 template <typename T, FMT_ENABLE_IF(is_std_string_like<T>::value)>
-auto to_string_view(const T& s) -> basic_string_view<typename T::value_type> {
+constexpr auto to_string_view(const T& s)
+    -> basic_string_view<typename T::value_type> {
   return s;
 }
 template <typename Char>
@@ -919,12 +930,9 @@ template <typename T> class buffer {
       try_reserve(size_ + count);
       auto free_cap = capacity_ - size_;
       if (free_cap < count) count = free_cap;
-      if (std::is_same<T, U>::value) {
-        memcpy(ptr_ + size_, begin, count * sizeof(T));
-      } else {
-        T* out = ptr_ + size_;
-        for (size_t i = 0; i < count; ++i) out[i] = begin[i];
-      }
+      // A loop is faster than memcpy on small sizes.
+      T* out = ptr_ + size_;
+      for (size_t i = 0; i < count; ++i) out[i] = begin[i];
       size_ += count;
       begin += count;
     }
@@ -1157,6 +1165,7 @@ template <typename T> class basic_appender {
   using difference_type = ptrdiff_t;
   using pointer = T*;
   using reference = T&;
+  using container_type = detail::buffer<T>;
   FMT_UNCHECKED_ITERATOR(basic_appender);
 
   FMT_CONSTEXPR basic_appender(detail::buffer<T>& buf) : buffer_(&buf) {}
@@ -1173,6 +1182,8 @@ template <typename T> class basic_appender {
 using appender = basic_appender<char>;
 
 namespace detail {
+template <typename T>
+struct is_back_insert_iterator<basic_appender<T>> : std::true_type {};
 
 template <typename T, typename Enable = void>
 struct locking : std::true_type {};
@@ -1189,12 +1200,6 @@ FMT_CONSTEXPR inline auto is_locking() -> bool {
 }
 
 // An optimized version of std::copy with the output value type (T).
-template <typename T, typename InputIt>
-auto copy(InputIt begin, InputIt end, appender out) -> appender {
-  get_container(out).append(begin, end);
-  return out;
-}
-
 template <typename T, typename InputIt, typename OutputIt,
           FMT_ENABLE_IF(is_back_insert_iterator<OutputIt>::value)>
 auto copy(InputIt begin, InputIt end, OutputIt out) -> OutputIt {
@@ -1209,14 +1214,6 @@ FMT_CONSTEXPR auto copy(InputIt begin, InputIt end, OutputIt out) -> OutputIt {
   return out;
 }
 
-template <typename T>
-FMT_CONSTEXPR auto copy(const T* begin, const T* end, T* out) -> T* {
-  if (is_constant_evaluated()) return copy<T, const T*, T*>(begin, end, out);
-  auto size = to_unsigned(end - begin);
-  if (size > 0) memcpy(out, begin, size * sizeof(T));
-  return out + size;
-}
-
 template <typename T, typename V, typename OutputIt>
 FMT_CONSTEXPR auto copy(basic_string_view<V> s, OutputIt out) -> OutputIt {
   return copy<T>(s.begin(), s.end(), out);
@@ -1238,12 +1235,25 @@ constexpr auto has_const_formatter() -> bool {
   return has_const_formatter_impl<Context>(static_cast<T*>(nullptr));
 }
 
+template <typename It, typename Enable = std::true_type>
+struct is_buffer_appender : std::false_type {};
+template <typename It>
+struct is_buffer_appender<
+    It, bool_constant<
+            is_back_insert_iterator<It>::value &&
+            std::is_base_of<buffer<typename It::container_type::value_type>,
+                            typename It::container_type>::value>>
+    : std::true_type {};
+
 // Maps an output iterator to a buffer.
-template <typename T, typename OutputIt>
+template <typename T, typename OutputIt,
+          FMT_ENABLE_IF(!is_buffer_appender<OutputIt>::value)>
 auto get_buffer(OutputIt out) -> iterator_buffer<OutputIt, T> {
   return iterator_buffer<OutputIt, T>(out);
 }
-template <typename T> auto get_buffer(basic_appender<T> out) -> buffer<T>& {
+template <typename T, typename OutputIt,
+          FMT_ENABLE_IF(is_buffer_appender<OutputIt>::value)>
+auto get_buffer(OutputIt out) -> buffer<T>& {
   return get_container(out);
 }
 
@@ -1475,6 +1485,12 @@ template <typename Context> struct arg_mapper {
 
   FMT_MAP_API auto map(void* val) -> const void* { return val; }
   FMT_MAP_API auto map(const void* val) -> const void* { return val; }
+  FMT_MAP_API auto map(volatile void* val) -> const void* {
+    return const_cast<const void*>(val);
+  }
+  FMT_MAP_API auto map(const volatile void* val) -> const void* {
+    return const_cast<const void*>(val);
+  }
   FMT_MAP_API auto map(std::nullptr_t val) -> const void* { return val; }
 
   // Use SFINAE instead of a const T* parameter to avoid a conflict with the
@@ -1760,7 +1776,7 @@ template <typename Context> class basic_format_arg {
    * `vis(value)` will be called with the value of type `double`.
    */
   template <typename Visitor>
-  FMT_CONSTEXPR auto visit(Visitor&& vis) const -> decltype(vis(0)) {
+  FMT_CONSTEXPR FMT_INLINE auto visit(Visitor&& vis) const -> decltype(vis(0)) {
     switch (type_) {
     case detail::type::none_type:
       break;
diff --git a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format-inl.h b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format-inl.h
index 8d07cc6723..a887483b6f 100644
--- a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format-inl.h
+++ b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format-inl.h
@@ -1443,12 +1443,26 @@ template <typename T> struct span {
   size_t size;
 };
 
-#ifdef _WIN32
-inline void flockfile(FILE* f) { _lock_file(f); }
-inline void funlockfile(FILE* f) { _unlock_file(f); }
-inline int getc_unlocked(FILE* f) { return _fgetc_nolock(f); }
+template <typename F> auto flockfile(F* f) -> decltype(_lock_file(f)) {
+  _lock_file(f);
+}
+template <typename F> auto funlockfile(F* f) -> decltype(_unlock_file(f)) {
+  _unlock_file(f);
+}
+
+#ifndef getc_unlocked
+template <typename F> auto getc_unlocked(F* f) -> decltype(_fgetc_nolock(f)) {
+  return _fgetc_nolock(f);
+}
 #endif
 
+template <typename F = FILE, typename Enable = void>
+struct has_flockfile : std::false_type {};
+
+template <typename F>
+struct has_flockfile<F, void_t<decltype(flockfile(&std::declval<F&>()))>>
+    : std::true_type {};
+
 // A FILE wrapper. F is FILE defined as a template parameter to make system API
 // detection work.
 template <typename F> class file_base {
@@ -1619,7 +1633,15 @@ inline auto get_file(FILE* f, ...) -> fallback_file<FILE> { return f; }
 
 using file_ref = decltype(get_file(static_cast<FILE*>(nullptr), 0));
 
+template <typename F = FILE, typename Enable = void>
 class file_print_buffer : public buffer<char> {
+ public:
+  explicit file_print_buffer(F*) : buffer(nullptr, size_t()) {}
+};
+
+template <typename F>
+class file_print_buffer<F, enable_if_t<has_flockfile<F>::value>>
+    : public buffer<char> {
  private:
   file_ref file_;
 
@@ -1634,7 +1656,7 @@ class file_print_buffer : public buffer<char> {
   }
 
  public:
-  explicit file_print_buffer(FILE* f) : buffer(grow, size_t()), file_(f) {
+  explicit file_print_buffer(F* f) : buffer(grow, size_t()), file_(f) {
     flockfile(f);
     file_.init_buffer();
     auto buf = file_.get_write_buffer();
@@ -1643,7 +1665,8 @@ class file_print_buffer : public buffer<char> {
   ~file_print_buffer() {
     file_.advance_write_buffer(size());
     bool flush = file_.needs_flush();
-    funlockfile(file_);
+    F* f = file_;    // Make funlockfile depend on the template parameter F
+    funlockfile(f);  // for the system API detection to work.
     if (flush) fflush(file_);
   }
 };
@@ -1692,8 +1715,9 @@ FMT_FUNC void vprint_buffered(std::FILE* f, string_view fmt, format_args args) {
 }
 
 FMT_FUNC void vprint(std::FILE* f, string_view fmt, format_args args) {
-  if (!detail::file_ref(f).is_buffered()) return vprint_buffered(f, fmt, args);
-  auto&& buffer = detail::file_print_buffer(f);
+  if (!detail::file_ref(f).is_buffered() || !detail::has_flockfile<>())
+    return vprint_buffered(f, fmt, args);
+  auto&& buffer = detail::file_print_buffer<>(f);
   return detail::vformat_to(buffer, fmt, args);
 }
 
diff --git a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format.h b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format.h
index ed372239a2..cf5ad98206 100644
--- a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format.h
+++ b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/format.h
@@ -106,6 +106,13 @@
 #  define FMT_NOINLINE
 #endif
 
+namespace std {
+template <> struct iterator_traits<fmt::appender> {
+  using iterator_category = output_iterator_tag;
+  using value_type = char;
+};
+}  // namespace std
+
 #ifndef FMT_THROW
 #  if FMT_EXCEPTIONS
 #    if FMT_MSC_VERSION || defined(__NVCC__)
@@ -546,6 +553,7 @@ constexpr auto to_pointer(OutputIt, size_t) -> T* {
 template <typename T> auto to_pointer(basic_appender<T> it, size_t n) -> T* {
   buffer<T>& buf = get_container(it);
   auto size = buf.size();
+  buf.try_reserve(size + n);
   if (buf.capacity() < size + n) return nullptr;
   buf.try_resize(size + n);
   return buf.data() + size;
@@ -1119,7 +1127,7 @@ template <typename Char, typename Sign> constexpr auto sign(Sign s) -> Char {
 #if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604
   static_assert(std::is_same<Sign, sign_t>::value, "");
 #endif
-  return static_cast<Char>("\0-+ "[s]);
+  return static_cast<char>(((' ' << 24) | ('+' << 16) | ('-' << 8)) >> (s * 8));
 }
 
 template <typename T> FMT_CONSTEXPR auto count_digits_fallback(T n) -> int {
@@ -2324,15 +2332,13 @@ FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt {
   if (negative) abs_value = ~abs_value + 1;
   int num_digits = count_digits(abs_value);
   auto size = (negative ? 1 : 0) + static_cast<size_t>(num_digits);
-  auto it = reserve(out, size);
-  if (auto ptr = to_pointer<Char>(it, size)) {
+  if (auto ptr = to_pointer<Char>(out, size)) {
     if (negative) *ptr++ = static_cast<Char>('-');
     format_decimal<Char>(ptr, abs_value, num_digits);
     return out;
   }
-  if (negative) *it++ = static_cast<Char>('-');
-  it = format_decimal<Char>(it, abs_value, num_digits).end;
-  return base_iterator(out, it);
+  if (negative) *out++ = static_cast<Char>('-');
+  return format_decimal<Char>(out, abs_value, num_digits).end;
 }
 
 // DEPRECATED!
@@ -3636,9 +3642,7 @@ auto write(OutputIt out, monostate, format_specs = {}, locale_ref = {})
 template <typename Char, typename OutputIt>
 FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> value)
     -> OutputIt {
-  auto it = reserve(out, value.size());
-  it = copy_noinline<Char>(value.begin(), value.end(), it);
-  return base_iterator(out, it);
+  return copy_noinline<Char>(value.begin(), value.end(), out);
 }
 
 template <typename Char, typename OutputIt, typename T,
@@ -3979,15 +3983,19 @@ struct formatter<T, Char, enable_if_t<detail::has_format_as<T>::value>>
     : formatter<detail::format_as_t<T>, Char> {
   template <typename FormatContext>
   auto format(const T& value, FormatContext& ctx) const -> decltype(ctx.out()) {
-    using base = formatter<detail::format_as_t<T>, Char>;
     auto&& val = format_as(value);  // Make an lvalue reference for format.
-    return base::format(val, ctx);
+    return formatter<detail::format_as_t<T>, Char>::format(val, ctx);
   }
 };
 
-#define FMT_FORMAT_AS(Type, Base) \
-  template <typename Char>        \
-  struct formatter<Type, Char> : formatter<Base, Char> {}
+#define FMT_FORMAT_AS(Type, Base)                                              \
+  template <typename Char>                                                     \
+  struct formatter<Type, Char> : formatter<Base, Char> {                       \
+    template <typename FormatContext>                                          \
+    auto format(Type value, FormatContext& ctx) const -> decltype(ctx.out()) { \
+      return formatter<Base, Char>::format(value, ctx);                        \
+    }                                                                          \
+  }
 
 FMT_FORMAT_AS(signed char, int);
 FMT_FORMAT_AS(unsigned char, unsigned);
diff --git a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/ranges.h b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/ranges.h
index f387903cf6..0d3dfbd8d3 100644
--- a/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/ranges.h
+++ b/wpiutil/src/main/native/thirdparty/fmtlib/include/fmt/ranges.h
@@ -490,7 +490,7 @@ struct range_formatter<
     auto out = ctx.out();
     auto it = detail::range_begin(range);
     auto end = detail::range_end(range);
-    if (is_debug) return write_debug_string(out, it, end);
+    if (is_debug) return write_debug_string(out, std::move(it), end);
 
     out = detail::copy<Char>(opening_bracket_, out);
     int i = 0;