diff --git a/include/fmt/core.h b/include/fmt/core.h
index 0ea9ef43..ad037f8b 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -585,7 +585,9 @@ struct error_handler {
   constexpr error_handler(const error_handler&) = default;
 
   // This function is intentionally not constexpr to give a compile-time error.
-  FMT_NORETURN FMT_API void on_error(const char* message);
+  FMT_NORETURN FMT_API void on_error(const char* message) {
+    throw_format_error(message);
+  }
 };
 FMT_END_DETAIL_NAMESPACE
 
diff --git a/include/fmt/format-inl.h b/include/fmt/format-inl.h
index 9baf2ca1..fee13174 100644
--- a/include/fmt/format-inl.h
+++ b/include/fmt/format-inl.h
@@ -2341,12 +2341,6 @@ FMT_FUNC void report_system_error(int error_code,
   report_error(format_system_error, error_code, message);
 }
 
-// DEPRECATED!
-// This function is defined here and not inline for ABI compatiblity.
-FMT_FUNC void detail::error_handler::on_error(const char* message) {
-  throw_format_error(message);
-}
-
 FMT_FUNC std::string vformat(string_view fmt, format_args args) {
   // Don't optimize the "{}" case to keep the binary size small and because it
   // can be better optimized in fmt::format anyway.
diff --git a/include/fmt/format.h b/include/fmt/format.h
index 2c4145cf..73686c40 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -132,13 +132,6 @@ FMT_END_NAMESPACE
 #  endif
 #endif
 
-// Workaround broken [[deprecated]] in the Intel, PGI and NVCC compilers.
-#if FMT_ICC_VERSION || defined(__PGI) || FMT_NVCC
-#  define FMT_DEPRECATED_ALIAS
-#else
-#  define FMT_DEPRECATED_ALIAS FMT_DEPRECATED
-#endif
-
 #ifndef FMT_USE_USER_DEFINED_LITERALS
 // EDG based compilers (Intel, NVIDIA, Elbrus, etc), GCC and MSVC support UDLs.
 #  if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 407 || \
@@ -935,27 +928,6 @@ class FMT_API format_error : public std::runtime_error {
   ~format_error() noexcept override FMT_MSC_DEFAULT;
 };
 
-/**
-  \rst
-  Constructs a `~fmt::format_arg_store` object that contains references
-  to arguments and can be implicitly converted to `~fmt::format_args`.
-  If ``fmt`` is a compile-time string then `make_args_checked` checks
-  its validity at compile time.
-  \endrst
- */
-template <typename... Args, typename S, typename Char = char_t<S>>
-FMT_DEPRECATED FMT_INLINE auto make_args_checked(
-    const S& fmt, const remove_reference_t<Args>&... args)
-    -> format_arg_store<buffer_context<Char>, remove_reference_t<Args>...> {
-  static_assert(
-      detail::count<(
-              std::is_base_of<detail::view, remove_reference_t<Args>>::value &&
-              std::is_reference<Args>::value)...>() == 0,
-      "passing views as lvalues is disallowed");
-  detail::check_format_string<Args...>(fmt);
-  return {args...};
-}
-
 namespace detail_exported {
 #if FMT_USE_NONTYPE_TEMPLATE_PARAMETERS
 template <typename Char, size_t N> struct fixed_string {
@@ -3151,9 +3123,6 @@ struct join_view : detail::view {
       : begin(b), end(e), sep(s) {}
 };
 
-template <typename It, typename Sentinel, typename Char>
-using arg_join FMT_DEPRECATED_ALIAS = join_view<It, Sentinel, Char>;
-
 template <typename It, typename Sentinel, typename Char>
 struct formatter<join_view<It, Sentinel, Char>, Char> {
  private:
@@ -3424,14 +3393,6 @@ inline auto format(const Locale& loc, format_string<T...> fmt, T&&... args)
   return vformat(loc, string_view(fmt), fmt::make_format_args(args...));
 }
 
-template <typename... T, size_t SIZE, typename Allocator>
-FMT_DEPRECATED auto format_to(basic_memory_buffer<char, SIZE, Allocator>& buf,
-                              format_string<T...> fmt, T&&... args)
-    -> appender {
-  detail::vformat_to(buf, string_view(fmt), fmt::make_format_args(args...));
-  return appender(buf);
-}
-
 template <typename OutputIt, typename Locale,
           FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&&
                             detail::is_locale<Locale>::value)>
@@ -3454,10 +3415,6 @@ FMT_INLINE auto format_to(OutputIt out, const Locale& loc,
 FMT_MODULE_EXPORT_END
 FMT_END_NAMESPACE
 
-#ifdef FMT_DEPRECATED_INCLUDE_XCHAR
-#  include "xchar.h"
-#endif
-
 #ifdef FMT_HEADER_ONLY
 #  define FMT_FUNC inline
 #  include "format-inl.h"
diff --git a/include/fmt/printf.h b/include/fmt/printf.h
index 19d550f6..03a962b4 100644
--- a/include/fmt/printf.h
+++ b/include/fmt/printf.h
@@ -634,23 +634,6 @@ inline auto printf(const S& fmt, const T&... args) -> int {
       fmt::make_format_args<basic_printf_context_t<char_t<S>>>(args...));
 }
 
-template <typename S, typename Char = char_t<S>>
-FMT_DEPRECATED auto vfprintf(
-    std::basic_ostream<Char>& os, const S& fmt,
-    basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args)
-    -> int {
-  basic_memory_buffer<Char> buffer;
-  vprintf(buffer, to_string_view(fmt), args);
-  os.write(buffer.data(), static_cast<std::streamsize>(buffer.size()));
-  return static_cast<int>(buffer.size());
-}
-template <typename S, typename... T, typename Char = char_t<S>>
-FMT_DEPRECATED auto fprintf(std::basic_ostream<Char>& os, const S& fmt,
-                            const T&... args) -> int {
-  return vfprintf(os, to_string_view(fmt),
-                  fmt::make_format_args<basic_printf_context_t<Char>>(args...));
-}
-
 FMT_MODULE_EXPORT_END
 FMT_END_NAMESPACE
 
diff --git a/test/fuzzing/one-arg.cc b/test/fuzzing/one-arg.cc
index 90cec716..af9787f8 100644
--- a/test/fuzzing/one-arg.cc
+++ b/test/fuzzing/one-arg.cc
@@ -30,8 +30,8 @@ void invoke_fmt(const uint8_t* data, size_t size) {
 #if FMT_FUZZ_FORMAT_TO_STRING
     std::string message = fmt::format(format_str.get(), *value);
 #else
-    fmt::memory_buffer message;
-    fmt::format_to(message, format_str.get(), *value);
+    auto buf = fmt::memory_buffer();
+    fmt::format_to(std::back_inserter(buf), format_str.get(), *value);
 #endif
   } catch (std::exception&) {
   }
diff --git a/test/fuzzing/two-args.cc b/test/fuzzing/two-args.cc
index 979320c2..931c6465 100644
--- a/test/fuzzing/two-args.cc
+++ b/test/fuzzing/two-args.cc
@@ -27,8 +27,8 @@ void invoke_fmt(const uint8_t* data, size_t size) {
 #if FMT_FUZZ_FORMAT_TO_STRING
   std::string message = fmt::format(format_str, item1, item2);
 #else
-  fmt::memory_buffer message;
-  fmt::format_to(message, format_str, item1, item2);
+  auto buf = fmt::memory_buffer();
+  fmt::format_to(std::back_inserter(buf), format_str, item1, item2);
 #endif
 }