diff --git a/include/fmt/format.h b/include/fmt/format.h
index 17be15b4..9d380000 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -50,6 +50,7 @@
 #endif
 #if FMT_USE_TEXT
 #  include <boost/text/grapheme_break.hpp>
+#  include <boost/text/transcode_iterator.hpp>
 #endif
 
 #ifdef __clang__
@@ -922,7 +923,11 @@ inline size_t compute_width(basic_string_view<Char> s) {
 inline size_t compute_width(string_view s) {
 #if FMT_USE_TEXT
   basic_memory_buffer<uint32_t> code_points;
-  for (auto cp : boost::text::make_to_utf32_range(s)) code_points.push_back(cp);
+  const char* s_end = s.data() + s.size();
+  boost::text::utf_8_to_32_iterator<const char*> begin(s.data(), s.data(),
+                                                       s_end),
+      end(s.data(), s_end, s_end);
+  for (auto it = begin; it != end; ++it) code_points.push_back(*it);
   size_t width = 0;
   for (auto it = code_points.begin(), end = code_points.end(); it != end;
        it = boost::text::next_grapheme_break(it, end)) {
diff --git a/src/text/boost/text/detail/lzw.hpp b/src/text/boost/text/detail/lzw.hpp
index 2be67846..f82ad8da 100644
--- a/src/text/boost/text/detail/lzw.hpp
+++ b/src/text/boost/text/detail/lzw.hpp
@@ -1,6 +1,7 @@
 #ifndef BOOST_TEXT_DETAIL_LZW_HPP
 #define BOOST_TEXT_DETAIL_LZW_HPP
 
+#include <boost/assert.hpp>
 #include <boost/container/small_vector.hpp>
 
 #include <vector>
diff --git a/src/text/boost/text/grapheme_break.hpp b/src/text/boost/text/grapheme_break.hpp
index 22c93684..f1639f9c 100644
--- a/src/text/boost/text/grapheme_break.hpp
+++ b/src/text/boost/text/grapheme_break.hpp
@@ -2,7 +2,7 @@
 #define BOOST_TEXT_GRAPHEME_BREAK_HPP
 
 #include <boost/text/algorithm.hpp>
-#include <boost/text/utility.hpp>
+#include <boost/text/config.hpp>
 
 #include <array>
 #include <unordered_map>
@@ -157,8 +157,7 @@ constexpr std::array<std::array<bool, 15>, 15> grapheme_breaks = {{
     }
 
     template<typename CPIter, typename Sentinel>
-    auto next_grapheme_break(CPIter first, Sentinel last) noexcept
-        -> detail::cp_iter_ret_t<CPIter, CPIter>
+    CPIter next_grapheme_break(CPIter first, Sentinel last) noexcept
     {
         if (first == last)
             return first;
diff --git a/src/text/boost/text/utility.hpp b/src/text/boost/text/utility.hpp
deleted file mode 100644
index 56e7c420..00000000
--- a/src/text/boost/text/utility.hpp
+++ /dev/null
@@ -1,248 +0,0 @@
-#ifndef BOOST_TEXT_UTILITY_HPP
-#define BOOST_TEXT_UTILITY_HPP
-
-#include <boost/text/transcode_iterator.hpp>
-#include <boost/text/detail/algorithm.hpp>
-#include <boost/text/detail/sentinel_tag.hpp>
-
-
-namespace boost { namespace text {
-
-    /** A range that adapts a sequence of `char const *` to a sequence of code
-        points. */
-    struct utf32_range
-    {
-        using iterator = utf_8_to_32_iterator<char const *>;
-
-        utf32_range() :
-            first_(nullptr, nullptr, nullptr),
-            last_(nullptr, nullptr, nullptr)
-        {}
-        utf32_range(char const * f, char const * l) :
-            first_(f, f, l),
-            last_(f, l, l)
-        {}
-        utf32_range(iterator f, iterator l) : first_(f), last_(l) {}
-        template<typename CharRange>
-        utf32_range(CharRange const & r) :
-            first_(std::begin(r), std::begin(r), std::end(r)),
-            last_(std::begin(r), std::end(r), std::end(r))
-        {}
-
-        bool empty() const noexcept { return first_ == last_; }
-
-        iterator begin() const noexcept { return first_; }
-        iterator end() const noexcept { return last_; }
-
-        friend bool operator==(utf32_range lhs, utf32_range rhs)
-        {
-            return lhs.first_ == rhs.first_ && lhs.last_ == rhs.last_;
-        }
-        friend bool operator!=(utf32_range lhs, utf32_range rhs)
-        {
-            return !(lhs == rhs);
-        }
-
-    private:
-        iterator first_;
-        iterator last_;
-    };
-
-    /** A range of code points. */
-    template<typename CPIter, typename Sentinel = CPIter>
-    struct cp_range
-    {
-        using iterator = CPIter;
-        using sentinel = Sentinel;
-
-        static_assert(
-            detail::is_cp_iter<CPIter>::value,
-            "CPIter must be a code point iterator");
-
-        cp_range() {}
-        cp_range(iterator first, sentinel last) : first_(first), last_(last) {}
-
-        bool empty() const noexcept { return first_ == last_; }
-
-        iterator begin() const { return first_; }
-        sentinel end() const { return last_; }
-
-        friend bool operator==(cp_range lhs, cp_range rhs)
-        {
-            return lhs.first_ == rhs.first_ && lhs.last_ == rhs.last_;
-        }
-        friend bool operator!=(cp_range lhs, cp_range rhs)
-        {
-            return !(lhs == rhs);
-        }
-
-    private:
-        iterator first_;
-        sentinel last_;
-    };
-
-    /** A generic range. */
-    template<typename Iter, typename Sentinel = Iter>
-    struct range
-    {
-        using iterator = Iter;
-        using sentinel = Sentinel;
-
-        range() {}
-        range(iterator first, sentinel last) : first_(first), last_(last) {}
-
-        bool empty() const noexcept { return first_ == last_; }
-
-        iterator begin() const { return first_; }
-        sentinel end() const { return last_; }
-
-        friend bool operator==(range lhs, range rhs)
-        {
-            return lhs.first_ == rhs.first_ && lhs.last_ == rhs.last_;
-        }
-        friend bool operator!=(range lhs, range rhs) { return !(lhs == rhs); }
-
-    private:
-        iterator first_;
-        sentinel last_;
-    };
-
-    namespace detail {
-        template<typename T>
-        using remove_cv_ref_t = typename std::remove_cv<
-            typename std::remove_reference<T>::type>::type;
-
-        template<typename Range>
-        using iterator_t =
-            remove_cv_ref_t<decltype(std::declval<Range>().begin())>;
-
-        template<typename Range>
-        using sentinel_t =
-            remove_cv_ref_t<decltype(std::declval<Range>().end())>;
-
-        template<
-            template<class, class, class> class IterTemplate,
-            typename Iter,
-            typename Sentinel>
-        struct make_range_impl_t
-        {
-            using iter_t =
-                IterTemplate<Iter, Sentinel, use_replacement_character>;
-            static range<iter_t, Sentinel>
-            call(Iter first, Sentinel last) noexcept
-            {
-                return {iter_t{first, first, last}, last};
-            }
-        };
-
-        template<
-            template<class, class, class> class IterTemplate,
-            typename Iter>
-        struct make_range_impl_t<IterTemplate, Iter, Iter>
-        {
-            using iter_t = IterTemplate<Iter, Iter, use_replacement_character>;
-            static range<iter_t, iter_t> call(Iter first, Iter last) noexcept
-            {
-                return {iter_t{first, first, last}, iter_t{first, last, last}};
-            }
-        };
-
-        template<
-            template<class, class, class> class IterTemplate,
-            typename Range>
-        struct make_range_t
-        {
-            using impl_t = make_range_impl_t<
-                IterTemplate,
-                iterator_t<Range const>,
-                sentinel_t<Range const>>;
-            static auto call(Range const & r) noexcept
-                -> decltype(impl_t::call(std::begin(r), std::end(r)))
-            {
-                return impl_t::call(std::begin(r), std::end(r));
-            }
-        };
-    }
-
-#ifdef BOOST_TEXT_DOXYGEN
-
-    /** Returns a range of code points transcoded from the given range of
-        UTF-8 code units.
-
-        This function only participates in overload resolution if `CharRange`
-        models the CharRange concept. */
-    template<typename CharRange>
-    detail::unspecified make_to_utf32_range(CharRange const & r) noexcept;
-
-    /** Returns a range of UTF-8 code units transcoded from the given range of
-        code points.
-
-        This function only participates in overload resolution if `CPRange`
-        models the CPRange concept. */
-    template<typename CPRange>
-    detail::unspecified make_from_utf32_range(CPRange const & r) noexcept;
-
-    /** Returns a range of UTF-16 code units transcoded from the given range
-        of UTF-8 code units.
-
-        This function only participates in overload resolution if `CharRange`
-        models the CharRange concept. */
-    template<typename CharRange>
-    detail::unspecified make_to_utf16_range(CharRange const & r) noexcept;
-
-    /** Returns a range of UTF-8 code units transcoded from the given range of
-        UTF-16 code units.
-
-        This function only participates in overload resolution if
-        `Char16Range` is a range of 16-bit integral values, each of which is
-        convertible to `uint16_t`. */
-    template<typename Char16Range>
-    detail::unspecified make_from_utf16_range(Char16Range const & r) noexcept;
-
-#else
-
-    template<typename CharRange>
-    auto make_to_utf32_range(CharRange const & r) noexcept
-        -> detail::rng_alg_ret_t<
-            decltype(
-                detail::make_range_t<utf_8_to_32_iterator, CharRange>::call(r)),
-            CharRange>
-    {
-        return detail::make_range_t<utf_8_to_32_iterator, CharRange>::call(r);
-    }
-
-    template<typename CPRange>
-    auto make_from_utf32_range(CPRange const & r) noexcept
-        -> detail::cp_rng_alg_ret_t<
-            decltype(
-                detail::make_range_t<utf_32_to_8_iterator, CPRange>::call(r)),
-            CPRange>
-    {
-        return detail::make_range_t<utf_32_to_8_iterator, CPRange>::call(r);
-    }
-
-    template<typename CharRange>
-    auto make_to_utf16_range(CharRange const & r) noexcept
-        -> detail::rng_alg_ret_t<
-            decltype(
-                detail::make_range_t<utf_8_to_16_iterator, CharRange>::call(r)),
-            CharRange>
-    {
-        return detail::make_range_t<utf_8_to_16_iterator, CharRange>::call(r);
-    }
-
-    template<typename Char16Range>
-    auto make_from_utf16_range(Char16Range const & r) noexcept
-        -> detail::rng16_alg_ret_t<
-            decltype(detail::make_range_t<utf_16_to_8_iterator, Char16Range>::
-                         call(r)),
-            Char16Range>
-    {
-        return detail::make_range_t<utf_16_to_8_iterator, Char16Range>::call(r);
-    }
-
-#endif
-
-}}
-
-#endif