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diff --git a/external/cppcodec/base64_rfc4648.hpp b/external/cppcodec/base64_rfc4648.hpp
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+++ b/external/cppcodec/base64_rfc4648.hpp
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+/**
+ *  Copyright (C) 2015 Topology LP
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to
+ *  deal in the Software without restriction, including without limitation the
+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ *  sell copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#ifndef CPPCODEC_BASE64_RFC4648
+#define CPPCODEC_BASE64_RFC4648
+
+#include "detail/codec.hpp"
+#include "detail/base64.hpp"
+
+namespace cppcodec {
+
+namespace detail {
+
+static constexpr const char base64_rfc4648_alphabet[] = {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+    'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
+};
+
+class base64_rfc4648
+{
+public:
+    template <typename Codec> using codec_impl = stream_codec<Codec, base64_rfc4648>;
+
+    static CPPCODEC_ALWAYS_INLINE constexpr size_t alphabet_size() {
+        static_assert(sizeof(base64_rfc4648_alphabet) == 64, "base64 alphabet must have 64 values");
+        return sizeof(base64_rfc4648_alphabet);
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char symbol(alphabet_index_t idx)
+    {
+        return base64_rfc4648_alphabet[idx];
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char normalized_symbol(char c) { return c; }
+
+    static CPPCODEC_ALWAYS_INLINE constexpr bool generates_padding() { return true; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool requires_padding() { return true; }
+    static CPPCODEC_ALWAYS_INLINE constexpr char padding_symbol() { return '='; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_padding_symbol(char c) { return c == '='; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_eof_symbol(char c) { return c == '\0'; }
+
+    // RFC4648 does not specify any whitespace being allowed in base64 encodings.
+    static CPPCODEC_ALWAYS_INLINE constexpr bool should_ignore(char) { return false; }
+};
+
+} // namespace detail
+
+using base64_rfc4648 = detail::codec<detail::base64<detail::base64_rfc4648>>;
+
+} // namespace cppcodec
+
+#endif // CPPCODEC_BASE64_RFC4648
+\ No newline at end of file