diff --git a/docs/mkdocs/docs/features/binary_formats/bjdata.md b/docs/mkdocs/docs/features/binary_formats/bjdata.md
index c458af6b3..769da056b 100644
--- a/docs/mkdocs/docs/features/binary_formats/bjdata.md
+++ b/docs/mkdocs/docs/features/binary_formats/bjdata.md
@@ -88,7 +88,6 @@ The library uses the following mapping from JSON values types to BJData types ac
 | number_integer  | 65536..2147483647                         | int32       | `l`                                                                     |
 | number_integer  | 2147483648..4294967295                    | uint32      | `m`                                                                     |
 | number_integer  | 4294967296..9223372036854775807           | int64       | `L`                                                                     |
-| number_integer  | 9223372036854775808..18446744073709551615 | uint64      | `M`                                                                     |
 | number_unsigned | 0..127                                    | int8        | `i`                                                                     |
 | number_unsigned | 128..255                                  | uint8       | `U`                                                                     |
 | number_unsigned | 256..32767                                | int16       | `I`                                                                     |
diff --git a/docs/mkdocs/docs/features/binary_formats/messagepack.md b/docs/mkdocs/docs/features/binary_formats/messagepack.md
index 17c05625d..00d6ee39e 100644
--- a/docs/mkdocs/docs/features/binary_formats/messagepack.md
+++ b/docs/mkdocs/docs/features/binary_formats/messagepack.md
@@ -61,7 +61,7 @@ specification:
 | number_integer  | 128..255                                 | uint 8           | 0xCC       |
 | number_integer  | 256..65535                               | uint 16          | 0xCD       |
 | number_integer  | 65536..4294967295                        | uint 32          | 0xCE       |
-| number_integer  | 4294967296..18446744073709551615         | uint 64          | 0xCF       |
+| number_integer  | 4294967296..9223372036854775807          | uint 64          | 0xCF       |
 | number_unsigned | 0..127                                   | positive fixint  | 0x00..0x7F |
 | number_unsigned | 128..255                                 | uint 8           | 0xCC       |
 | number_unsigned | 256..65535                               | uint 16          | 0xCD       |