diff --git a/modules/ROOT/pages/bolt-compatibility.adoc b/modules/ROOT/pages/bolt-compatibility.adoc
index 5037f07..ce19852 100644
--- a/modules/ROOT/pages/bolt-compatibility.adoc
+++ b/modules/ROOT/pages/bolt-compatibility.adoc
@@ -8,12 +8,19 @@ As soon as a decision is made, it will be documented here.]]
 
 == Bolt 6.x
 
-[cols="^,^",options="header"]
+[cols="^,^,^",options="header"]
 |===
 | Neo4j version
 | Bolt `6.0`
+| Bolt `6.1`
 
-| `2025.10` - current{fn-version-plus}
+
+| `2025.10` - `2026.08`
+| `x`
+|
+
+| `2026.09` - current{fn-version-plus}
+| `x`
 | `x`
 
 |===
diff --git a/modules/ROOT/pages/bolt/message.adoc b/modules/ROOT/pages/bolt/message.adoc
index 1edc295..81e524d 100644
--- a/modules/ROOT/pages/bolt/message.adoc
+++ b/modules/ROOT/pages/bolt/message.adoc
@@ -2171,6 +2171,12 @@ RECORD [{"point": [1, 2]}, "example_data", 123]
 The sections below list the changes of messages compared to the previous version.
 Please also check for changes in xref:./structure-semantics.adoc#structure-summary[Structure Semantics].
 
+[[messages-summary-61]]
+=== Version 6.1
+
+** Update to PackStream `1.1` (introducing `UUID` type)
+
+
 [[messages-summary-6]]
 === Version 6.0
 
diff --git a/modules/ROOT/pages/packstream/index.adoc b/modules/ROOT/pages/packstream/index.adoc
index c11f9f1..630076f 100644
--- a/modules/ROOT/pages/packstream/index.adoc
+++ b/modules/ROOT/pages/packstream/index.adoc
@@ -4,7 +4,24 @@
 
 PackStream is a binary presentation format for the exchange of richly-typed data. It provides a syntax layer for the Bolt messaging protocol.
 
-== Version 1
+== Versioning
+
+PackStream is versioned independently of the bolt protocol.
+Only one version of PackStream is supported in each bolt protocol version.
+
+
+|===
+|Bolt Protocol Version |PackStream Version
+
+|< 6.0
+|1.0
+
+|>= 6.1
+| 1.1
+
+|===
+
+== Definition
 
 PackStream is a general purpose data serialisation format, originally inspired by (but incompatible with) link:https://msgpack.org/[MessagePack].
 
@@ -38,6 +55,9 @@ The core data types are described in the table below.
 | <<data-type-string, `String`>>
 | unicode text, *UTF-8*
 
+| <<data-type-uuid, `UUID`>>
+| 128-bit identifier
+
 | <<data-type-list, `List`>>
 | ordered collection of values
 
@@ -493,6 +513,20 @@ N.B. While the unsigned 32-bit integer following `D3` could hold a bigger number
 | `D0 12 47 72 C3 B6 C3 9F 65 6E 6D 61 C3 9F 73 74 C3 A4 62 65`
 |===
 
+[[data-type-uuid]]
+=== `UUID`
+label:new[PackStream 1.1]
+
+A UUID (Universally Unique Identifier, https://www.rfc-editor.org/rfc/rfc9562.html[RFC 9562]) is a 128-bit value used to uniquely identify information.
+UUIDs are commonly represented as a hyphenated hexadecimal string such as `550e8400-e29b-41d4-a716-446655440000`, which encodes the 16 bytes in big-endian order across five groups separated by hyphens.
+
+A UUID type is represented with marker byte `E0` followed by the 16 bytes that represent the UUID as defined in RFC 9562.
+
+For example the UUID `550e8400-e29b-41d4-a716-446655440000` is represented as follows:
+
+```
+E0 55 0E 84 00 E2 9B 41 D4 A7 16 44 66 55 44 00 00
+```
 [[data-type-list]]
 === `List`
 
@@ -876,3 +910,16 @@ The *tag byte* is used to identify the type or class of the structure and may ho
 
 PackStream itself does not define semantics for different structures.
 Instead, refer to the xref:bolt/structure-semantics.adoc[] for the Bolt version in question.
+
+[[changelog]]
+== Changelog
+
+[[packsteam-summary-1-1]]
+=== Version 1.1
+
+** Introduction of `UUID` type.
+
+[[packstream-summary-1]]
+=== Version 1.0
+
+** Initial version consisting of `NULL`, `Boolean`, `Integer`, `Float`, `Bytes`, `String`, `List` `Dictionary` and `Structure` types.