diff --git a/Sources/XCLogParser/activityparser/ActivityParser.swift b/Sources/XCLogParser/activityparser/ActivityParser.swift
index b3927bc..73a53ea 100644
--- a/Sources/XCLogParser/activityparser/ActivityParser.swift
+++ b/Sources/XCLogParser/activityparser/ActivityParser.swift
@@ -110,6 +110,7 @@ public class ActivityParser {
                                      uniqueIdentifier: try parseAsString(token: iterator.next()),
                                      localizedResultString: try parseAsString(token: iterator.next()),
                                      xcbuildSignature: try parseAsString(token: iterator.next()),
+                                     attachments: try parseIDEActivityLogSectionAttachments(iterator: &iterator),
                                      unknown: isCommandLineLog ? Int(try parseAsInt(token: iterator.next())) : 0)
     }
 
@@ -133,6 +134,7 @@ public class ActivityParser {
                                          uniqueIdentifier: try parseAsString(token: iterator.next()),
                                          localizedResultString: try parseAsString(token: iterator.next()),
                                          xcbuildSignature: try parseAsString(token: iterator.next()),
+                                         attachments: try parseIDEActivityLogSectionAttachments(iterator: &iterator),
                                          unknown: isCommandLineLog ? Int(try parseAsInt(token: iterator.next())) : 0,
                                          testsPassedString: try parseAsString(token: iterator.next()),
                                          durationString: try parseAsString(token: iterator.next()),
@@ -163,6 +165,8 @@ public class ActivityParser {
                                                  localizedResultString: try parseAsString(token: iterator.next()),
                                                  xcbuildSignature: try parseAsString(token: iterator.next()),
                                                  // swiftlint:disable:next line_length
+                                                 attachments: try parseIDEActivityLogSectionAttachments(iterator: &iterator),
+                                                 // swiftlint:disable:next line_length
                                                  unknown: isCommandLineLog ? Int(try parseAsInt(token: iterator.next())) : 0,
                                                  logConsoleItems: try parseIDEConsoleItems(iterator: &iterator)
                                                  )
@@ -361,6 +365,25 @@ public class ActivityParser {
         throw XCLogParserError.parseError("Unexpected className found parsing IDEActivityLogMessage \(className)")
     }
 
+    private func parseLogSectionAttachment(iterator: inout IndexingIterator<[Token]>)
+        throws -> IDEActivityLogSectionAttachment {
+            let classRefToken = try getClassRefToken(iterator: &iterator)
+            guard case Token.classNameRef(let className) = classRefToken else {
+                throw XCLogParserError.parseError("Unexpected token found parsing " +
+                                                  "IDEActivityLogSectionAttachment \(classRefToken)")
+            }
+
+            if className == "IDEFoundation.\(String(describing: IDEActivityLogSectionAttachment.self))" {
+                let jsonType = IDEActivityLogSectionAttachment.BuildOperationTaskMetrics.self
+                return try IDEActivityLogSectionAttachment(identifier: try parseAsString(token: iterator.next()),
+                                                           majorVersion: try parseAsInt(token: iterator.next()),
+                                                           minorVersion: try parseAsInt(token: iterator.next()),
+                                                           metrics: try parseAsJson(token: iterator.next(),
+                                                                                    type: jsonType))
+            }
+            throw XCLogParserError.parseError("Unexpected className found parsing IDEConsoleItem \(className)")
+    }
+
     private func parseLogSection(iterator: inout IndexingIterator<[Token]>)
         throws -> IDEActivityLogSection {
         var classRefToken = try getClassRefToken(iterator: &iterator)
@@ -433,6 +456,27 @@ public class ActivityParser {
             }
     }
 
+    private func parseIDEActivityLogSectionAttachments(iterator: inout IndexingIterator<[Token]>)
+        throws -> [IDEActivityLogSectionAttachment] {
+            guard let listToken = iterator.next() else {
+                throw XCLogParserError.parseError("Unexpected EOF parsing array of IDEActivityLogSectionAttachment")
+            }
+            switch listToken {
+            case .null:
+                return []
+            case .list(let count):
+                var sections = [IDEActivityLogSectionAttachment]()
+                for _ in 0..<count {
+                    let section = try parseLogSectionAttachment(iterator: &iterator)
+                    sections.append(section)
+                }
+                return sections
+            default:
+                throw XCLogParserError.parseError("Unexpected token parsing array of " +
+                                                  "IDEActivityLogSectionAttachment: \(listToken)")
+            }
+    }
+
     private func parseIDEConsoleItem(iterator: inout IndexingIterator<[Token]>)
         throws -> IDEConsoleItem? {
             let classRefToken = try getClassRefToken(iterator: &iterator)
@@ -555,6 +599,23 @@ public class ActivityParser {
         }
     }
 
+    private func parseAsJson<T: Decodable>(token: Token?, type: T.Type) throws -> T? {
+        guard let token = token else {
+            throw XCLogParserError.parseError("Unexpected EOF parsing JSON String")
+        }
+        switch token {
+        case .json(let string):
+            guard let data = string.data(using: .utf8) else {
+                throw XCLogParserError.parseError("Unexpected JSON string \(string)")
+            }
+            return try JSONDecoder().decode(type, from: data)
+        case .null:
+            return nil
+        default:
+            throw XCLogParserError.parseError("Unexpected token parsing JSON String: \(token)")
+        }
+    }
+
     private func parseAsInt(token: Token?) throws -> UInt64 {
         guard let token = token else {
             throw XCLogParserError.parseError("Unexpected EOF parsing Int")
diff --git a/Sources/XCLogParser/activityparser/IDEActivityModel.swift b/Sources/XCLogParser/activityparser/IDEActivityModel.swift
index bbd1069..adeb83f 100644
--- a/Sources/XCLogParser/activityparser/IDEActivityModel.swift
+++ b/Sources/XCLogParser/activityparser/IDEActivityModel.swift
@@ -49,6 +49,7 @@ public class IDEActivityLogSection: Encodable {
     public let uniqueIdentifier: String
     public let localizedResultString: String
     public let xcbuildSignature: String
+    public let attachments: [IDEActivityLogSectionAttachment]
     public let unknown: Int
 
     public init(sectionType: Int8,
@@ -69,6 +70,7 @@ public class IDEActivityLogSection: Encodable {
                 uniqueIdentifier: String,
                 localizedResultString: String,
                 xcbuildSignature: String,
+                attachments: [IDEActivityLogSectionAttachment],
                 unknown: Int) {
         self.sectionType = sectionType
         self.domainType = domainType
@@ -88,6 +90,7 @@ public class IDEActivityLogSection: Encodable {
         self.uniqueIdentifier = uniqueIdentifier
         self.localizedResultString = localizedResultString
         self.xcbuildSignature = xcbuildSignature
+        self.attachments = attachments
         self.unknown = unknown
     }
 
@@ -119,6 +122,7 @@ public class IDEActivityLogUnitTestSection: IDEActivityLogSection {
                 uniqueIdentifier: String,
                 localizedResultString: String,
                 xcbuildSignature: String,
+                attachments: [IDEActivityLogSectionAttachment],
                 unknown: Int,
                 testsPassedString: String,
                 durationString: String,
@@ -151,6 +155,7 @@ public class IDEActivityLogUnitTestSection: IDEActivityLogSection {
                    uniqueIdentifier: uniqueIdentifier,
                    localizedResultString: localizedResultString,
                    xcbuildSignature: xcbuildSignature,
+                   attachments: attachments,
                    unknown: unknown)
     }
 
@@ -421,6 +426,7 @@ public class DBGConsoleLog: IDEActivityLogSection {
                 uniqueIdentifier: String,
                 localizedResultString: String,
                 xcbuildSignature: String,
+                attachments: [IDEActivityLogSectionAttachment],
                 unknown: Int,
                 logConsoleItems: [IDEConsoleItem]) {
         self.logConsoleItems = logConsoleItems
@@ -442,6 +448,7 @@ public class DBGConsoleLog: IDEActivityLogSection {
                    uniqueIdentifier: uniqueIdentifier,
                    localizedResultString: localizedResultString,
                    xcbuildSignature: xcbuildSignature,
+                   attachments: attachments,
                    unknown: unknown)
     }
 
@@ -635,3 +642,32 @@ public class DVTMemberDocumentLocation: DVTDocumentLocation, Equatable {
     }
 
 }
+
+// MARK: Added in Xcode 15.3
+
+public class IDEActivityLogSectionAttachment: Encodable {
+    public struct BuildOperationTaskMetrics: Codable {
+        public let utime: UInt64
+        public let stime: UInt64
+        public let maxRSS: UInt64
+        public let wcStartTime: UInt64
+        public let wcDuration: UInt64
+    }
+
+    public let identifier: String
+    public let majorVersion: UInt64
+    public let minorVersion: UInt64
+    public let metrics: BuildOperationTaskMetrics?
+
+    public init(
+        identifier: String,
+        majorVersion: UInt64,
+        minorVersion: UInt64,
+        metrics: BuildOperationTaskMetrics?
+    ) throws {
+        self.identifier = identifier
+        self.majorVersion = majorVersion
+        self.minorVersion = minorVersion
+        self.metrics = metrics
+    }
+}
diff --git a/Sources/XCLogParser/lexer/Lexer.swift b/Sources/XCLogParser/lexer/Lexer.swift
index fb55553..03ad44b 100644
--- a/Sources/XCLogParser/lexer/Lexer.swift
+++ b/Sources/XCLogParser/lexer/Lexer.swift
@@ -163,6 +163,11 @@ public final class Lexer {
             return .null
         case .list:
             return handleListTokenTypeCase(payload: payload)
+        case .json:
+            return handleJSONTokenTypeCase(scanner: scanner,
+                                           payload: payload,
+                                           redacted: redacted,
+                                           withoutBuildSpecificInformation: withoutBuildSpecificInformation)
         }
     }
 
@@ -213,6 +218,20 @@ public final class Lexer {
         return .string(content)
     }
 
+    private func handleJSONTokenTypeCase(scanner: Scanner,
+                                         payload: String,
+                                         redacted: Bool,
+                                         withoutBuildSpecificInformation: Bool) -> Token? {
+        guard let content = scanString(length: payload,
+                                       scanner: scanner,
+                                       redacted: redacted,
+                                       withoutBuildSpecificInformation: withoutBuildSpecificInformation) else {
+                                        print("error parsing string")
+                                        return nil
+        }
+        return .json(content)
+    }
+
     private func handleDoubleTokenTypeCase(payload: String) -> Token? {
         guard let double = hexToInt(payload) else {
             print("error parsing double")
diff --git a/Sources/XCLogParser/lexer/LexerModel.swift b/Sources/XCLogParser/lexer/LexerModel.swift
index e13a875..4c66d96 100644
--- a/Sources/XCLogParser/lexer/LexerModel.swift
+++ b/Sources/XCLogParser/lexer/LexerModel.swift
@@ -27,6 +27,7 @@ public enum TokenType: String, CaseIterable {
     case double = "^"
     case null = "-"
     case list = "("
+    case json = "*"
 
     static func all() -> String {
         return TokenType.allCases.reduce(String()) {
@@ -43,6 +44,7 @@ public enum Token: CustomDebugStringConvertible, Equatable {
     case double(Double)
     case null
     case list(Int)
+    case json(String)
 }
 
 extension Token {
@@ -62,6 +64,8 @@ extension Token {
             return "[type: nil]"
         case .list(let count):
             return "[type: list, count: \(count)]"
+        case .json(let json):
+            return "[type: json, value: \(json)]"
         }
     }
 }
diff --git a/Sources/XCLogParser/parser/IDEActivityLogSection+Builders.swift b/Sources/XCLogParser/parser/IDEActivityLogSection+Builders.swift
index 309e356..fd04da3 100644
--- a/Sources/XCLogParser/parser/IDEActivityLogSection+Builders.swift
+++ b/Sources/XCLogParser/parser/IDEActivityLogSection+Builders.swift
@@ -40,6 +40,7 @@ extension IDEActivityLogSection {
                                      uniqueIdentifier: self.uniqueIdentifier,
                                      localizedResultString: self.localizedResultString,
                                      xcbuildSignature: self.xcbuildSignature,
+                                     attachments: self.attachments,
                                      unknown: self.unknown)
     }
 
diff --git a/Sources/XCLogParser/parser/IDEActivityLogSection+Parsing.swift b/Sources/XCLogParser/parser/IDEActivityLogSection+Parsing.swift
index 75ec0bf..b16a7b8 100644
--- a/Sources/XCLogParser/parser/IDEActivityLogSection+Parsing.swift
+++ b/Sources/XCLogParser/parser/IDEActivityLogSection+Parsing.swift
@@ -156,6 +156,7 @@ extension IDEActivityLogSection {
             uniqueIdentifier: "",
             localizedResultString: "",
             xcbuildSignature: "",
+            attachments: section.attachments,
             unknown: 0)
     }
 
diff --git a/Tests/XCLogParserTests/ActivityParserTests.swift b/Tests/XCLogParserTests/ActivityParserTests.swift
index 1076d13..8165c9e 100644
--- a/Tests/XCLogParserTests/ActivityParserTests.swift
+++ b/Tests/XCLogParserTests/ActivityParserTests.swift
@@ -97,6 +97,12 @@ class ActivityParserTests: XCTestCase {
                          Token.string("501796C4-6BE4-4F80-9F9D-3269617ECC17"),
                          Token.string("localizedResultString"),
                          Token.string("xcbuildSignature"),
+                         Token.list(1),
+                         Token.classNameRef("IDEFoundation.IDEActivityLogSectionAttachment"),
+                         Token.string("com.apple.dt.ActivityLogSectionAttachment.TaskMetrics"),
+                         Token.int(1),
+                         Token.int(0),
+                         Token.json("{\"wcStartTime\":1,\"maxRSS\":1,\"utime\":1,\"wcDuration\":1,\"stime\":1}"),
                          Token.int(0)
         ]
         return startTokens + logMessageTokens + endTokens
@@ -129,7 +135,13 @@ class ActivityParserTests: XCTestCase {
                            Token.string("79D9C1DE-F736-4743-A7C6-B08ED42A1DFE"),
                            Token.null,
                            Token.null,
-                           Token.list(1)
+                           Token.list(1),
+                           Token.classNameRef("IDEFoundation.IDEActivityLogSectionAttachment"),
+                           Token.string("com.apple.dt.ActivityLogSectionAttachment.TaskMetrics"),
+                           Token.int(1),
+                           Token.int(0),
+                           Token.json("{\"wcStartTime\":1,\"maxRSS\":1,\"utime\":1,\"wcDuration\":1,\"stime\":1}"),
+                           Token.list(1),
         ]
         return startTokens + IDEConsoleItemTokens
     }()
diff --git a/Tests/XCLogParserTests/ClangCompilerParserTests.swift b/Tests/XCLogParserTests/ClangCompilerParserTests.swift
index a843d3b..1a87e02 100644
--- a/Tests/XCLogParserTests/ClangCompilerParserTests.swift
+++ b/Tests/XCLogParserTests/ClangCompilerParserTests.swift
@@ -95,6 +95,7 @@ class ClangCompilerParserTests: XCTestCase {
                                      uniqueIdentifier: "",
                                      localizedResultString: "",
                                      xcbuildSignature: "",
+                                     attachments: [],
                                      unknown: 0)
     }
 }
diff --git a/Tests/XCLogParserTests/LogManifestTests.swift b/Tests/XCLogParserTests/LogManifestTests.swift
index 3e2f164..bbccf04 100644
--- a/Tests/XCLogParserTests/LogManifestTests.swift
+++ b/Tests/XCLogParserTests/LogManifestTests.swift
@@ -28,7 +28,7 @@ class LogManifestTests: XCTestCase {
 <plist version="1.0">
 <dict>
 <key>logFormatVersion</key>
-<integer>10</integer>
+<integer>11</integer>
 <key>logs</key>
 <dict>
 <key>E8557234-04E4-40E7-A6D6-920AC64BCF21</key>
diff --git a/Tests/XCLogParserTests/ParserTests.swift b/Tests/XCLogParserTests/ParserTests.swift
index 3af5682..a0e978a 100644
--- a/Tests/XCLogParserTests/ParserTests.swift
+++ b/Tests/XCLogParserTests/ParserTests.swift
@@ -64,6 +64,7 @@ class ParserTests: XCTestCase {
                                                     uniqueIdentifier: uniqueIdentifier,
                                                     localizedResultString: "",
                                                     xcbuildSignature: "",
+                                                    attachments: [],
                                                     unknown: 0)
         let fakeActivityLog = IDEActivityLog(version: 10, mainSection: fakeMainSection)
         let buildStep = try parser.parse(activityLog: fakeActivityLog)
@@ -260,6 +261,7 @@ note: use 'updatedDoSomething' instead\r doSomething()\r        ^~~~~~~~~~~\r
                                                 uniqueIdentifier: "ABC",
                                                 localizedResultString: "",
                                                 xcbuildSignature: "",
+                                                attachments: [],
                                                 unknown: 0)
 
         let parsedTarget = fakeSection.getTargetFromCommand()
@@ -310,6 +312,7 @@ note: use 'updatedDoSomething' instead\r doSomething()\r        ^~~~~~~~~~~\r
                                                  uniqueIdentifier: "uniqueIdentifier",
                                                  localizedResultString: "",
                                                  xcbuildSignature: "",
+                                                 attachments: [],
                                                  unknown: 0)
         return IDEActivityLog(version: 10, mainSection: fakeMainStep)
     }
@@ -555,6 +558,7 @@ CompileSwift normal x86_64 (in target 'Alamofire' from project 'Pods')
                                      uniqueIdentifier: "uniqueIdentifier",
                                      localizedResultString: "",
                                      xcbuildSignature: "",
+                                     attachments: [],
                                      unknown: 0)
     }()
 }
diff --git a/Tests/XCLogParserTests/SwiftCompilerParserTests.swift b/Tests/XCLogParserTests/SwiftCompilerParserTests.swift
index 0400ef4..686a117 100644
--- a/Tests/XCLogParserTests/SwiftCompilerParserTests.swift
+++ b/Tests/XCLogParserTests/SwiftCompilerParserTests.swift
@@ -127,6 +127,7 @@ class SwiftCompilerParserTests: XCTestCase {
                                      uniqueIdentifier: "",
                                      localizedResultString: "",
                                      xcbuildSignature: "",
+                                     attachments: [],
                                      unknown: 0)
     }
 
diff --git a/docs/Xcactivitylog Format.md b/docs/Xcactivitylog Format.md
index b566b42..dc6c31c 100644
--- a/docs/Xcactivitylog Format.md	
+++ b/docs/Xcactivitylog Format.md	
@@ -15,6 +15,7 @@ A `SLF` document starts with the header `SLF0`. After the header, the document h
 - Class names
 - Class instances
 - Null
+- JSON
 
 A value encoded is formed by 3 parts:
 
@@ -81,6 +82,14 @@ In this case, there are three encoded values:
 
 The elements of an `Array` are `Class instances`
 
+### JSON
+
+- Character type delimiter: `*`
+- Example: `"{\"wcStartTime\":732791618924407,\"maxRSS\":0,\"utime\":798,\"wcDuration\":852,\"stime\":798}"`
+- Left hand side value: An `Integer` with the number of characters that are part of the `JSON` string.
+
+The JSON is of the type `IDEFoundation.IDEActivityLogSectionAttachment`
+
 ### Class name
 
 - Character type delimiter: `%`
@@ -142,6 +151,7 @@ Inside the logs you can find these classes:
 - `DVTTextDocumentLocation`
 - `IDEActivityLogCommandInvocationSection`
 - `IDEActivityLogMajorGroupSection`
+- `IDEFoundation.IDEActivityLogSectionAttachment`
 
 If you search for them, you will find that they belong to the IDEFoundation.framework. A private framework part of Xcode. You can class dump it to get the headers of those classes. Once you have the headers, you will have the name and type of the properties that belong to the class. Now, you can match them to the tokens you got from the log. Some of them are in the same order than in the headers, but for others it will be about trial and error.