diff --git a/.gitignore b/.gitignore
index 0023a53..4b2e945 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ DerivedData/
 .swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
+*.xcuserstate
diff --git a/Package.resolved b/Package.resolved
index 33bad59..4787cb3 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -23,8 +23,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/tomasf/SwiftSCAD.git",
       "state" : {
-        "revision" : "d874d042c45046f1f87b4e27bc27ddd292fa874a",
-        "version" : "0.7.1"
+        "revision" : "06d0fa1ee58b340ce288ded167e91dda02e11119",
+        "version" : "0.8.1"
       }
     }
   ],
diff --git a/Package.swift b/Package.swift
index 60bd345..416f6dd 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,22 +1,21 @@
-// swift-tools-version: 5.9
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+// swift-tools-version: 6.0
 
 import PackageDescription
 
 let package = Package(
     name: "RichText",
-    platforms: [.macOS(.v14)],
+    platforms: [.macOS(.v13)],
     products: [
         .library(name: "RichText", targets: ["RichText"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/tomasf/SwiftSCAD.git", from: "0.7.1"),
-        .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
+        .package(url: "https://github.com/tomasf/SwiftSCAD.git", .upToNextMinor(from: "0.8.1")),
+        .package(url: "https://github.com/apple/swift-log.git", from: "1.6.1"),
     ],
     targets: [
         .target(name: "RichText", dependencies: [
-            "SwiftSCAD",
-            .product(name: "Logging", package: "swift-log")
-        ]),
+            .product(name: "SwiftSCAD", package: "SwiftSCAD"),
+            .product(name: "Logging", package: "swift-log"),
+        ])
     ]
 )
diff --git a/README.md b/README.md
index 44d0c61..1b7df27 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,16 @@
 RichText is a macOS-specific companion library for SwiftSCAD that adds TextKit-based text generation. This enables proper Unicode support, richer typography, attribute ranges, multi-line text, constrained layout, bounding boxes, glyph-level manipulation and more.
 
 This package also contains a `Geometry2D` extension for `CGPath` that can be used for other Core Graphics-related purposes.
+
+<pre>
+let package = Package(
+    name: "thingamajig",
+    dependencies: [
+        .package(url: "https://github.com/tomasf/SwiftSCAD.git", .upToNextMinor(from: "0.8.1")),
+        <b><i>.package(url: "https://github.com/tomasf/RichText.git", from: "0.1.0")</i></b>
+    ],
+    targets: [
+        .executableTarget(name: "thingamajig", dependencies: ["SwiftSCAD", <b><i>"RichText"</i></b>])
+    ]
+)
+</pre>
diff --git a/Sources/RichText/Environment/Environment+FillRule.swift b/Sources/RichText/Environment/Environment+FillRule.swift
index b9951d1..1bbf791 100644
--- a/Sources/RichText/Environment/Environment+FillRule.swift
+++ b/Sources/RichText/Environment/Environment+FillRule.swift
@@ -1,11 +1,12 @@
 import Foundation
 import SwiftSCAD
-import QuartzCore
+@preconcurrency import QuartzCore
 
 extension CGPath {
     static internal let fillRuleEnvironmentKey: Environment.ValueKey = .init(rawValue: "CGPath.FillRule")
 }
 
+
 public extension Environment {
     var cgPathFillRule: CGPathFillRule {
         (self[CGPath.fillRuleEnvironmentKey] as? CGPathFillRule) ?? .evenOdd
diff --git a/Sources/RichText/Environment/Environment+RichText.swift b/Sources/RichText/Environment/Environment+RichText.swift
index cbb0625..34cae6e 100644
--- a/Sources/RichText/Environment/Environment+RichText.swift
+++ b/Sources/RichText/Environment/Environment+RichText.swift
@@ -46,7 +46,7 @@ public extension Geometry2D {
         withEnvironment { $0.withBaselineAlignment(alignment) }
     }
 
-    func usingTextAttribute<K: AttributedStringKey>(_ key: K.Type, value: K.Value?) -> any Geometry2D {
+    func usingTextAttribute<K: AttributedStringKey>(_ key: K.Type, value: K.Value?) -> any Geometry2D where K.Value: Sendable {
         withEnvironment { environment in
             var container = environment.textAttributeContainer
             container[K.self] = value
@@ -64,7 +64,7 @@ public extension Geometry3D {
         withEnvironment { $0.withBaselineAlignment(alignment) }
     }
 
-    func usingTextAttribute<K: AttributedStringKey>(_ key: K.Type, value: K.Value?) -> any Geometry3D {
+    func usingTextAttribute<K: AttributedStringKey>(_ key: K.Type, value: K.Value?) -> any Geometry3D where K.Value: Sendable {
         withEnvironment { environment in
             var container = environment.textAttributeContainer
             container[K.self] = value
diff --git a/Sources/RichText/Extensions/Geometry2D+CGPath.swift b/Sources/RichText/Extensions/Geometry2D+CGPath.swift
index af2963f..9c7cb3b 100644
--- a/Sources/RichText/Extensions/Geometry2D+CGPath.swift
+++ b/Sources/RichText/Extensions/Geometry2D+CGPath.swift
@@ -4,9 +4,9 @@ import QuartzCore
 
 extension QuartzCore.CGPath: SwiftSCAD.Shape2D {
     public var body: any Geometry2D {
-        EnvironmentReader { environment in
-            self.componentsSeparated(using: environment.cgPathFillRule).map { component in
-                let (positive, negatives) = component.normalizedPolygons(using: environment.cgPathFillRule)
+        readEnvironment(\.cgPathFillRule) { fillRule in
+            self.componentsSeparated(using: fillRule).map { component in
+                let (positive, negatives) = component.normalizedPolygons(using: fillRule)
                 return positive.subtracting { negatives }
             }
         }
diff --git a/Sources/RichText/RichText.swift b/Sources/RichText/RichText.swift
index 8b9ce51..80f849b 100644
--- a/Sources/RichText/RichText.swift
+++ b/Sources/RichText/RichText.swift
@@ -5,6 +5,9 @@ public struct RichText: Shape2D {
     internal let text: AttributedString
     internal let layout: Layout
 
+    @EnvironmentValue(\.self) var environment
+    @EnvironmentValue(\.textBoundaryType) var textBoundaryType
+
     public init(_ text: AttributedString, layout: Layout = .free) {
         self.text = text
         self.layout = layout
@@ -15,26 +18,23 @@ public struct RichText: Shape2D {
     }
 
     public var body: any Geometry2D {
-        EnvironmentReader { environment in
-            let lineFragments = lineFragments(in: environment)
+        let lineFragments = lineFragments(in: environment)
 
-            Union {
-                for fragment in lineFragments {
-                    for glyph in fragment.glyphs {
-                        glyph.shape.translated(glyph.location)
-                    }
-                }
-            }
-            .modifyingBounds { box in
-                environment.textBoundaryType == .shape ? box :
-                    .init(union: lineFragments.map(\.glyphBox))
+        lineFragments.map {
+            $0.glyphs.map { $0.shape.translated($0.location) }
+        }
+        .modifyingBounds { box in
+            if let box, textBoundaryType == .shape {
+                box
+            } else {
+                .init(union: lineFragments.map(\.glyphBox))
             }
-            .usingCGPathFillRule(.winding)
         }
+        .usingCGPathFillRule(.winding)
     }
 
     public func readingLineFragments(@UnionBuilder2D _ reader: @escaping ([LineFragment]) -> any Geometry2D) -> any Geometry2D {
-        EnvironmentReader { environment in
+        readEnvironment { environment in
             reader(lineFragments(in: environment))
                 .usingCGPathFillRule(.winding)
         }
@@ -73,12 +73,12 @@ public extension RichText {
         }
     }
 
-    enum BaselineAlignment {
+    enum BaselineAlignment: Sendable {
         case first
         case last
     }
 
-    enum BoundaryType {
+    enum BoundaryType: Sendable {
         case shape
         case lineFragments
     }