diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d4bd22f..dfb6c26 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,7 +15,7 @@ jobs:
       - name: Set up Swift
         uses: swift-actions/setup-swift@3aed395c5397f62deb91d8fe7af1418a9ae4d16f # v2.1.0
         with:
-          swift-version: "5.10.0"
+          swift-version: "6.0.2"
 
       - name: Checkout
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
diff --git a/.swift-version b/.swift-version
index 509b0b6..9b9a244 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-5.10.0
+6.0.2
diff --git a/Package.swift b/Package.swift
index 7b9e4b3..824cef9 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.10
+// swift-tools-version: 6.0
 
 import PackageDescription
 
diff --git a/Sources/ComicSans/ComicSans.swift b/Sources/ComicSans/ComicSans.swift
index 3fa022c..3531b5d 100644
--- a/Sources/ComicSans/ComicSans.swift
+++ b/Sources/ComicSans/ComicSans.swift
@@ -69,7 +69,7 @@ public struct ComicSans {
         return result.isEmpty ? nil : result
     }
 
-    @MainActor public func pngRepresentation(scale: Int = 2) -> Data? {
+    @MainActor public func pngRepresentation(scale: Int = 2) async -> Data? {
         let renderer = ImageRenderer(content: view)
         renderer.scale = CGFloat(scale)
 
diff --git a/Sources/CommandLineTool/cs.swift b/Sources/CommandLineTool/cs.swift
index aa76e3a..a7916a5 100644
--- a/Sources/CommandLineTool/cs.swift
+++ b/Sources/CommandLineTool/cs.swift
@@ -57,7 +57,7 @@ struct CommandLineTool: ParsableCommand {
         }
     }
 
-    @MainActor mutating func run() throws {
+    @MainActor mutating func run() async throws {
         let text = try isExpectingPipe ? parsePipeInput() : text
 
         let result = ComicSans(
@@ -72,7 +72,7 @@ struct CommandLineTool: ParsableCommand {
             fileExtension: "png"
         )
 
-        guard let pngData = result.pngRepresentation() else {
+        guard let pngData = await result.pngRepresentation() else {
             throw ExitCode.failure
         }