diff --git a/Sources/tart/DiskImageFormat.swift b/Sources/tart/DiskImageFormat.swift
index 36b6641..7ebd268 100644
--- a/Sources/tart/DiskImageFormat.swift
+++ b/Sources/tart/DiskImageFormat.swift
@@ -21,7 +21,7 @@ enum DiskImageFormat: String, CaseIterable, Codable {
     case .raw:
       return true
     case .asif:
-      if #available(macOS 15, *) {
+      if #available(macOS 26, *) {
         return true
       } else {
         return false
diff --git a/Tests/TartTests/DiskImageFormatTests.swift b/Tests/TartTests/DiskImageFormatTests.swift
index bc78a4d..a4e59a9 100644
--- a/Tests/TartTests/DiskImageFormatTests.swift
+++ b/Tests/TartTests/DiskImageFormatTests.swift
@@ -2,13 +2,9 @@ import XCTest
 @testable import tart
 
 final class DiskImageFormatTests: XCTestCase {
-  func testRawFormatIsAlwaysSupported() throws {
-    XCTAssertTrue(DiskImageFormat.raw.isSupported)
-  }
-
   func testASIFFormatSupport() throws {
-    // ASIF should be supported on macOS 15+
-    if #available(macOS 15, *) {
+    // ASIF should be supported on macOS 26+
+    if #available(macOS 26, *) {
       XCTAssertTrue(DiskImageFormat.asif.isSupported)
     } else {
       XCTAssertFalse(DiskImageFormat.asif.isSupported)