diff --git a/Sources/Compatibility.swift b/Sources/Compatibility.swift
index e1255af..692edfe 100644
--- a/Sources/Compatibility.swift
+++ b/Sources/Compatibility.swift
@@ -5,11 +5,28 @@
 //  Created by Ben Ku on 7/5/24.
 //
 
+#if compiler(>=6.0) && canImport(Synchronization)
+import Synchronization
+private let colorLoggingState = Mutex(false)
+#endif
 
 public extension DebugLevel {
-    /// Set this to `true` to log failed color parsing notices when returning `nil`
-    @MainActor
+    /// Set this to `true` to log failed color parsing notices when returning `nil`.
+    ///
+    /// Swift 6 uses `Synchronization.Mutex` so synchronous color parsing can read this
+    /// configuration from any actor without making the parsing APIs MainActor-isolated.
+#if compiler(>=6.0) && canImport(Synchronization)
+    static var colorLogging: Bool {
+        get { colorLoggingState.withLock { $0 } }
+        set { colorLoggingState.withLock { $0 = newValue } }
+    }
+#elseif compiler(>=6.0)
+    // Compatibility fallback for Swift 6 toolchains that do not ship Synchronization.
+    // Current supported Swift 6 toolchains use the mutex-backed implementation above.
+    nonisolated(unsafe) static var colorLogging = false
+#else
     static var colorLogging = false
+#endif
 
     // TODO: Change this to generic type matching protocol instead of boxed any type?
     @available(iOS 13, tvOS 13, watchOS 6, *)