diff --git a/Package.swift b/Package.swift
index 92d6bb5..7db5ad3 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:4.0
+// swift-tools-version:4.2
 import PackageDescription
 
 let package = Package(
diff --git a/Sources/CountedSet/CountedSet.swift b/Sources/CountedSet/CountedSet.swift
index 9e932c8..3590f7d 100644
--- a/Sources/CountedSet/CountedSet.swift
+++ b/Sources/CountedSet/CountedSet.swift
@@ -237,16 +237,8 @@ extension CountedSet: CustomStringConvertible, CustomDebugStringConvertible {
 }
 
 extension CountedSet : Hashable {
-    public var hashValue: Int {
-        var hash = 5381
-        
-        for (element, count) in backingDictionary {
-            for _ in 1...count {
-                hash = ((hash << 5) &+ hash) &+ element.hashValue
-            }
-        }
-        
-        return hash
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(backingDictionary)
     }
 }