diff --git a/Sources/Authentication/Basic/BasicAuthenticatable.swift b/Sources/Authentication/Basic/BasicAuthenticatable.swift
index 060b7eb..432bef0 100644
--- a/Sources/Authentication/Basic/BasicAuthenticatable.swift
+++ b/Sources/Authentication/Basic/BasicAuthenticatable.swift
@@ -5,14 +5,14 @@ import Fluent
 /// Authenticatable by `Basic username:password` auth.
 public protocol BasicAuthenticatable: Authenticatable {
     /// Key path to the username
-    typealias UsernameKey = ReferenceWritableKeyPath<Self, String>
+    typealias UsernameKey = WritableKeyPath<Self, String>
 
     /// The key under which the user's username,
     /// email, or other identifing value is stored.
     static var usernameKey: UsernameKey { get }
 
     /// Key path to the password
-    typealias PasswordKey = ReferenceWritableKeyPath<Self, String>
+    typealias PasswordKey = WritableKeyPath<Self, String>
 
     /// The key under which the user's password
     /// is stored.
diff --git a/Sources/Authentication/Bearer/BearerAuthenticatable.swift b/Sources/Authentication/Bearer/BearerAuthenticatable.swift
index 9d2bedc..e6db1ac 100644
--- a/Sources/Authentication/Bearer/BearerAuthenticatable.swift
+++ b/Sources/Authentication/Bearer/BearerAuthenticatable.swift
@@ -5,7 +5,7 @@ import Fluent
 /// Authenticatable by `Bearer token` auth.
 public protocol BearerAuthenticatable: Authenticatable {
     /// Key path to the token
-    typealias TokenKey = ReferenceWritableKeyPath<Self, String>
+    typealias TokenKey = WritableKeyPath<Self, String>
 
     /// The key under which the model's unique token is stored.
     static var tokenKey: TokenKey { get }
diff --git a/Sources/Authentication/TokenAuthenticatable.swift b/Sources/Authentication/TokenAuthenticatable.swift
index 987268c..ea7df31 100644
--- a/Sources/Authentication/TokenAuthenticatable.swift
+++ b/Sources/Authentication/TokenAuthenticatable.swift
@@ -17,7 +17,7 @@ public protocol Token: BearerAuthenticatable {
         where UserType.Database == Database
 
     /// A relation to the user that owns this token.
-    static var userIDKey: ReferenceWritableKeyPath<Self, UserType.ID> { get }
+    static var userIDKey: WritableKeyPath<Self, UserType.ID> { get }
 }
 
 extension TokenAuthenticatable {
diff --git a/Tests/AuthenticationTests/User.swift b/Tests/AuthenticationTests/User.swift
index 6005440..299be41 100644
--- a/Tests/AuthenticationTests/User.swift
+++ b/Tests/AuthenticationTests/User.swift
@@ -14,8 +14,8 @@ final class User: Model, Migration, BasicAuthenticatable {
     typealias ID = UUID
     
     static let idKey: IDKey = \User.id
-    static let usernameKey = \User.email
-    static let passwordKey = \User.password
+    static let usernameKey: UsernameKey = \User.email
+    static let passwordKey: PasswordKey = \User.password
 
     var id: UUID?
     var name: String