diff --git a/src/userbase-js/types/index.d.ts b/src/userbase-js/types/index.d.ts
index aa5f0318..f6efb2de 100644
--- a/src/userbase-js/types/index.d.ts
+++ b/src/userbase-js/types/index.d.ts
@@ -128,16 +128,25 @@ export type databaseNameXorIdXorShareToken = (
 
 export type priceIdXorPlanId = ({ priceId?: string, planId?: never } | { planId?: string, priceId?: never });
 
+export type PasswordHashAlgo = (
+  passwordArrayBuffer: Uint8Array,
+  salt: Uint8Array,
+  N: number,
+  r: number,
+  p: number,
+  dkLen: number
+) => Promise<Uint8Array>;
+
 export interface Userbase {
   init(params: { appId: string, updateUserHandler?: UpdateUserHandler, sessionLength?: number, allowServerSideEncryption?: boolean }): Promise<Session>
 
-  signUp(params: { username: string, password: string, email?: string, profile?: UserProfile, rememberMe?: RememberMeOption, sessionLength?: number }): Promise<UserResult>
+  signUp(params: { username: string, password: string, email?: string, profile?: UserProfile, rememberMe?: RememberMeOption, sessionLength?: number, passwordHashAlgo?: PasswordHashAlgo }): Promise<UserResult>
 
-  signIn(params: { username: string, password: string, rememberMe?: RememberMeOption, sessionLength?: number }): Promise<UserResult>
+  signIn(params: { username: string, password: string, rememberMe?: RememberMeOption, sessionLength?: number, passwordHashAlgo?: PasswordHashAlgo }): Promise<UserResult>
 
   signOut(): Promise<void>
 
-  updateUser(params: { username?: string, currentPassword?: string, newPassword?: string, email?: string | null | false | undefined, profile?: UserProfile | null | false | undefined }): Promise<void>
+  updateUser(params: { username?: string, currentPassword?: string, newPassword?: string, email?: string | null | false | undefined, profile?: UserProfile | null | false | undefined, passwordHashAlgo?: PasswordHashAlgo }): Promise<void>
 
   deleteUser(): Promise<void>
 
diff --git a/src/userbase-js/types/test.ts b/src/userbase-js/types/test.ts
index ea1cc107..6807a23d 100644
--- a/src/userbase-js/types/test.ts
+++ b/src/userbase-js/types/test.ts
@@ -26,6 +26,17 @@ const {
   updatePaymentMethod,
 } = userbase
 
+const dummyPasswordHashAlgo = (
+  passwordArrayBuffer: Uint8Array,
+  salt: Uint8Array,
+  N: number,
+  r: number,
+  p: number,
+  dkLen: number
+) => {
+  return Promise.resolve(new Uint8Array(0));
+};
+
 // TypeScript Version: 2.1
 
 // $ExpectType Promise<Session>
@@ -61,6 +72,9 @@ signUp({ username: 'tuser', password: 'tpass', email: 'test@test.com', profile:
 // $ExpectType Promise<UserResult>
 signUp({ username: 'tuser', password: 'tpass', email: 'test@test.com', profile: { tkey: 'tval' }, rememberMe: 'none' })
 
+// $ExpectType Promise<UserResult>
+signUp({ username: 'tuser', password: 'tpass', email: 'test@test.com', profile: { tkey: 'tval' }, rememberMe: 'none', passwordHashAlgo: dummyPasswordHashAlgo })
+
 // $ExpectError
 signUp({ username: 'tuser', password: 'tpass', email: 'test@test.com', profile: { tkey: {} } })
 
@@ -82,6 +96,9 @@ signIn({ username: 'tuser', password: 'tpass' })
 // $ExpectType Promise<UserResult>
 signIn({ username: 'tuser', password: 'tpass', rememberMe: 'session' })
 
+// $ExpectType Promise<UserResult>
+signIn({ username: 'tuser', password: 'tpass', rememberMe: 'session', passwordHashAlgo: dummyPasswordHashAlgo })
+
 // $ExpectError
 signIn({ username: 'tuser' })
 
@@ -103,6 +120,9 @@ updateUser({ username: 'tusernew' })
 // $ExpectType Promise<void>
 updateUser({ currentPassword: 'tpasscurrent', newPassword: 'tpassnew' })
 
+// $ExpectType Promise<void>
+updateUser({ currentPassword: 'tpasscurrent', newPassword: 'tpassnew', passwordHashAlgo: dummyPasswordHashAlgo })
+
 // $ExpectType Promise<void>
 updateUser({ email: 'testnew@test.com' })