diff --git a/.changeset/cold-singers-bow.md b/.changeset/cold-singers-bow.md
new file mode 100644
index 00000000..55f310e5
--- /dev/null
+++ b/.changeset/cold-singers-bow.md
@@ -0,0 +1,5 @@
+---
+'@hono/auth-js': patch
+---
+
+Update @auth/core version and set default basePath
diff --git a/packages/auth-js/package.json b/packages/auth-js/package.json
index 5486b0ef..e12719c1 100644
--- a/packages/auth-js/package.json
+++ b/packages/auth-js/package.json
@@ -57,7 +57,7 @@
     "react": ">=18"
   },
   "devDependencies": {
-    "@auth/core": "^0.19.0",
+    "@auth/core": "^0.24.0",
     "@types/react": "^18",
     "hono": "^3.11.7",
     "jest": "^29.7.0",
diff --git a/packages/auth-js/src/index.ts b/packages/auth-js/src/index.ts
index f015bdee..889f87ff 100644
--- a/packages/auth-js/src/index.ts
+++ b/packages/auth-js/src/index.ts
@@ -35,6 +35,7 @@ function reqWithEnvUrl(req: Request, authUrl?: string): Request {
 
 function setEnvDefaults(env: AuthEnv, config: AuthConfig) {
   config.secret ??= env.AUTH_SECRET
+  config.basePath ??= '/api/auth'
   config.trustHost = true
   config.redirectProxyUrl ??= env.AUTH_REDIRECT_PROXY_URL
   config.providers = config.providers.map((p) => {
@@ -53,13 +54,12 @@ function setEnvDefaults(env: AuthEnv, config: AuthConfig) {
 
 export async function getAuthUser(c: Context): Promise<AuthUser | null> {
   const config = c.get('authConfig')
+  setEnvDefaults(c.env, config)
   const origin = new URL(c.req.url, c.env.AUTH_URL).origin
-  const request = new Request(`${origin}/session`, {
+  const request = new Request(`${origin}${config.basePath}/session`, {
     headers: { cookie: c.req.header('cookie') ?? '' },
   })
 
-  setEnvDefaults(c.env, config)
-
   let authUser: AuthUser = {} as AuthUser
 
   const response = (await Auth(request, {
@@ -70,7 +70,6 @@ export async function getAuthUser(c: Context): Promise<AuthUser | null> {
         authUser = args[0]
         const session =
           (await config.callbacks?.session?.(...args)) ?? args[0].session
-        // @ts-expect-error either user or token will be defined
         const user = args[0].user ?? args[0].token
         return { user, ...session } satisfies Session
       },
diff --git a/yarn.lock b/yarn.lock
index 0cc44537..41340f3b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -45,9 +45,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@auth/core@npm:^0.19.0":
-  version: 0.19.0
-  resolution: "@auth/core@npm:0.19.0"
+"@auth/core@npm:^0.24.0":
+  version: 0.24.0
+  resolution: "@auth/core@npm:0.24.0"
   dependencies:
     "@panva/hkdf": "npm:^1.1.1"
     "@types/cookie": "npm:0.6.0"
@@ -61,7 +61,7 @@ __metadata:
   peerDependenciesMeta:
     nodemailer:
       optional: true
-  checksum: 27fc81a2e4348fb6a44ded8137001908c4dfbe0fd0375b1479f50d9ea5be73b5fad20f4338c0e3df1eac4200b3831a7a57cfb79fdcad5a2ce1ce04ff76ad9190
+  checksum: b8d8c66bc35d18a6ffa80e21b122747cb0c40826f68eb8c22a1b4dda01aba62c2050a1d5e4997e92a6756edad4103faafe8d9a49c7278d991e690c3ebbdb6035
   languageName: node
   linkType: hard
 
@@ -1364,7 +1364,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@hono/auth-js@workspace:packages/auth-js"
   dependencies:
-    "@auth/core": "npm:^0.19.0"
+    "@auth/core": "npm:^0.24.0"
     "@types/react": "npm:^18"
     hono: "npm:^3.11.7"
     jest: "npm:^29.7.0"