diff --git a/src/lib/supabase.ts b/src/lib/supabase.ts
index 74f18082..f5de169e 100644
--- a/src/lib/supabase.ts
+++ b/src/lib/supabase.ts
@@ -1,4 +1,4 @@
-import { createClient } from '@supabase/supabase-js'
+import { createClient, Session } from '@supabase/supabase-js'
 
 const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
 const supabaseAnonKey = import.meta.env.VITE_SUPABASE_ANON_KEY
@@ -61,6 +61,6 @@ export const getCurrentUser = async () => {
   return user
 }
 
-export const onAuthStateChange = (callback: (event: string, session: any) => void) => {
+export const onAuthStateChange = (callback: (event: string, session: Session | null) => void) => {
   return supabase.auth.onAuthStateChange(callback)
 }
\ No newline at end of file