diff --git a/endpoints/users/update.post.py b/endpoints/users/update.post.py
new file mode 100644
index 0000000..521e6fa
--- /dev/null
+++ b/endpoints/users/update.post.py
@@ -0,0 +1,46 @@
+from fastapi import APIRouter, Depends, HTTPException
+from core.auth import get_current_user_dummy
+from core.database import fake_users_db
+
+router = APIRouter()
+
+@router.post("/users/update")
+async def update_profile(
+    current_user: dict = Depends(get_current_user_dummy),
+    username: str = None,
+    email: str = None,
+    bio: str = None
+):
+    """Update user profile information"""
+    if current_user["username"] not in fake_users_db:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    user_data = fake_users_db[current_user["username"]]
+    
+    if username and username != current_user["username"]:
+        if username in fake_users_db:
+            raise HTTPException(status_code=400, detail="Username already taken")
+        fake_users_db[username] = user_data
+        del fake_users_db[current_user["username"]]
+        current_user["username"] = username
+    
+    if email:
+        user_data["email"] = email
+    
+    if bio:
+        user_data["bio"] = bio
+    
+    return {
+        "message": "Profile updated successfully",
+        "user": {
+            "username": current_user["username"],
+            "email": user_data["email"],
+            "bio": user_data.get("bio", ""),
+        },
+        "metadata": {
+            "updated_fields": [
+                field for field in ["username", "email", "bio"]
+                if locals()[field] is not None
+            ]
+        }
+    }
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