diff --git a/004. recommender system basic with Python - 3 Matrix Factorization.ipynb b/004. recommender system basic with Python - 3 Matrix Factorization.ipynb
index 8f6cecf..60243a6 100644
--- a/004. recommender system basic with Python - 3 Matrix Factorization.ipynb	
+++ b/004. recommender system basic with Python - 3 Matrix Factorization.ipynb	
@@ -1464,7 +1464,7 @@
    "outputs": [],
    "source": [
     "# matrix는 pivot_table 값을 numpy matrix로 만든 것 \n",
-    "matrix = df_user_movie_ratings.as_matrix()\n",
+    "matrix = df_user_movie_ratings.values\n",
     "\n",
     "# user_ratings_mean은 사용자의 평균 평점 \n",
     "user_ratings_mean = np.mean(matrix, axis = 1)\n",