diff --git a/kb_python/report/report_matrix.ipynb b/kb_python/report/report_matrix.ipynb
index bd8ff86a..b12733a0 100644
--- a/kb_python/report/report_matrix.ipynb
+++ b/kb_python/report/report_matrix.ipynb
@@ -158,7 +158,7 @@
     "sc.pp.normalize_total(adata, target_sum=1e4)\n",
     "sc.pp.log1p(adata)\n",
     "pca = PCA(n_components=10)\n",
-    "pc = pca.fit_transform(adata.X.todense())"
+    "pc = pca.fit_transform(adata.X.toarray())"
    ]
   },
   {