diff --git a/doc/changes/changes_3.1.0.md b/doc/changes/changes_3.1.0.md
index 1fecf6be..3fdf45a9 100644
--- a/doc/changes/changes_3.1.0.md
+++ b/doc/changes/changes_3.1.0.md
@@ -4,3 +4,10 @@
 
 * #324 Used pytest-plugins in notebook tests.
 
+## Bug Fixes
+
+* #326
+  - Scikit-learn notebook: call model's fit and predict with numpy arrays;
+  - Ibis notebook: added a link to this notebook on the front page;
+  - Configuration: added internal bucket-fs host name and port;
+  - Upgraded jupyterlab to 4.2.5.
diff --git a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/jupyter_requirements.txt b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/jupyter_requirements.txt
index 015b370d..52278e38 100644
--- a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/jupyter_requirements.txt
+++ b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/jupyter_requirements.txt
@@ -1,2 +1,2 @@
-jupyterlab==4.1.1
+jupyterlab==4.2.5
 pexpect==4.8.0
diff --git a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_predict_udf.ipynb b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_predict_udf.ipynb
index a0e0f190..3f09a01c 100644
--- a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_predict_udf.ipynb
+++ b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_predict_udf.ipynb
@@ -93,7 +93,7 @@
     "        # Call the model to get the predictions. Omit the first column in the input\n",
     "        # which holds the sample IDs.\n",
     "        df_features = X_pred.drop(X_pred.columns[0], axis=1)\n",
-    "        y_pred = model.predict(df_features)\n",
+    "        y_pred = model.predict(df_features.values)\n",
     "\n",
     "        # Combine predictions with the sample IDs.\n",
     "        df_rowid = X_pred[X_pred.columns[0]].reset_index(drop=True)\n",
diff --git a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_train_telescope.ipynb b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_train_telescope.ipynb
index 636eaac0..645f024e 100644
--- a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_train_telescope.ipynb
+++ b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/sklearn/sklearn_train_telescope.ipynb
@@ -91,7 +91,7 @@
     "\n",
     "# Create and train the model.\n",
     "model = tree.DecisionTreeClassifier()\n",
-    "model.fit(X_train.values, y_train)\n",
+    "model.fit(X_train.values, y_train.values)\n",
     "\n",
     "print(f\"Training took: {stopwatch}\")"
    ]
@@ -118,7 +118,7 @@
     "import matplotlib.pyplot as plt\n",
     "\n",
     "# Make the predictions on the validation set.\n",
-    "y_pred = model.predict(X_valid)\n",
+    "y_pred = model.predict(X_valid.values)\n",
     "\n",
     "# Build and display the confusion matrix.\n",
     "cm = confusion_matrix(y_valid, y_pred, labels=model.classes_)\n",
diff --git a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/start.ipynb b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/start.ipynb
index e9696091..d391af3c 100644
--- a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/start.ipynb
+++ b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/start.ipynb
@@ -41,6 +41,7 @@
     "1. [Transformers extension](transformers/te_introduction.ipynb)\n",
     "1. [Cloud store](cloud/01_import_data.ipynb)\n",
     "1. [Script Languages Container](script_languages_container/using_the_script_languages_container_tool.ipynb)\n",
+    "1. [Using IBIS dataframe library](ibis/quickstart.ipynb)\n",
     "\n"
    ]
   }
diff --git a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/utils/main_config_ui.ipynb b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/utils/main_config_ui.ipynb
index ab4ef1b4..05f20d71 100644
--- a/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/utils/main_config_ui.ipynb
+++ b/exasol/ds/sandbox/runtime/ansible/roles/jupyter/files/notebook/utils/main_config_ui.ipynb
@@ -104,7 +104,7 @@
     "\n",
     "    inputs = [\n",
     "        [\n",
-    "            ('Host Name', widgets.Text(value=conf.get(CKey.db_host_name, '127.0.0.1')), CKey.db_host_name),\n",
+    "            ('Host Name', widgets.Text(value=conf.get(CKey.db_host_name, 'localhost')), CKey.db_host_name),\n",
     "            ('Port', widgets.IntText(value=int(conf.get(CKey.db_port, '8563'))), CKey.db_port),\n",
     "            ('User Name', widgets.Text(value=conf.get(CKey.db_user)), CKey.db_user),\n",
     "            ('Password', widgets.Password(value=conf.get(CKey.db_password)), CKey.db_password),\n",
@@ -113,8 +113,10 @@
     "                CKey.db_encryption)\n",
     "        ],\n",
     "        [\n",
-    "            ('Host Name', widgets.Text(value=conf.get(CKey.bfs_host_name, '127.0.0.1')), CKey.bfs_host_name),\n",
-    "            ('Port', widgets.IntText(value=int(conf.get(CKey.bfs_port, '2580'))), CKey.bfs_port),\n",
+    "            ('External Host Name', widgets.Text(value=conf.get(CKey.bfs_host_name, 'localhost')), CKey.bfs_host_name),\n",
+    "            ('Internal Host Name', widgets.Text(value=conf.get(CKey.bfs_host_name, 'localhost')), CKey.bfs_internal_host_name),\n",
+    "            ('External Port', widgets.IntText(value=int(conf.get(CKey.bfs_port, '2580'))), CKey.bfs_port),\n",
+    "            ('Internal Port', widgets.IntText(value=int(conf.get(CKey.bfs_port, '2580'))), CKey.bfs_internal_port),\n",
     "            ('User Name', widgets.Text(value=conf.get(CKey.bfs_user)), CKey.bfs_user),\n",
     "            ('Password', widgets.Password(value=conf.get(CKey.bfs_password)), CKey.bfs_password),\n",
     "            ('Service Name', widgets.Text(value=conf.get(CKey.bfs_service, 'bfsdefault')), CKey.bfs_service),\n",