diff --git a/environment.yml b/environment.yml
index c0b1c23..b91ed9e 100644
--- a/environment.yml
+++ b/environment.yml
@@ -16,7 +16,7 @@ dependencies:
 - nc-time-axis
 - pip
 - pytest
-- python>=3.8
+- python<=3.11
 - tqdm
 - watermark
 - xarray>=2023.4.2
diff --git a/notebooks/plot-diagnostics.ipynb b/notebooks/plot-diagnostics.ipynb
index 2325af5..7626705 100644
--- a/notebooks/plot-diagnostics.ipynb
+++ b/notebooks/plot-diagnostics.ipynb
@@ -351,7 +351,6 @@
    "outputs": [],
    "source": [
     "# Produce a catalog content summary.\n",
-    "import pprint\n",
     "\n",
     "uniques = col.unique()\n",
     "\n",
@@ -595,8 +594,8 @@
     "        data_slice = ds[data_var].sel(member_id=mem_id)\n",
     "        \n",
     "        if truncate_data:\n",
-    "            # Limit time range to three years.\n",
-    "            data_slice = truncateData(data_slice, 3)\n",
+    "            # Limit time range to one year.\n",
+    "            data_slice = truncateData(data_slice, 1)\n",
     "\n",
     "        # Save slice in memory to prevent repeated disk loads\n",
     "        data_slice = data_slice.persist()\n",
@@ -633,7 +632,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 33,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -656,8 +655,8 @@
     "        data_slice = ds[data_var].sel(member_id=mem_id)\n",
     "        \n",
     "        if truncate_data:\n",
-    "            # Limit time range to three years.\n",
-    "            data_slice = truncateData(data_slice, 3)\n",
+    "            # Limit time range to one year.\n",
+    "            data_slice = truncateData(data_slice, 1)\n",
     "\n",
     "        # Save slice in memory to prevent repeated disk loads\n",
     "        data_slice = data_slice.persist()\n",