diff --git a/notebooks/rfpimp-collinear.ipynb b/notebooks/rfpimp-collinear.ipynb
index 1a0688e..2e5fa52 100644
--- a/notebooks/rfpimp-collinear.ipynb
+++ b/notebooks/rfpimp-collinear.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -20,7 +20,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -34,7 +34,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -56,7 +56,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
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@@ -90,8 +90,8 @@
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@@ -392,7 +392,7 @@
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@@ -694,7 +694,7 @@
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@@ -744,7 +744,7 @@
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@@ -1273,13 +1273,13 @@
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+   "execution_count": 7,
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        " </defs>\n",
        "</svg>\n"
       ],
       "text/plain": [
-       "<rfpimp.PimpViz at 0x12b82d090>"
+       "<rfpimp.PimpViz at 0x129714050>"
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      },
-     "execution_count": 8,
+     "execution_count": 7,
      "metadata": {},
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@@ -3587,7 +3561,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
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+       "       <path d=\"M 50.984375 -16.609375 \n",
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@@ -6663,13 +6709,13 @@
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        "     </g>\n",
        "    </g>\n",
-       "    <g id=\"ytick_4\">\n",
-       "     <g id=\"line2d_7\">\n",
+       "    <g id=\"ytick_5\">\n",
+       "     <g id=\"line2d_8\">\n",
        "      <g>\n",
-       "       <use style=\"stroke:#000000;stroke-width:0.8;\" x=\"118.473438\" xlink:href=\"#m1a282b9b86\" y=\"51.452933\"/>\n",
+       "       <use style=\"stroke:#000000;stroke-width:0.8;\" x=\"118.473438\" xlink:href=\"#m44e3b579ab\" y=\"67.337504\"/>\n",
        "      </g>\n",
        "     </g>\n",
-       "     <g id=\"text_7\">\n",
+       "     <g id=\"text_8\">\n",
        "      <!-- price_to_median_beds -->\n",
        "      <defs>\n",
        "       <path d=\"M 52 44.1875 \n",
@@ -6703,7 +6749,7 @@
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@@ -6727,31 +6773,14 @@
        "      </g>\n",
        "     </g>\n",
        "    </g>\n",
-       "    <g id=\"ytick_5\">\n",
-       "     <g id=\"line2d_8\">\n",
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-       "      </g>\n",
-       "     </g>\n",
-       "     <g id=\"text_8\">\n",
-       "      <!-- price -->\n",
-       "      <g style=\"fill:#444443;\" transform=\"translate(86.584375 71.136723)scale(0.1 -0.1)\">\n",
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+       "       <use style=\"stroke:#000000;stroke-width:0.8;\" x=\"118.473438\" xlink:href=\"#m44e3b579ab\" y=\"83.222076\"/>\n",
        "      </g>\n",
        "     </g>\n",
        "     <g id=\"text_9\">\n",
-       "      <!-- bathrooms -->\n",
+       "      <!-- beds_baths -->\n",
        "      <defs>\n",
        "       <path d=\"M 54.890625 33.015625 \n",
        "L 54.890625 0 \n",
@@ -6773,7 +6802,29 @@
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+       "      </g>\n",
+       "     </g>\n",
+       "     <g id=\"text_10\">\n",
+       "      <!-- bathrooms -->\n",
+       "      <g style=\"fill:#444443;\" transform=\"translate(57.44375 102.905866)scale(0.1 -0.1)\">\n",
        "       <use xlink:href=\"#DejaVuSans-98\"/>\n",
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@@ -6786,15 +6837,15 @@
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        "     </g>\n",
        "    </g>\n",
-       "    <g id=\"ytick_7\">\n",
-       "     <g id=\"line2d_10\">\n",
+       "    <g id=\"ytick_8\">\n",
+       "     <g id=\"line2d_11\">\n",
        "      <g>\n",
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        "      </g>\n",
        "     </g>\n",
-       "     <g id=\"text_10\">\n",
+       "     <g id=\"text_11\">\n",
        "      <!-- bedrooms -->\n",
-       "      <g style=\"fill:#444443;\" transform=\"translate(61.328125 102.905866)scale(0.1 -0.1)\">\n",
+       "      <g style=\"fill:#444443;\" transform=\"translate(61.328125 118.790437)scale(0.1 -0.1)\">\n",
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@@ -6806,28 +6857,6 @@
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-       "      </g>\n",
-       "     </g>\n",
-       "     <g id=\"text_11\">\n",
-       "      <!-- beds_baths -->\n",
-       "      <g style=\"fill:#444443;\" transform=\"translate(54.470312 118.790437)scale(0.1 -0.1)\">\n",
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        "   </g>\n",
        "   <g id=\"patch_11\">\n",
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@@ -6852,17 +6881,17 @@
        "  </g>\n",
        " </g>\n",
        " <defs>\n",
-       "  <clipPath id=\"p249e0b1523\">\n",
+       "  <clipPath id=\"pda110216b9\">\n",
        "   <rect height=\"111.192\" width=\"137.025\" x=\"118.473438\" y=\"3.799219\"/>\n",
        "  </clipPath>\n",
        " </defs>\n",
        "</svg>\n"
       ],
       "text/plain": [
-       "<rfpimp.PimpViz at 0x12a5d6a90>"
+       "<rfpimp.PimpViz at 0x1298b81d0>"
       ]
      },
-     "execution_count": 13,
+     "execution_count": 11,
      "metadata": {},
      "output_type": "execute_result"
     }
diff --git a/src/rfpimp.py b/src/rfpimp.py
index 6a2d2cd..387571d 100644
--- a/src/rfpimp.py
+++ b/src/rfpimp.py
@@ -10,9 +10,10 @@
 import pandas as pd
 import numpy as np
 import matplotlib.pyplot as plt
+import sklearn
 from sklearn.ensemble import RandomForestClassifier
 from sklearn.ensemble import RandomForestRegressor
-from sklearn.ensemble.forest import _generate_unsampled_indices, _get_n_samples_bootstrap
+from sklearn.ensemble.forest import _generate_unsampled_indices
 from sklearn.ensemble import forest
 from sklearn.model_selection import cross_val_score
 from sklearn.base import clone
@@ -415,13 +416,14 @@ def _get_unsampled_indices(tree, n_samples):
     """
     An interface to get unsampled indices regardless of sklearn version.
     """
-    try:  # Version 0.21 or older uses only two arguments.
-        return _generate_unsampled_indices(tree.random_state, n_samples)
-    except TypeError:  # Version 0.22 or newer uses only two arguments.
+    if sklearn.__version__.startswith("0.22"):
+        # Version 0.22 or newer uses 3 arguments.
+        from sklearn.ensemble.forest import _get_n_samples_bootstrap
         n_samples_bootstrap = _get_n_samples_bootstrap(n_samples, n_samples)
-        return _generate_unsampled_indices(
-            tree.random_state, n_samples, n_samples_bootstrap
-        )
+        return _generate_unsampled_indices(tree.random_state, n_samples, n_samples_bootstrap)
+    else:
+        # Version 0.21 or older uses only two arguments.
+        return _generate_unsampled_indices(tree.random_state, n_samples)
 
 
 def oob_classifier_accuracy(rf, X_train, y_train):