diff --git a/1-Data-Cleaning.ipynb b/1-Data-Cleaning.ipynb
index 2689063..9600a52 100644
--- a/1-Data-Cleaning.ipynb
+++ b/1-Data-Cleaning.ipynb
@@ -284,9 +284,9 @@
     "def clean_text_round1(text):\n",
     "    '''Make text lowercase, remove text in square brackets, remove punctuation and remove words containing numbers.'''\n",
     "    text = text.lower()\n",
-    "    text = re.sub('\\[.*?\\]', '', text)\n",
-    "    text = re.sub('[%s]' % re.escape(string.punctuation), '', text)\n",
-    "    text = re.sub('\\w*\\d\\w*', '', text)\n",
+    "    text = re.sub(r'\\[.*?\\]', '', text)\n",
+    "    text = re.sub(r'[%s]' % re.escape(string.punctuation), '', text)\n",
+    "    text = re.sub(r'\\w*\\d\\w*', '', text)\n",
     "    return text\n",
     "\n",
     "round1 = lambda x: clean_text_round1(x)"
@@ -508,7 +508,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.2"
+   "version": "3.12.2"
   },
   "toc": {
    "nav_menu": {},