diff --git a/book/requirements.txt b/book/requirements.txt
index ca3dfec..65347b0 100644
--- a/book/requirements.txt
+++ b/book/requirements.txt
@@ -102,6 +102,10 @@ docutils==0.18.1
     #   sphinxcontrib-bibtex
 email-validator==2.0.0.post2
     # via fastapi
+exceptiongroup==1.2.0
+    # via
+    #   cattrs
+    #   pytest
 executing==1.2.0
     # via stack-data
 fastapi[all]==0.95.2
@@ -284,7 +288,7 @@ numpy==1.24.3
     #   numba
     #   pandas
     #   scipy
-orjson==3.8.13
+orjson==3.9.15
     # via fastapi
 overrides==7.4.0
     # via jupyter-server
@@ -495,6 +499,10 @@ terminado==0.17.1
     #   jupyter-server-terminals
 tinycss2==1.2.1
     # via nbconvert
+tomli==2.0.1
+    # via
+    #   jupyterlab
+    #   pytest
 toolz==0.12.0
     # via altair
 tornado==6.3.3
@@ -522,6 +530,7 @@ traitlets==5.9.0
     #   nbformat
 typing-extensions==4.6.1
     # via
+    #   altair
     #   async-lru
     #   myst-nb
     #   myst-parser
diff --git a/lectures/pandas/PublicAPIs.ipynb b/lectures/pandas/PublicAPIs.ipynb
index 1c80de7..65b02ac 100644
--- a/lectures/pandas/PublicAPIs.ipynb
+++ b/lectures/pandas/PublicAPIs.ipynb
@@ -3320,9 +3320,9 @@
    "source": [
     "url = \"https://api.met.no/weatherapi/locationforecast/2.0/compact?lat=51.5&lon=0\"\n",
     "s = requests.Session()\n",
-    "s.headers[\n",
-    "    \"User-Agent\"\n",
-    "] = \"uio-in3110 https://github.com/uio-in3110/uio-in3110.github.io\"\n",
+    "s.headers[\"User-Agent\"] = (\n",
+    "    \"uio-in3110 https://github.com/uio-in3110/uio-in3110.github.io\"\n",
+    ")\n",
     "r = s.get(url)\n",
     "r"
    ]
diff --git a/lectures/production/from-script-to-project/monty-hall-game4/monty_hall_game/__main__.py b/lectures/production/from-script-to-project/monty-hall-game4/monty_hall_game/__main__.py
index 27d14a7..9ae637f 100644
--- a/lectures/production/from-script-to-project/monty-hall-game4/monty_hall_game/__main__.py
+++ b/lectures/production/from-script-to-project/monty-hall-game4/monty_hall_game/__main__.py
@@ -1,4 +1,4 @@
 from .cli import main
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/lectures/python/exercises.ipynb b/lectures/python/exercises.ipynb
index 0bc0490..a26d0c0 100644
--- a/lectures/python/exercises.ipynb
+++ b/lectures/python/exercises.ipynb
@@ -404,8 +404,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "class Square(...):\n",
-    "    ...\n",
+    "class Square(...): ...\n",
     "\n",
     "\n",
     "sq = Square(5)\n",