diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7c1ae69..8d7f8ed 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,11 +1,11 @@
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v5.0.0
+  rev: v6.0.0
   hooks:
   -   id: trailing-whitespace
   -   id: end-of-file-fixer
-- repo: https://github.com/psf/black
-  rev: 24.10.0
+- repo: https://github.com/psf/black-pre-commit-mirror
+  rev: 26.3.1
   hooks:
   -   id: black
 # - repo: https://github.com/kynan/nbstripout
diff --git a/book/notebooks/OM4_SE_animation.ipynb b/book/notebooks/OM4_SE_animation.ipynb
index d3aa6df..9dd7445 100644
--- a/book/notebooks/OM4_SE_animation.ipynb
+++ b/book/notebooks/OM4_SE_animation.ipynb
@@ -3202,6 +3202,7 @@
    "source": [
     "from matplotlib.animation import FuncAnimation, PillowWriter\n",
     "\n",
+    "\n",
     "def update_frame(i, plot_func, fig, len_idx):\n",
     "    # Clear the current figure to prepare for the next frame's plot.\n",
     "    plt.clf()\n",