diff --git a/pyproject.toml b/pyproject.toml
index cc4c2a4..ae18949 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,7 @@ doc = [
     # For notebooks
     "ipykernel",
     "sphinx-copybutton",
+    "ipython==8.4.0"
 ]
 test = [
     "pytest",