diff --git a/pyproject.toml b/pyproject.toml
index caf9c2b1..5c967134 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,6 +55,8 @@ docs = [
     "sphinx>=7,<9",
     "sphinx-rtd-theme~=2.0",
     "sphinx-book-theme~=1.0",
+    "sphinx-copybutton~=0.5",
+    "sphinx_design~=0.6",
 ]
 build = [
     "build~=1.2",