diff --git a/ci/conda_env_sphinx.txt b/ci/conda_env_sphinx.txt
index 1274be50fde4a..22bb4fda06346 100644
--- a/ci/conda_env_sphinx.txt
+++ b/ci/conda_env_sphinx.txt
@@ -22,7 +22,7 @@ ipython
numpydoc
pydata-sphinx-theme==0.8
sphinx-design
-sphinx>=4.2
+sphinx>=4.2,<6
sphinx-copybutton
# Requirement for doctest-cython
pytest-cython
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 26f6cab0b3560..d447d0c38b67e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,5 +8,5 @@ numpydoc
pydata-sphinx-theme==0.8
sphinx-design
sphinx-copybutton
-sphinx>=4.2
+sphinx>=4.2,<6
pandas
diff --git a/docs/source/_templates/docs-sidebar.html b/docs/source/_templates/docs-sidebar.html
index 64aee59ed4e96..26d42a82f1d5c 100644
--- a/docs/source/_templates/docs-sidebar.html
+++ b/docs/source/_templates/docs-sidebar.html
@@ -1,6 +1,6 @@
-  }})
+ 