diff --git a/pyproject.toml b/pyproject.toml
index b8adc00..e4462e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ docs = [
     "sphinx-autodoc-typehints>=1,<2",
     "ipython>=8,<9",
     "asteroid-sphinx-theme==0.0.3",
-    "sphinx_rtd_theme>1.2,<2",
+    "sphinx_rtd_theme>1.2,<4",
     "enum-tools[sphinx]>=0.13,<0.14",
     "traitlets",
     "pickleshare"
diff --git a/requirements.txt b/requirements.txt
index 6d8df01..49fc19d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -433,7 +433,7 @@ sphinx-jinja2-compat==0.4.1
     #   sphinx-toolbox
 sphinx-prompt==1.5.0
     # via sphinx-toolbox
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==3.0.2
     # via baec (pyproject.toml)
 sphinx-tabs==3.4.5
     # via sphinx-toolbox