diff --git a/poetry.lock b/poetry.lock
index 049eb839..7bc9d3c5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2687,22 +2687,22 @@ test = ["pytest", "pytest-cov"]
 
 [[package]]
 name = "sphinx-rtd-theme"
-version = "2.0.0"
+version = "3.0.0"
 description = "Read the Docs theme for Sphinx"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.8"
 files = [
-    {file = "sphinx_rtd_theme-2.0.0-py2.py3-none-any.whl", hash = "sha256:ec93d0856dc280cf3aee9a4c9807c60e027c7f7b461b77aeffed682e68f0e586"},
-    {file = "sphinx_rtd_theme-2.0.0.tar.gz", hash = "sha256:bd5d7b80622406762073a04ef8fadc5f9151261563d47027de09910ce03afe6b"},
+    {file = "sphinx_rtd_theme-3.0.0-py2.py3-none-any.whl", hash = "sha256:1ffe1539957775bfa0a7331370de7dc145b6eac705de23365dc55c5d94bb08e7"},
+    {file = "sphinx_rtd_theme-3.0.0.tar.gz", hash = "sha256:905d67de03217fd3d76fbbdd992034ac8e77044ef8063a544dda1af74d409e08"},
 ]
 
 [package.dependencies]
-docutils = "<0.21"
-sphinx = ">=5,<8"
+docutils = ">0.18,<0.22"
+sphinx = ">=6,<9"
 sphinxcontrib-jquery = ">=4,<5"
 
 [package.extras]
-dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client", "wheel"]
+dev = ["bump2version", "transifex-client", "twine", "wheel"]
 
 [[package]]
 name = "sphinxcontrib-applehelp"
@@ -2983,4 +2983,4 @@ gel = ["matplotlib", "pillow", "scipy", "scipy"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8,<4.0"
-content-hash = "9aae277679824830bbfccfd27f7b36ddefe875a95ff87bc3b652754c6370108b"
+content-hash = "80d73ccaf1fb05703f74505a6a4660bc8f74c4ca83f60669fd75acb2edfe669f"
diff --git a/pyproject.toml b/pyproject.toml
index 101f6d1a..572d2a76 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -82,7 +82,7 @@ requests-mock = ">=1.10.0"
 [tool.poetry.group.docs.dependencies]
 numpydoc = "^1.6.0"
 sphinx-autobuild = "^2021.3.14"
-sphinx-rtd-theme = ">=1.3,<3.0"
+sphinx-rtd-theme = ">=1.3,<4.0"
 
 
 [tool.poetry.group.dev.dependencies]