diff --git a/poetry.lock b/poetry.lock
index 12167293..8620dd5f 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -719,18 +719,18 @@ rtd = ["ipython", "myst-nb", "sphinx", "sphinx-book-theme"]
 
 [[package]]
 name = "sphinx-rtd-theme"
-version = "1.0.0"
+version = "1.1.1"
 description = "Read the Docs theme for Sphinx"
 category = "dev"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
 docutils = "<0.18"
-sphinx = ">=1.6"
+sphinx = ">=1.6,<6"
 
 [package.extras]
-dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client"]
+dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client", "wheel"]
 
 [[package]]
 name = "sphinxcontrib-applehelp"
@@ -894,7 +894,7 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "65417aafbf9a170397273ce4842e500701741041d45344bb628102953327fe12"
+content-hash = "910dd6ea4dafbe1d5ece066b9a6cfc2ee1fa5a49f120434198779732f60e5e76"
 
 [metadata.files]
 alabaster = [
@@ -1385,8 +1385,8 @@ sphinx-copybutton = [
     {file = "sphinx_copybutton-0.5.0-py3-none-any.whl", hash = "sha256:9684dec7434bd73f0eea58dda93f9bb879d24bff2d8b187b1f2ec08dfe7b5f48"},
 ]
 sphinx-rtd-theme = [
-    {file = "sphinx_rtd_theme-1.0.0-py2.py3-none-any.whl", hash = "sha256:4d35a56f4508cfee4c4fb604373ede6feae2a306731d533f409ef5c3496fdbd8"},
-    {file = "sphinx_rtd_theme-1.0.0.tar.gz", hash = "sha256:eec6d497e4c2195fa0e8b2016b337532b8a699a68bcb22a512870e16925c6a5c"},
+    {file = "sphinx_rtd_theme-1.1.1-py2.py3-none-any.whl", hash = "sha256:31faa07d3e97c8955637fc3f1423a5ab2c44b74b8cc558a51498c202ce5cbda7"},
+    {file = "sphinx_rtd_theme-1.1.1.tar.gz", hash = "sha256:6146c845f1e1947b3c3dd4432c28998a1693ccc742b4f9ad7c63129f0757c103"},
 ]
 sphinxcontrib-applehelp = [
     {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
diff --git a/pyproject.toml b/pyproject.toml
index a78ff63d..bcfe354a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ ECPy = "^1.2.5"
 
 [tool.poetry.dev-dependencies]
 Sphinx = "^4.3.2"
-sphinx-rtd-theme = "^1.0.0"
+sphinx-rtd-theme = "^1.1.1"
 pytest = "^7.2.0"
 pytest-cov = "^4.0.0"
 flake8 = "^5.0.4"