diff --git a/poetry.lock b/poetry.lock
index d6ea1e4a1..cdd8121dd 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1224,15 +1224,15 @@ test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
 
 [[package]]
 name = "sphinx-rtd-theme"
-version = "1.0.0"
+version = "0.5.2"
 description = "Read the Docs theme for Sphinx"
 category = "main"
 optional = true
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = "*"
 
 [package.dependencies]
-docutils = "<0.18"
-sphinx = ">=1.6"
+docutils = "<0.17"
+sphinx = "*"
 
 [package.extras]
 dev = ["transifex-client", "sphinxcontrib-httpdomain", "bump2version"]
@@ -1413,7 +1413,7 @@ latex = ["ipython"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "39a83ee068b20b0df7b952f1b87ef3b2ff9779d8200746acf6e6512cb2fa964d"
+content-hash = "599a04a256f8490ddf3604405a4a118a711286452b347abab756a3a738a53e4f"
 
 [metadata.files]
 alabaster = [
@@ -2175,8 +2175,8 @@ sphinx = [
     {file = "Sphinx-4.0.2.tar.gz", hash = "sha256:b5c2ae4120bf00c799ba9b3699bc895816d272d120080fbc967292f29b52b48c"},
 ]
 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-0.5.2-py2.py3-none-any.whl", hash = "sha256:4a05bdbe8b1446d77a01e20a23ebc6777c74f43237035e76be89699308987d6f"},
+    {file = "sphinx_rtd_theme-0.5.2.tar.gz", hash = "sha256:32bd3b5d13dc8186d7a42fc816a23d32e83a4827d7d9882948e7b837c232da5a"},
 ]
 sphinxcontrib-applehelp = [
     {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
diff --git a/pyproject.toml b/pyproject.toml
index 50257b6d8..9737eb54e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ ipython = { version = "^7.21.0", optional = true }
 
 # docs extra
 Sphinx = { version = "^4.0.2", optional = true }
-sphinx-rtd-theme = { version = "^1.0.0", optional = true }
+sphinx-rtd-theme = { version = "^0.5.2", optional = true }
 nbsphinx = { version = "^0.8.6", optional = true }
 recommonmark = { version = "^0.7.1", optional = true }