diff --git a/CHANGELOG.md b/CHANGELOG.md
index 901b891..71a4792 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 ### Changes
 
 ### Fixes
+* Add missing sphinx-rtd-theme documentation dependencies
 
 ### Breaks
 
diff --git a/pyproject.toml b/pyproject.toml
index 03c86bb..aeb7d21 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,6 +39,7 @@ optional = true
 [tool.poetry.group.sphinx.dependencies]
 sphinx = ">=5"
 sphinx-autodoc-typehints = ">=1.17"
+sphinx-rtd-theme = "*"
 
 [build-system]
 requires = ["poetry-core>=1.4.0"]