diff --git a/pyproject.toml b/pyproject.toml
index d55d181..d751697 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ include = [
 
 [tool.poetry.dependencies]
 python = "^3.6.1"
-Sphinx = "^4.0.2"
+Sphinx = "^6.0.0"
 
 [tool.poetry.dev-dependencies]
 coverage = "^5.4"