diff --git a/pyproject.toml b/pyproject.toml
index 7dc3385e733a54a12aac953f08725184bc587824..fd619bcde0520be89cd955c42fb830664d7a7026 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ mnemonic = "^0.19"
 pytest = "^6.2.5"
 pytest-cov = "^2.12.0"
 pytest-sugar = "^0.9.4"
-sphinx = "^3.2.1"
+sphinx = "^4.3.0"
 sphinx_rtd_theme = "^0.5.0"
 
 [tool.isort]