diff --git a/pyproject.toml b/pyproject.toml
index 71a13c5..c4013b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ test = [
     "pytest",
     "pytest-cov",
     "pre-commit",
-    "sphinx==4.2.0",
+    "sphinx==6.1.2",
     "myst-parser==0.15.2",
     "sphinx_rtd_theme",
     "nbformat >=4.2.0", # for Jupyter Notebook in VS Code
diff --git a/requirements.txt b/requirements.txt
index b563a45..03f4802 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,5 +9,5 @@ scipy==1.8.0
 seaborn==0.11.2
 torch==1.11.0
 myst-parser==0.17.0
-sphinx==4.4.0
+sphinx==6.1.2
 sphinx-copybutton==0.5.0