diff --git a/setup.py b/setup.py
index 4208d9e..c08b4dc 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
         "flask-sqlalchemy",
         "marshmallow-sqlalchemy>=0.24.0",
     ],
-    "docs": ["marshmallow-sqlalchemy>=0.13.0", "Sphinx==3.4.1", "sphinx-issues==1.2.0"],
+    "docs": ["marshmallow-sqlalchemy>=0.13.0", "Sphinx==3.4.3", "sphinx-issues==1.2.0"],
     "lint": [
         "flake8==3.8.4",
         "flake8-bugbear==20.11.1",