diff --git a/requirements_dev.txt b/requirements_dev.txt
index 04109901..a3b05871 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.8.3
 tox==3.15.0
 coverage==5.0.4
-Sphinx==3.0.4
+Sphinx==3.2.1
 cryptography==2.8
 PyYAML==5.3.1
 pytest==5.3.5