diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7fb67fe..90bc945 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,5 +1,5 @@
 flake8==3.8.1
-Sphinx==3.0.3
+Sphinx==3.2.1
 sphinx_rtd_theme==0.4.3
 tox==3.15.0
 pytest==5.4.2