diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3494b80f..bb97d86d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
 alabaster==0.7.12
-Sphinx==3.4.3
+Sphinx==3.5.1
 sphinx-rtd-theme==0.5.1