diff --git a/requirements.txt b/requirements.txt
index 3049177233e..1e78050151d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
-Sphinx==1.1.3
+Sphinx==3.0.4
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability