diff --git a/requirements.txt b/requirements.txt
index 0171a73a..d0760bb1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ MarkupSafe==0.23
 PasteDeploy==1.5.2
 PyYAML==3.11
 Pygments==2.0.2
-Sphinx==1.3.1
+Sphinx==3.3.0
 WebOb==1.4.1
 WebTest==2.0.18
 beautifulsoup4==4.3.2