diff --git a/requirements/CI/requirements.txt b/requirements/CI/requirements.txt
index 9f7a2384f..a60b43262 100644
--- a/requirements/CI/requirements.txt
+++ b/requirements/CI/requirements.txt
@@ -3,7 +3,7 @@ coverage==5.3
 flake8==3.8.4
 nose==1.3.7
 setuptools-scm==4.1.2
-sphinx==3.3.0
+sphinx==3.3.1
 sphinx-argparse==0.2.5
 sphinx-issues==1.2.0
 sphinx_rtd_theme==0.5.0