diff --git a/requirements/test.txt b/requirements/test.txt
index 379b22be..313cb5e3 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -57,7 +57,7 @@ pytz==2019.2              # via babel
 pyyaml==5.1
 requests==2.22.0          # via sphinx
 snowballstemmer==2.0.0    # via pydocstyle, sphinx
-sphinx==1.8.2
+sphinx==2.3.1
 sphinxcontrib-websupport==1.1.2  # via sphinx
 testtools==2.3.0          # via fixtures
 toml==0.10.0              # via tox