1 files changed, 1 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index e0c4edc2..3368d88d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -58,6 +58,7 @@ testing =
     pip>=19.1 # For proper file:// URLs support.
     jaraco.envs
     pytest-xdist
+    sphinx
 
 docs =
     # Keep these in sync with docs/requirements.txt